Version 5.1.0

Bumps [coverage](https://github.com/coveragepy/coveragepy) from 7.15.0 to 7.15.2.
- [Release notes](https://github.com/coveragepy/coveragepy/releases)
- [Changelog](https://github.com/coveragepy/coveragepy/blob/main/CHANGES.rst)
- [Commits](https://github.com/coveragepy/coveragepy/compare/7.15.0...7.15.2)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.15.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build-release.yml

@@ -11,7 +11,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7

.github/workflows/ci.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
@@ -15,7 +18,7 @@ jobs:
     name: Lint (Ruff)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -36,7 +39,7 @@ jobs:
     name: Type Check (ty)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -74,7 +77,7 @@ jobs:
           --health-retries 5
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -93,7 +96,7 @@ jobs:
 
       - name: Upload coverage to Codecov
         if: matrix.python-version == '3.14'
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v7
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           report_type: coverage
@@ -102,7 +105,7 @@ jobs:
 
       - name: Upload test results to Codecov
         if: matrix.python-version == '3.14'
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v7
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           report_type: test_results

.github/workflows/docs.yml

@@ -5,20 +5,15 @@ on:
     types: [published]
 
 permissions:
-  contents: read
-  pages: write
-  id-token: write
+  contents: write
 
 jobs:
   deploy:
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/configure-pages@v5
-
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
+        with:
+          fetch-depth: 0
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -28,11 +23,31 @@ jobs:
 
       - run: uv sync --group dev
 
-      - run: uv run zensical build --clean
+      - name: Configure git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
 
-      - uses: actions/upload-pages-artifact@v4
-        with:
-          path: site
+      - name: Deploy documentation
+        run: |
+          VERSION=${GITHUB_REF_NAME#v}
+          MAJOR=$(echo "$VERSION" | cut -d. -f1)
+          DEPLOY_VERSION="v$(echo "$VERSION" | cut -d. -f1-2)"
 
-      - uses: actions/deploy-pages@v4
-        id: deployment
+          # On new major: keep only the latest feature version of the previous major
+          PREV_MAJOR=$((MAJOR - 1))
+          OLD_FEATURE_VERSIONS=$(uv run mike list 2>/dev/null | grep -oE "^v${PREV_MAJOR}\.[0-9]+" || true)
+
+          if [ -n "$OLD_FEATURE_VERSIONS" ]; then
+            LATEST_PREV=$(echo "$OLD_FEATURE_VERSIONS" | sort -t. -k2 -n | tail -1)
+            echo "$OLD_FEATURE_VERSIONS" | while read -r OLD_V; do
+              if [ "$OLD_V" != "$LATEST_PREV" ]; then
+                echo "Deleting $OLD_V"
+                uv run mike delete "$OLD_V"
+              fi
+            done
+          fi
+
+          uv run mike deploy --update-aliases "$DEPLOY_VERSION" stable
+          uv run mike set-default stable
+          git push origin gh-pages

.pre-commit-config.yaml

@@ -0,0 +1,34 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+    - repo: https://github.com/pre-commit/pre-commit-hooks
+      rev: v6.0.0
+      hooks:
+          - id: check-added-large-files
+            args: ["--maxkb=750"]
+            exclude: ^uv.lock$
+          - id: end-of-file-fixer
+          - id: trailing-whitespace
+
+    - repo: local
+      hooks:
+          - id: local-ruff-check
+            name: ruff check
+            entry: uv run ruff check --force-exclude --fix --exit-non-zero-on-fix .
+            require_serial: true
+            language: unsupported
+            types: [python]
+
+          - id: local-ruff-format
+            name: ruff format
+            entry: uv run ruff format --force-exclude --exit-non-zero-on-format .
+            require_serial: true
+            language: unsupported
+            types: [python]
+
+          - id: local-ty
+            name: ty check
+            entry: uv run ty check
+            require_serial: true
+            language: unsupported
+            pass_filenames: false

README.md

@@ -48,7 +48,8 @@ uv add "fastapi-toolsets[all]"
 - **Database**: Session management, transaction helpers, table locking, and polling-based row change detection
 - **Dependencies**: FastAPI dependency factories (`PathDependency`, `BodyDependency`) for automatic DB lookups from path or body parameters
 - **Fixtures**: Fixture system with dependency management, context support, and pytest integration
-- **Model Mixins**: SQLAlchemy mixins for common column patterns (`UUIDMixin`, `UUIDv7Mixin`, `CreatedAtMixin`, `UpdatedAtMixin`, `TimestampMixin`) and lifecycle callbacks (`WatchedFieldsMixin`, `@watch`) that fire after commit for insert, update, and delete events
+- **Model Mixins**: SQLAlchemy mixins for common column patterns (`UUIDMixin`, `UUIDv7Mixin`, `CreatedAtMixin`, `UpdatedAtMixin`, `TimestampMixin`)
+- **Lifecycle Events**: Post-commit event system (`EventSession`, `listens_for`) that dispatches async/sync callbacks for insert, update, and delete operations
 - **Standardized API Responses**: Consistent response format with `Response`, `ErrorResponse`, `PaginatedResponse`, `CursorPaginatedResponse` and `OffsetPaginatedResponse`.
 - **Exception Handling**: Structured error responses with automatic OpenAPI documentation
 - **Logging**: Logging configuration with uvicorn integration via `configure_logging` and `get_logger`

docs/examples/pagination-search.md

@@ -43,16 +43,16 @@ Declare `searchable_fields`, `facet_fields`, and `order_fields` once on [`CrudFa
 
 ## Routes
 
-```python title="routes.py:1:17"
---8<-- "docs_src/examples/pagination_search/routes.py:1:17"
+```python title="routes.py:1:16"
+--8<-- "docs_src/examples/pagination_search/routes.py:1:16"
 ```
 
 ### Offset pagination
 
 Best for admin panels or any UI that needs a total item count and numbered pages.
 
-```python title="routes.py:20:40"
---8<-- "docs_src/examples/pagination_search/routes.py:20:40"
+```python title="routes.py:19:37"
+--8<-- "docs_src/examples/pagination_search/routes.py:19:37"
 ```
 
 **Example request**
@@ -72,6 +72,7 @@ GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&or
   ],
   "pagination": {
     "total_count": 42,
+    "pages": 5,
     "page": 2,
     "items_per_page": 10,
     "has_more": true
@@ -85,12 +86,14 @@ GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&or
 
 `filter_attributes` always reflects the values visible **after** applying the active filters. Use it to populate filter dropdowns on the client.
 
+To skip the `COUNT(*)` query for better performance on large tables, pass `include_total=False`. `pagination.total_count` will be `null` in the response, while `has_more` remains accurate.
+
 ### Cursor pagination
 
 Best for feeds, infinite scroll, or any high-throughput API where offset performance degrades.
 
-```python title="routes.py:43:63"
---8<-- "docs_src/examples/pagination_search/routes.py:43:63"
+```python title="routes.py:40:58"
+--8<-- "docs_src/examples/pagination_search/routes.py:40:58"
 ```
 
 **Example request**
@@ -127,10 +130,10 @@ Pass `next_cursor` as the `cursor` query parameter on the next request to advanc
 
 !!! info "Added in `v2.3.0`"
 
-[`paginate()`](../module/crud.md#unified-paginate--both-strategies-on-one-endpoint) lets a single endpoint support both strategies via a `pagination_type` query parameter. The `pagination_type` field in the response acts as a discriminator for frontend tooling.
+[`paginate()`](../module/crud.md#unified-endpoint-both-strategies) lets a single endpoint support both strategies via a `pagination_type` query parameter. The `pagination_type` field in the response acts as a discriminator for frontend tooling.
 
-```python title="routes.py:66:90"
---8<-- "docs_src/examples/pagination_search/routes.py:66:90"
+```python title="routes.py:61:79"
+--8<-- "docs_src/examples/pagination_search/routes.py:61:79"
 ```
 
 **Offset request** (default)
@@ -144,7 +147,7 @@ GET /articles/?pagination_type=offset&page=1&items_per_page=10
   "status": "SUCCESS",
   "pagination_type": "offset",
   "data": ["..."],
-  "pagination": { "total_count": 42, "page": 1, "items_per_page": 10, "has_more": true }
+  "pagination": { "total_count": 42, "pages": 5, "page": 1, "items_per_page": 10, "has_more": true }
 }
 ```
 

docs/index.md

@@ -48,7 +48,8 @@ uv add "fastapi-toolsets[all]"
 - **Database**: Session management, transaction helpers, table locking, and polling-based row change detection
 - **Dependencies**: FastAPI dependency factories (`PathDependency`, `BodyDependency`) for automatic DB lookups from path or body parameters
 - **Fixtures**: Fixture system with dependency management, context support, and pytest integration
-- **Model Mixins**: SQLAlchemy mixins for common column patterns (`UUIDMixin`, `UUIDv7Mixin`, `CreatedAtMixin`, `UpdatedAtMixin`, `TimestampMixin`) and lifecycle callbacks (`WatchedFieldsMixin`) that fire after commit for insert, update, and delete events.
+- **Model Mixins**: SQLAlchemy mixins for common column patterns (`UUIDMixin`, `UUIDv7Mixin`, `CreatedAtMixin`, `UpdatedAtMixin`, `TimestampMixin`).
+- **Lifecycle Events**: Post-commit event system (`EventSession`, `listens_for`) that dispatches async/sync callbacks for insert, update, and delete operations.
 - **Standardized API Responses**: Consistent response format with `Response`, `ErrorResponse`, `PaginatedResponse`, `CursorPaginatedResponse` and `OffsetPaginatedResponse`.
 - **Exception Handling**: Structured error responses with automatic OpenAPI documentation
 - **Logging**: Logging configuration with uvicorn integration via `configure_logging` and `get_logger`

docs/migration/v2.md

@@ -85,13 +85,17 @@ The `paginate` shorthand was an alias for `offset_paginate`. It has been removed
 === "Before (`v1`)"
 
     ```python
-    result = await UserCrud.paginate(session=session, page=2, items_per_page=20, schema=UserRead)
+    result = await UserCrud.paginate(
+        session=session, page=2, items_per_page=20, schema=UserRead
+    )
     ```
 
 === "Now (`v2`)"
 
     ```python
-    result = await UserCrud.offset_paginate(session=session, page=2, items_per_page=20, schema=UserRead)
+    result = await UserCrud.offset_paginate(
+        session=session, page=2, items_per_page=20, schema=UserRead
+    )
     ```
 
 ---
@@ -124,8 +128,11 @@ For shared base classes that are not meant to be raised directly, use `abstract=
 class BillingError(ApiException, abstract=True):
     """Base for all billing-related errors — not raised directly."""
 
+
 class PaymentRequiredError(BillingError):
-    api_error = ApiError(code=402, msg="Payment Required", desc="...", err_code="BILLING-402")
+    api_error = ApiError(
+        code=402, msg="Payment Required", desc="...", err_code="BILLING-402"
+    )
 ```
 
 ---

docs/migration/v3.md

@@ -0,0 +1,191 @@
+# Migrating to v3.0
+
+This page covers every breaking change introduced in **v3.0** and the steps required to update your code.
+
+---
+
+## CRUD
+
+### Facet keys now always use the full relationship chain
+
+In `v2`, relationship facet fields used only the terminal column key (e.g. `"name"` for `Role.name`) and only prepended the relationship name when two facet fields shared the same column key. In `v3`, facet keys **always** include the full relationship chain joined by `__`, regardless of collisions.
+
+=== "Before (`v2`)"
+
+    ```
+    User.status -> status
+    (User.role, Role.name) -> name
+    (User.role, Role.permission, Permission.name) -> name
+    ```
+
+=== "Now (`v3`)"
+
+    ```
+    User.status -> status
+    (User.role, Role.name) -> role__name
+    (User.role, Role.permission, Permission.name) -> role__permission__name
+    ```
+
+---
+
+### `*_params` dependencies consolidated into per-paginate methods
+
+The six individual dependency methods (`offset_params`, `cursor_params`, `paginate_params`, `filter_params`, `search_params`, `order_params`) have been **removed** and replaced by three consolidated methods that bundle pagination, search, filter, and order into a single `Depends()` call.
+
+| Removed | Replacement |
+|---|---|
+| `offset_params()` + `filter_params()` + `search_params()` + `order_params()` | `offset_paginate_params()` |
+| `cursor_params()` + `filter_params()` + `search_params()` + `order_params()` | `cursor_paginate_params()` |
+| `paginate_params()` + `filter_params()` + `search_params()` + `order_params()` | `paginate_params()` |
+
+Each new method accepts `search`, `filter`, and `order` boolean toggles (all `True` by default) to disable features you don't need.
+
+=== "Before (`v2`)"
+
+    ```python
+    from fastapi_toolsets.crud import OrderByClause
+
+
+    @router.get("/offset")
+    async def list_articles_offset(
+        session: SessionDep,
+        params: Annotated[dict, Depends(ArticleCrud.offset_params(default_page_size=20))],
+        filter_by: Annotated[dict, Depends(ArticleCrud.filter_params())],
+        order_by: Annotated[
+            OrderByClause | None,
+            Depends(ArticleCrud.order_params(default_field=Article.created_at)),
+        ],
+        search: str | None = None,
+    ) -> OffsetPaginatedResponse[ArticleRead]:
+        return await ArticleCrud.offset_paginate(
+            session=session,
+            **params,
+            search=search,
+            filter_by=filter_by or None,
+            order_by=order_by,
+            schema=ArticleRead,
+        )
+    ```
+
+=== "Now (`v3`)"
+
+    ```python
+    @router.get("/offset")
+    async def list_articles_offset(
+        session: SessionDep,
+        params: Annotated[
+            dict,
+            Depends(
+                ArticleCrud.offset_paginate_params(
+                    default_page_size=20,
+                    default_order_field=Article.created_at,
+                )
+            ),
+        ],
+    ) -> OffsetPaginatedResponse[ArticleRead]:
+        return await ArticleCrud.offset_paginate(
+            session=session, **params, schema=ArticleRead
+        )
+    ```
+
+The same pattern applies to `cursor_paginate_params()` and `paginate_params()`. To disable a feature, pass the toggle:
+
+```python
+# No search or ordering, only pagination + filtering
+ArticleCrud.offset_paginate_params(search=False, order=False)
+```
+
+---
+
+## Models
+
+The lifecycle event system has been rewritten. Callbacks are now registered with a module-level [`listens_for`](../reference/models.md#fastapi_toolsets.models.listens_for) decorator and dispatched by [`EventSession`](../reference/models.md#fastapi_toolsets.models.EventSession), replacing the mixin-based approach from `v2`.
+
+### `WatchedFieldsMixin` and `@watch` removed
+
+Importing `WatchedFieldsMixin` or `watch` will raise `ImportError`.
+
+Model method callbacks (`on_create`, `on_delete`, `on_update`) and the `@watch` decorator are replaced by:
+
+1. **`__watched_fields__`** — a plain class attribute to restrict which field changes trigger `UPDATE` events (replaces `@watch`).
+2. **`@listens_for`** — a module-level decorator to register callbacks for one or more [`ModelEvent`](../reference/models.md#fastapi_toolsets.models.ModelEvent) types (replaces `on_create` / `on_delete` / `on_update` methods).
+
+=== "Before (`v2`)"
+
+    ```python
+    from fastapi_toolsets.models import WatchedFieldsMixin, watch
+
+
+    @watch("status")
+    class Order(Base, UUIDMixin, WatchedFieldsMixin):
+        __tablename__ = "orders"
+
+        status: Mapped[str]
+
+        async def on_create(self):
+            await notify_new_order(self.id)
+
+        async def on_update(self, changes):
+            if "status" in changes:
+                await notify_status_change(self.id, changes["status"])
+
+        async def on_delete(self):
+            await notify_order_cancelled(self.id)
+    ```
+
+=== "Now (`v3`)"
+
+    ```python
+    from fastapi_toolsets.models import ModelEvent, UUIDMixin, listens_for
+
+
+    class Order(Base, UUIDMixin):
+        __tablename__ = "orders"
+        __watched_fields__ = ("status",)
+
+        status: Mapped[str]
+
+
+    @listens_for(Order, [ModelEvent.CREATE])
+    async def on_order_created(order: Order, event_type: ModelEvent, changes: None):
+        await notify_new_order(order.id)
+
+
+    @listens_for(Order, [ModelEvent.UPDATE])
+    async def on_order_updated(order: Order, event_type: ModelEvent, changes: dict):
+        if "status" in changes:
+            await notify_status_change(order.id, changes["status"])
+
+
+    @listens_for(Order, [ModelEvent.DELETE])
+    async def on_order_deleted(order: Order, event_type: ModelEvent, changes: None):
+        await notify_order_cancelled(order.id)
+    ```
+
+### `EventSession` now required
+
+Without `EventSession`, lifecycle callbacks will silently stop firing.
+
+Callbacks are now dispatched inside `EventSession.commit()` rather than via background tasks. Pass it as the session class when creating your session factory:
+
+=== "Before (`v2`)"
+
+    ```python
+    from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+
+    engine = create_async_engine("postgresql+asyncpg://...")
+    SessionLocal = async_sessionmaker(engine, expire_on_commit=False)
+    ```
+
+=== "Now (`v3`)"
+
+    ```python
+    from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+    from fastapi_toolsets.models import EventSession
+
+    engine = create_async_engine("postgresql+asyncpg://...")
+    SessionLocal = async_sessionmaker(engine, expire_on_commit=False, class_=EventSession)
+    ```
+
+!!! note
+    If you use `create_db_session` from `fastapi_toolsets.pytest`, the session already uses `EventSession` — no changes needed in tests.

docs/migration/v4.md

@@ -0,0 +1,42 @@
+# Migrating to v4.0
+
+This page covers every breaking change introduced in **v4.0** and the steps required to update your code.
+
+---
+
+## Database
+
+### `lock_tables` now takes a `session_maker` instead of a `session`
+
+The first argument of `lock_tables` changed from an `AsyncSession` instance to an `async_sessionmaker`.
+The function creates and manages its own **dedicated session** internally, yielding it to the caller.
+
+=== "Before (`v3`)"
+
+    ```python
+    from fastapi_toolsets.db import lock_tables, LockMode
+
+    async with lock_tables(session=session, tables=[User, Account]):
+        user = await UserCrud.get(session, [User.id == 1])
+        user.balance += 100
+
+    # With a custom lock mode
+    async with lock_tables(session=session, tables=[Order], mode=LockMode.EXCLUSIVE):
+        await process_order(session, order_id)
+    ```
+
+=== "Now (`v4`)"
+
+    ```python
+    from fastapi_toolsets.db import lock_tables, LockMode
+
+    async with lock_tables(session_maker=session_maker, tables=[User, Account]) as session:
+        user = await UserCrud.get(session, [User.id == 1])
+        user.balance += 100
+
+    # With a custom lock mode
+    async with lock_tables(
+        session_maker=session_maker, tables=[Order], mode=LockMode.EXCLUSIVE
+    ) as session:
+        await process_order(session, order_id)
+    ```

docs/migration/v5.md

@@ -0,0 +1,166 @@
+# Migrating to v5.0
+
+This page covers every breaking change introduced in **v5.0** and the steps required to update your code.
+
+---
+
+## Database
+
+`db.py` is now the `db/` package, built around one object, [`Database`](../reference/db.md#fastapi_toolsets.db.Database), that owns the engine and sessionmaker. The free functions that took a `session_maker` you built and passed around yourself are gone from request-handling code; `Database` builds the sessionmaker for you.
+
+### `create_db_dependency` / `create_db_context` removed in favor of `Database`
+
+Build one `Database` with your URL (or an existing `engine=`), then use the instance directly as the FastAPI dependency, and `db.session()` for sessions outside request handlers.
+
+=== "Before (`v4`)"
+
+    ```python
+    from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
+    from fastapi_toolsets.db import create_db_dependency, create_db_context
+
+    engine = create_async_engine("postgresql+asyncpg://...")
+    SessionLocal = async_sessionmaker(engine, expire_on_commit=False)
+
+    get_db = create_db_dependency(session_maker=SessionLocal)
+    get_db_context = create_db_context(session_maker=SessionLocal)
+
+
+    @app.get("/users")
+    async def list_users(session: AsyncSession = Depends(get_db)): ...
+
+
+    async def seed():
+        async with get_db_context() as session:
+            ...
+    ```
+
+=== "Now (`v5`)"
+
+    ```python
+    from fastapi_toolsets.db import Database
+
+    db = Database(url="postgresql+asyncpg://...")
+
+
+    @app.get("/users")
+    async def list_users(session: AsyncSession = Depends(db)): ...
+
+
+    async def seed():
+        async with db.session() as session:
+            ...
+    ```
+
+Call `db.install(app)` to also commit before the response is sent (instead of in dependency teardown) and to dispose the engine on shutdown. See [the db module docs](../module/db.md#committing-before-the-response).
+
+### `get_transaction` renamed to `transaction`
+
+Same behavior (savepoint when already in a transaction, new transaction otherwise), new name, same import path.
+
+=== "Before (`v4`)"
+
+    ```python
+    from fastapi_toolsets.db import get_transaction
+
+    async with get_transaction(session=session):
+        session.add(model)
+    ```
+
+=== "Now (`v5`)"
+
+    ```python
+    from fastapi_toolsets.db import transaction
+
+    async with transaction(session=session):
+        session.add(model)
+    ```
+
+If you have a `Database` instance, `db.begin()` opens a session already inside a transaction:
+
+```python
+async with db.begin() as session:
+    session.add(User(name="ada"))
+```
+
+### `lock_tables` is now also a `Database` method
+
+The free `lock_tables(session_maker, tables, ...)` function still exists for callers who manage their own session factory, but prefer `db.lock_tables(tables, ...)`, which drops the `session_maker` argument:
+
+=== "Before (`v4`)"
+
+    ```python
+    from fastapi_toolsets.db import lock_tables, LockMode
+
+    async with lock_tables(
+        session_maker=session_maker, tables=[Order], mode=LockMode.EXCLUSIVE
+    ) as session:
+        await process_order(session, order_id)
+    ```
+
+=== "Now (`v5`)"
+
+    ```python
+    from fastapi_toolsets.db import LockMode
+
+    async with db.lock_tables(tables=[Order], mode=LockMode.EXCLUSIVE) as session:
+        await process_order(session, order_id)
+    ```
+
+### `create_database` and `cleanup_tables` moved to `fastapi_toolsets.db.testing`
+
+=== "Before (`v4`)"
+
+    ```python
+    from fastapi_toolsets.db import create_database, cleanup_tables
+    ```
+
+=== "Now (`v5`)"
+
+    ```python
+    from fastapi_toolsets.db.testing import create_database, cleanup_tables
+    ```
+
+## Fixtures
+
+### `get_obj_by_attr` / `get_field_by_attr` are now `FixtureRegistry` methods
+
+Both also change their first argument: instead of the fixture *function*, pass the fixture's *registered name* and let the registry look it up.
+
+=== "Before (`v4`)"
+
+    ```python
+    from fastapi_toolsets.fixtures import get_obj_by_attr, get_field_by_attr
+
+
+    @fixtures.register(depends_on=["roles"])
+    def users():
+        admin_role = get_obj_by_attr(fixtures=roles, attr_name="name", value="admin")
+        admin_role_id = get_field_by_attr(fixtures=roles, attr_name="name", value="admin")
+        return [User(id=1, username="alice", role_id=admin_role.id)]
+    ```
+
+=== "Now (`v5`)"
+
+    ```python
+    @fixtures.register(depends_on=["roles"])
+    def users():
+        admin_role = fixtures.obj(name="roles", attr_name="name", value="admin")
+        admin_role_id = fixtures.field(name="roles", attr_name="name", value="admin")
+        return [User(id=1, username="alice", role_id=admin_role.id)]
+    ```
+
+### Loading/listing by context now always includes `Context.BASE`
+
+`FixtureRegistry.get_variants`/`get_by_context`, `load_fixtures_by_context`, and the `fixtures list`/`fixtures load` CLI commands now implicitly union every queried context with `Context.BASE`. In `v4`, requesting a single context (e.g. `"testing"`) returned only fixtures tagged with that context; in `v5` it also returns every `Context.BASE`-tagged fixture.
+
+If you relied on strict exclusion of base fixtures, move them out of `Context.BASE` into their own context.
+
+### `load_fixtures` / `load_fixtures_by_context` now return reloaded instances
+
+Loaded objects are re-queried from the database after insert, with all relationships eager-loaded, instead of returning the exact objects your fixture function constructed. Code that compares returned objects by identity to the fixture function's output, or that expected relationships to remain unloaded, should be updated — and expect one extra query per model type per load.
+
+## Security
+
+The security module has been removed and moved to a dedicated python package: [`fastapi-multiauth`](https://github.com/d3vyce/fastapi-multiauth).
+
+Run `uv add fastapi-multiauth` and replace `from fastapi_toolsets.security import ...` with `from fastapi_multiauth import ...`.

docs/module/cli.md

@@ -24,7 +24,7 @@ Configure the CLI in your `pyproject.toml`:
 
 ```toml
 [tool.fastapi-toolsets]
-cli = "myapp.cli:cli"                   # Custom Typer app
+custom_cli = "myapp.cli:cli"                   # Custom Typer app
 fixtures = "myapp.fixtures:registry"    # FixtureRegistry instance
 db_context = "myapp.db:db_context"      # Async context manager for sessions
 ```
@@ -68,6 +68,20 @@ manager fixtures --help
 ╰──────────────────────────────────────────────────────────────────────────────────╯
 ```
 
+### `fixtures load`
+
+```bash
+manager fixtures load [CONTEXTS]... [--strategy merge|insert|skip_existing] [--dry-run]
+```
+
+`CONTEXTS` defaults to `Context.BASE` when omitted, and can also be set via the `FIXTURES_CONTEXT` environment variable, handy for CI/deploy scripts that shouldn't need an explicit argument per environment:
+
+```bash
+FIXTURES_CONTEXT=testing manager fixtures load
+```
+
+An explicit CLI argument always takes precedence over the environment variable.
+
 ## Custom CLI
 
 You can extend the CLI by providing your own Typer app. The `manager` entry point will merge your app's commands with the built-in ones:
@@ -78,6 +92,7 @@ import typer
 
 cli = typer.Typer()
 
+
 @cli.command()
 def hello():
     print("Hello from my app!")
@@ -85,7 +100,7 @@ def hello():
 
 ```toml
 [tool.fastapi-toolsets]
-cli = "myapp.cli:cli"
+custom_cli = "myapp.cli:cli"
 ```
 
 ---

docs/module/crud.md

@@ -30,13 +30,14 @@ UserCrud = CrudFactory(model=User)
 from fastapi_toolsets.crud.factory import AsyncCrud
 from myapp.models import User
 
+
 class UserCrud(AsyncCrud[User]):
     model = User
     searchable_fields = [User.username, User.email]
     default_load_options = [selectinload(User.role)]
 ```
 
-Subclassing [`AsyncCrud`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud) directly is the preferred style when you need to add custom methods or when the configuration is complex enough to benefit from a named class body. 
+Subclassing [`AsyncCrud`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud) directly is the preferred style when you need to add custom methods or when the configuration is complex enough to benefit from a named class body.
 
 ### Adding custom methods
 
@@ -61,6 +62,7 @@ from fastapi_toolsets.crud.factory import AsyncCrud
 
 T = TypeVar("T", bound=DeclarativeBase)
 
+
 class AuditedCrud(AsyncCrud[T], Generic[T]):
     """Base CRUD with custom function"""
 
@@ -101,7 +103,9 @@ user = await UserCrud.first(session=session, filters=[User.email == email])
 users = await UserCrud.get_multi(session=session, filters=[User.is_active == True])
 
 # Update
-user = await UserCrud.update(session=session, obj=UserUpdateSchema(username="bob"), filters=[User.id == user_id])
+user = await UserCrud.update(
+    session=session, obj=UserUpdateSchema(username="bob"), filters=[User.id == user_id]
+)
 
 # Delete
 await UserCrud.delete(session=session, filters=[User.id == user_id])
@@ -141,6 +145,41 @@ Use `first` when you only care about any one match and don't need uniqueness:
 user = await UserCrud.first(session=session, filters=[User.is_active == True])
 ```
 
+## Row locking
+
+`get`, `get_or_none`, `first`, `get_multi`, and `update` all accept a `with_for_update` parameter that appends a `FOR UPDATE` clause to the underlying `SELECT`, preventing concurrent transactions from modifying the matched rows until the current transaction commits.
+
+| Value | SQL clause |
+|---|---|
+| `False` (default) | no locking |
+| `True` | `FOR UPDATE` |
+| `"nowait"` | `FOR UPDATE NOWAIT` |
+| `"skip_locked"` | `FOR UPDATE SKIP LOCKED` |
+
+```python
+# Lock before reading — typical read-modify-write pattern
+user = await UserCrud.get(session, [User.id == user_id], with_for_update=True)
+
+# Raise immediately if another transaction holds the lock
+user = await UserCrud.get(session, [User.id == user_id], with_for_update="nowait")
+
+# Skip rows already locked by another transaction (e.g. job queues)
+rows = await JobCrud.get_multi(
+    session, filters=[Job.status == "pending"], with_for_update="skip_locked"
+)
+
+# Lock atomically as part of update (prevents race between SELECT and UPDATE)
+user = await UserCrud.update(
+    session, UserUpdate(credits=10), [User.id == user_id], with_for_update=True
+)
+```
+
+!!! warning
+    `with_for_update` requires an open transaction. Wrap your call in `async with session.begin()` or use the `transaction` helper if you are not already inside one.
+
+!!! note
+    `NOWAIT` raises `sqlalchemy.exc.OperationalError` immediately if the row is locked rather than waiting.
+
 ## Pagination
 
 !!! info "Added in `v1.1` (only offset_pagination via `paginate` if `<v1.1`)"
@@ -159,18 +198,16 @@ Three pagination methods are available.  All return a typed response whose `pagi
 ### Offset pagination
 
 ```python
+from typing import Annotated
+from fastapi import Depends
+
+
 @router.get("")
 async def get_users(
     session: SessionDep,
-    items_per_page: int = 50,
-    page: int = 1,
+    params: Annotated[dict, Depends(UserCrud.offset_paginate_params())],
 ) -> OffsetPaginatedResponse[UserRead]:
-    return await UserCrud.offset_paginate(
-        session=session,
-        items_per_page=items_per_page,
-        page=page,
-        schema=UserRead,
-    )
+    return await UserCrud.offset_paginate(session=session, **params, schema=UserRead)
 ```
 
 The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) method returns an [`OffsetPaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.OffsetPaginatedResponse):
@@ -182,6 +219,7 @@ The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.Async
   "data": ["..."],
   "pagination": {
     "total_count": 100,
+    "pages": 5,
     "page": 1,
     "items_per_page": 20,
     "has_more": true
@@ -189,21 +227,32 @@ The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.Async
 }
 ```
 
+#### Skipping the COUNT query
+
+!!! info "Added in `v2.4.1`"
+
+By default `offset_paginate` runs two queries: one for the page items and one `COUNT(*)` for `total_count`. On large tables the `COUNT` can be expensive. Pass `include_total=False` to `offset_paginate_params()` to skip it:
+
+```python
+@router.get("")
+async def get_users(
+    session: SessionDep,
+    params: Annotated[
+        dict, Depends(UserCrud.offset_paginate_params(include_total=False))
+    ],
+) -> OffsetPaginatedResponse[UserRead]:
+    return await UserCrud.offset_paginate(session=session, **params, schema=UserRead)
+```
+
 ### Cursor pagination
 
 ```python
 @router.get("")
 async def list_users(
     session: SessionDep,
-    cursor: str | None = None,
-    items_per_page: int = 20,
+    params: Annotated[dict, Depends(UserCrud.cursor_paginate_params())],
 ) -> CursorPaginatedResponse[UserRead]:
-    return await UserCrud.cursor_paginate(
-        session=session,
-        cursor=cursor,
-        items_per_page=items_per_page,
-        schema=UserRead,
-    )
+    return await UserCrud.cursor_paginate(session=session, **params, schema=UserRead)
 ```
 
 The [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate) method returns a [`CursorPaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.CursorPaginatedResponse):
@@ -238,7 +287,7 @@ The cursor column is set once on [`CrudFactory`](../reference/crud.md#fastapi_to
 !!! note
     `cursor_column` is required. Calling [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate) on a CRUD class that has no `cursor_column` configured raises a `ValueError`.
 
-The cursor value is base64-encoded when returned to the client and decoded back to the correct Python type on the next request. The following SQLAlchemy column types are supported:
+The cursor value is URL-safe base64-encoded (no padding) when returned to the client and decoded back to the correct Python type on the next request. The following SQLAlchemy column types are supported:
 
 | SQLAlchemy type | Python type |
 |---|---|
@@ -263,25 +312,15 @@ PostCrud = CrudFactory(model=Post, cursor_column=Post.created_at)
 [`paginate()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.paginate) dispatches to `offset_paginate` or `cursor_paginate` based on a `pagination_type` query parameter, letting you expose **one endpoint** that supports both strategies.  The `pagination_type` field in the response tells clients which strategy was used, enabling frontend discriminated-union typing.
 
 ```python
-from fastapi_toolsets.crud import PaginationType
 from fastapi_toolsets.schemas import PaginatedResponse
 
+
 @router.get("")
 async def list_users(
     session: SessionDep,
-    pagination_type: PaginationType = PaginationType.OFFSET,
-    page: int = Query(1, ge=1, description="Current page (offset only)"),
-    cursor: str | None = Query(None, description="Cursor token (cursor only)"),
-    items_per_page: int = Query(20, ge=1, le=100),
+    params: Annotated[dict, Depends(UserCrud.paginate_params())],
 ) -> PaginatedResponse[UserRead]:
-    return await UserCrud.paginate(
-        session,
-        pagination_type=pagination_type,
-        page=page,
-        cursor=cursor,
-        items_per_page=items_per_page,
-        schema=UserRead,
-    )
+    return await UserCrud.paginate(session, **params, schema=UserRead)
 ```
 
 ```
@@ -289,8 +328,6 @@ GET /users?pagination_type=offset&page=2&items_per_page=10
 GET /users?pagination_type=cursor&cursor=eyJ2YWx1ZSI6...&items_per_page=10
 ```
 
-Both `page` and `cursor` are always accepted by the endpoint — unused parameters are silently ignored by `paginate()`.
-
 ## Search
 
 Two search strategies are available, both compatible with [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) and [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate).
@@ -330,49 +367,63 @@ result = await UserCrud.offset_paginate(
 )
 ```
 
+Or via the dependency to narrow which fields are exposed as query parameters:
+
+```python
+params = UserCrud.offset_paginate_params(search_fields=[Post.title])
+```
+
 This allows searching with both [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) and [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate):
 
 ```python
 @router.get("")
 async def get_users(
     session: SessionDep,
-    items_per_page: int = 50,
-    page: int = 1,
-    search: str | None = None,
+    params: Annotated[dict, Depends(UserCrud.offset_paginate_params())],
 ) -> OffsetPaginatedResponse[UserRead]:
-    return await UserCrud.offset_paginate(
-        session=session,
-        items_per_page=items_per_page,
-        page=page,
-        search=search,
-        schema=UserRead,
-    )
+    return await UserCrud.offset_paginate(session=session, **params, schema=UserRead)
 ```
 
 ```python
 @router.get("")
 async def get_users(
     session: SessionDep,
-    cursor: str | None = None,
-    items_per_page: int = 50,
-    search: str | None = None,
+    params: Annotated[dict, Depends(UserCrud.cursor_paginate_params())],
 ) -> CursorPaginatedResponse[UserRead]:
-    return await UserCrud.cursor_paginate(
-        session=session,
-        items_per_page=items_per_page,
-        cursor=cursor,
-        search=search,
-        schema=UserRead,
-    )
+    return await UserCrud.cursor_paginate(session=session, **params, schema=UserRead)
 ```
 
+The dependency adds two query parameters to the endpoint:
+
+| Parameter       | Type          |
+| --------------- | ------------- |
+| `search`        | `str \| null` |
+| `search_column` | `str \| null` |
+
+```
+GET /posts?search=hello                        → search all configured columns
+GET /posts?search=hello&search_column=title    → search only Post.title
+```
+
+The available search column keys are returned in the `search_columns` field of [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse). Use them to populate a column picker in the UI, or to validate `search_column` values on the client side:
+
+```json
+{
+  "status": "SUCCESS",
+  "data": ["..."],
+  "pagination": { "..." },
+  "search_columns": ["content", "author__username", "title"]
+}
+```
+
+!!! info "Key format uses `__` as a separator for relationship chains."
+    A direct column `Post.title` produces `"title"`. A relationship tuple `(Post.author, User.username)` produces `"author__username"`. An unknown `search_column` value raises [`InvalidSearchColumnError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidSearchColumnError) (HTTP 422).
+
 ### Faceted search
 
 !!! info "Added in `v1.2`"
 
-Declare `facet_fields` on the CRUD class to return distinct column values alongside paginated results. This is useful for populating filter dropdowns or building faceted search UIs.
-
-Facet fields use the same syntax as `searchable_fields` — direct columns or relationship tuples:
+Declare `facet_fields` on the CRUD class to return distinct column values alongside paginated results. This is useful for populating filter dropdowns or building faceted search UIs. Relationship traversal is supported via tuples, using the same syntax as `searchable_fields`:
 
 ```python
 UserCrud = CrudFactory(
@@ -394,7 +445,48 @@ result = await UserCrud.offset_paginate(
 )
 ```
 
-The distinct values are returned in the `filter_attributes` field of [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse):
+Or via the dependency to narrow which fields are exposed as query parameters:
+
+```python
+params = UserCrud.offset_paginate_params(facet_fields=[User.country])
+```
+
+Facet filtering is built into the consolidated params dependencies. When `filter=True` (the default), each facet field is exposed as a query parameter and values are collected into `filter_by` automatically:
+
+```python
+from typing import Annotated
+
+from fastapi import Depends
+
+
+@router.get("", response_model_exclude_none=True)
+async def list_users(
+    session: SessionDep,
+    params: Annotated[dict, Depends(UserCrud.offset_paginate_params())],
+) -> OffsetPaginatedResponse[UserRead]:
+    return await UserCrud.offset_paginate(session=session, **params, schema=UserRead)
+```
+
+```python
+@router.get("", response_model_exclude_none=True)
+async def list_users(
+    session: SessionDep,
+    params: Annotated[dict, Depends(UserCrud.cursor_paginate_params())],
+) -> CursorPaginatedResponse[UserRead]:
+    return await UserCrud.cursor_paginate(session=session, **params, schema=UserRead)
+```
+
+Both single-value and multi-value query parameters work:
+
+```
+GET /users?status=active                      → filter_by={"status": ["active"]}
+GET /users?status=active&country=FR           → filter_by={"status": ["active"], "country": ["FR"]}
+GET /users?role__name=admin&role__name=editor → filter_by={"role__name": ["admin", "editor"]}  (IN clause)
+```
+
+`filter_by` and `filters` can be combined — both are applied with AND logic.
+
+The distinct values for each facet field are returned in the `filter_attributes` field of [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse). Use them to populate filter dropdowns in the UI, or to validate `filter_by` keys on the client side:
 
 ```json
 {
@@ -404,57 +496,29 @@ The distinct values are returned in the `filter_attributes` field of [`Paginated
   "filter_attributes": {
     "status": ["active", "inactive"],
     "country": ["DE", "FR", "US"],
-    "name": ["admin", "editor", "viewer"]
+    "role__name": ["admin", "editor", "viewer"]
   }
 }
 ```
 
-Use `filter_by` to pass the client's chosen filter values directly — no need to build SQLAlchemy conditions by hand. Any unknown key raises [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError).
+!!! info "Key format uses `__` as a separator for relationship chains."
+    A direct column `User.status` produces `"status"`. A relationship tuple `(User.role, Role.name)` produces `"role__name"`. A deeper chain `(User.role, Role.permission, Permission.name)` produces `"role__permission__name"`. An unknown `filter_by` key raises [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError) (HTTP 422).
 
-!!! info "The keys in `filter_by` are the same keys the client received in `filter_attributes`."
-    Keys are normally the terminal `column.key` (e.g. `"name"` for `Role.name`). When two facet fields share the same column key (e.g. `(Build.project, Project.name)` and `(Build.os, Os.name)`), the relationship name is prepended automatically: `"project__name"` and `"os__name"`.
+#### Skipping facet queries
 
-`filter_by` and `filters` can be combined — both are applied with AND logic.
+!!! info "Added in `v5.1.0`"
 
-Use [`filter_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.filter_params) to generate a dict with the facet filter values from the query parameters:
+Facet values only change with the filters, not with the page. Pass `include_facets=False` to `offset_paginate_params()` / `cursor_paginate_params()` on pages 2..N to skip the facet queries entirely (`filter_attributes` will be `None`):
 
 ```python
-from typing import Annotated
-
-from fastapi import Depends
-
-UserCrud = CrudFactory(
-    model=User,
-    facet_fields=[User.status, User.country, (User.role, Role.name)],
-)
-
-@router.get("", response_model_exclude_none=True)
-async def list_users(
-    session: SessionDep,
-    page: int = 1,
-    filter_by: Annotated[dict[str, list[str]], Depends(UserCrud.filter_params())],
-) -> OffsetPaginatedResponse[UserRead]:
-    return await UserCrud.offset_paginate(
-        session=session,
-        page=page,
-        filter_by=filter_by,
-        schema=UserRead,
-    )
-```
-
-Both single-value and multi-value query parameters work:
-
-```
-GET /users?status=active              → filter_by={"status": ["active"]}
-GET /users?status=active&country=FR   → filter_by={"status": ["active"], "country": ["FR"]}
-GET /users?role=admin&role=editor     → filter_by={"role": ["admin", "editor"]}  (IN clause)
+params: Annotated[dict, Depends(UserCrud.offset_paginate_params(include_facets=False))]
 ```
 
 ## Sorting
 
 !!! info "Added in `v1.3`"
 
-Declare `order_fields` on the CRUD class to expose client-driven column ordering via `order_by` and `order` query parameters.
+Declare `order_fields` on the CRUD class. Relationship traversal is supported via tuples, using the same syntax as `searchable_fields` and `facet_fields`:
 
 ```python
 UserCrud = CrudFactory(
@@ -462,46 +526,81 @@ UserCrud = CrudFactory(
     order_fields=[
         User.name,
         User.created_at,
+        (User.role, Role.name),  # sort by a related model column
     ],
 )
 ```
 
-Call [`order_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.order_params) to generate a FastAPI dependency that maps the query parameters to an [`OrderByClause`](../reference/crud.md#fastapi_toolsets.crud.factory.OrderByClause) expression:
+You can override `order_fields` per call:
+
+```python
+result = await UserCrud.offset_paginate(
+    session=session,
+    order_fields=[User.name],
+)
+```
+
+Or via the dependency to narrow which fields are exposed as query parameters:
+
+```python
+params = UserCrud.offset_paginate_params(order_fields=[User.name])
+```
+
+Sorting is built into the consolidated params dependencies. When `order=True` (the default), `order_by` and `order` query parameters are exposed and resolved into an `OrderByClause` automatically:
 
 ```python
 from typing import Annotated
 
 from fastapi import Depends
-from fastapi_toolsets.crud import OrderByClause
+
 
 @router.get("")
 async def list_users(
     session: SessionDep,
-    order_by: Annotated[OrderByClause | None, Depends(UserCrud.order_params())],
+    params: Annotated[dict, Depends(UserCrud.offset_paginate_params())],
 ) -> OffsetPaginatedResponse[UserRead]:
-    return await UserCrud.offset_paginate(session=session, order_by=order_by, schema=UserRead)
+    return await UserCrud.offset_paginate(session=session, **params, schema=UserRead)
+```
+
+```python
+@router.get("")
+async def list_users(
+    session: SessionDep,
+    params: Annotated[dict, Depends(UserCrud.cursor_paginate_params())],
+) -> CursorPaginatedResponse[UserRead]:
+    return await UserCrud.cursor_paginate(session=session, **params, schema=UserRead)
 ```
 
 The dependency adds two query parameters to the endpoint:
 
 | Parameter  | Type            |
 | ---------- | --------------- |
-| `order_by` | `str | null`   |
+| `order_by` | `str \| null`  |
 | `order`    | `asc` or `desc` |
 
 ```
-GET /users?order_by=name&order=asc   → ORDER BY users.name ASC
-GET /users?order_by=name&order=desc  → ORDER BY users.name DESC
+GET /users?order_by=name&order=asc         → ORDER BY users.name ASC
+GET /users?order_by=role__name&order=desc  → LEFT JOIN roles ON ... ORDER BY roles.name DESC
 ```
 
-An unknown `order_by` value raises [`InvalidOrderFieldError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError) (HTTP 422).
+!!! info "Relationship tuples are joined automatically."
+    When a relation field is selected, the related table is LEFT OUTER JOINed automatically. An unknown `order_by` value raises [`InvalidOrderFieldError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError) (HTTP 422).
 
-You can also pass `order_fields` directly to `order_params()` to override the class-level defaults without modifying them:
 
-```python
-UserOrderParams = UserCrud.order_params(order_fields=[User.name])
+The available sort keys are returned in the `order_columns` field of [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse). Use them to populate a sort picker in the UI, or to validate `order_by` values on the client side:
+
+```json
+{
+  "status": "SUCCESS",
+  "data": ["..."],
+  "pagination": { "..." },
+  "order_columns": ["created_at", "name", "role__name"]
+}
 ```
 
+!!! info "Key format uses `__` as a separator for relationship chains."
+    A direct column `User.name` produces `"name"`. A relationship tuple `(User.role, Role.name)` produces `"role__name"`.
+
 ## Relationship loading
 
 !!! info "Added in `v1.1`"
@@ -547,7 +646,9 @@ PostCrud = CrudFactory(
     m2m_fields={"tag_ids": Post.tags},
 )
 
-post = await PostCrud.create(session=session, obj=PostCreateSchema(title="Hello", tag_ids=[1, 2, 3]))
+post = await PostCrud.create(
+    session=session, obj=PostCreateSchema(title="Hello", tag_ids=[1, 2, 3])
+)
 ```
 
 ## Upsert
@@ -574,6 +675,7 @@ class UserRead(PydanticBase):
     id: UUID
     username: str
 
+
 @router.get(
     "/{uuid}",
     responses=generate_error_responses(NotFoundError),
@@ -585,12 +687,14 @@ async def get_user(session: SessionDep, uuid: UUID) -> Response[UserRead]:
         schema=UserRead,
     )
 
+
 @router.get("")
-async def list_users(session: SessionDep, page: int = 1) -> OffsetPaginatedResponse[UserRead]:
+async def list_users(
+    session: SessionDep,
+    params: Annotated[dict, Depends(crud.UserCrud.offset_paginate_params())],
+) -> OffsetPaginatedResponse[UserRead]:
     return await crud.UserCrud.offset_paginate(
-        session=session,
-        page=page,
-        schema=UserRead,
+        session=session, **params, schema=UserRead
     )
 ```
 

docs/module/db.md

@@ -1,77 +1,181 @@
 # DB
 
-SQLAlchemy async session management with transactions, table locking, and row-change polling.
+SQLAlchemy async session management with transactions, table locking, advisory locking, and row-change polling.
 
 !!! info
     This module has been coded and tested to be compatible with PostgreSQL only.
 
 ## Overview
 
-The `db` module provides helpers to create FastAPI dependencies and context managers for `AsyncSession`, along with utilities for nested transactions, table lock and polling for row changes.
+The `db` module is built around one object, [`Database`](../reference/db.md#fastapi_toolsets.db.Database), which owns the engine and sessionmaker and exposes the FastAPI dependency, a commit-before-response middleware, session/transaction context managers, and table locking. Free helpers cover savepoint-aware transactions, advisory locks, many-to-many association tables, and row-change polling.
 
-## Session dependency
+## Setup
 
-Use [`create_db_dependency`](../reference/db.md#fastapi_toolsets.db.create_db_dependency) to create a FastAPI dependency that yields a session and auto-commits on success:
+Create one `Database` for your app. Provide a **URL** (the facade builds and disposes the engine) or pass an existing **`engine=`** you own (e.g. for Alembic or `event.listen`). The session factory is built internally with `expire_on_commit=False`.
 
 ```python
-from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
-from fastapi_toolsets.db import create_db_dependency
+from fastapi import Depends, FastAPI
+from sqlalchemy.ext.asyncio import AsyncSession
 
-engine = create_async_engine(url="postgresql+asyncpg://...", future=True)
-session_maker = async_sessionmaker(bind=engine, expire_on_commit=False)
+from fastapi_toolsets.db import Database
 
-get_db = create_db_dependency(session_maker=session_maker)
+db = Database("postgresql+asyncpg://postgres:postgres@localhost/app")
 
-@router.get("/users")
-async def list_users(session: AsyncSession = Depends(get_db)):
-    ...
+app = FastAPI()
+db.install(app)  # commit middleware + engine disposal on shutdown
+
+
+@app.get("/users")
+async def list_users(session: AsyncSession = Depends(db)): ...
 ```
 
+The `Database` instance **is** the dependency: use it directly as `Depends(db)`. The whole request runs as a single transaction (CRUD writes use savepoints under it).
+
+The **URL** may be a plain string or a Pydantic [`PostgresDsn`](https://docs.pydantic.dev/latest/api/networks/#pydantic.networks.PostgresDsn). In URL mode you can tune the engine: pass `connect_args` for DBAPI-level options and any other keyword for `create_async_engine` (e.g. `pool_size`, `echo`, `pool_pre_ping`):
+
+```python
+from pydantic_settings import BaseSettings
+from pydantic import PostgresDsn
+
+
+class Settings(BaseSettings):
+    database_url: PostgresDsn
+
+
+settings = Settings()
+
+db = Database(
+    settings.database_url,
+    pool_size=20,
+    pool_pre_ping=True,
+    connect_args={"server_settings": {"application_name": "myapp"}},
+)
+```
+
+## Committing before the response
+
+[`db.install(app)`](../reference/db.md#fastapi_toolsets.db.Database) adds a middleware that commits the request's session when the response starts, after the endpoint returns and before the body is sent. With the middleware installed, the dependency does not commit again.
+
+The request is committed as a single transaction:
+
+- **Read-after-write**: a follow-up request sees the write.
+- **Atomicity**: multi-write endpoints roll back as a unit on failure.
+- **Errors roll back**: on a raised exception the session rolls back and nothing is committed.
+
+Without `install`, the session commits in the dependency teardown, which runs after the response has been sent.
+
+!!! warning "Streaming / SSE endpoints"
+    For a `StreamingResponse` / `EventSourceResponse`, the commit fires at the **start** of the stream. A stream that **writes** must open a short-lived session per write with [`db.session()`](#session-context-manager); the start-time commit will not flush writes made later during the stream.
+
+## Lifespan
+
+`db.install(app)` disposes the engine on shutdown, composing around your own lifespan:
+
+```python
+from contextlib import asynccontextmanager
+
+
+@asynccontextmanager
+async def lifespan(app):
+    await warm_cache()  # your startup
+    yield
+    await flush_metrics()  # your shutdown
+
+
+app = FastAPI(lifespan=lifespan)
+db.install(app)  # your shutdown runs first, then the engine is disposed
+```
+
+If you have no lifespan of your own, [`db.lifespan`](../reference/db.md#fastapi_toolsets.db.Database) works standalone as `FastAPI(lifespan=db.lifespan)`. Engine disposal is idempotent and is a no-op when you passed your own `engine=`.
+
 ## Session context manager
 
-Use [`create_db_context`](../reference/db.md#fastapi_toolsets.db.create_db_context) for sessions outside request handlers (e.g. background tasks, CLI commands):
+Use [`db.session()`](../reference/db.md#fastapi_toolsets.db.Database) for sessions outside request handlers (e.g. background tasks, CLI commands). It commits on clean exit and rolls back on exception:
 
 ```python
-from fastapi_toolsets.db import create_db_context
-
-db_context = create_db_context(session_maker=session_maker)
-
 async def seed():
-    async with db_context() as session:
+    async with db.session() as session:
         ...
 ```
 
-## Nested transactions
+## Transactions
 
-[`get_transaction`](../reference/db.md#fastapi_toolsets.db.get_transaction) handles savepoints automatically, allowing safe nesting:
+[`transaction`](../reference/db.md#fastapi_toolsets.db.transaction) opens a transaction on a session, using a savepoint when one is already open so it nests safely:
 
 ```python
-from fastapi_toolsets.db import get_transaction
+from fastapi_toolsets.db import transaction
 
-async def create_user_with_role(session=session):
-    async with get_transaction(session=session):
+
+async def create_user_with_role(session):
+    async with transaction(session):
         ...
-        async with get_transaction(session=session):  # uses savepoint
+        async with transaction(session):  # uses a savepoint
             ...
 ```
 
+When you have a `Database`, [`db.begin()`](../reference/db.md#fastapi_toolsets.db.Database) opens a session already inside a transaction:
+
+```python
+async with db.begin() as session:
+    session.add(User(name="ada"))  # commits on exit, rolls back on exception
+```
+
 ## Table locking
 
-[`lock_tables`](../reference/db.md#fastapi_toolsets.db.lock_tables) acquires PostgreSQL table-level locks before executing critical sections:
+[`db.lock_tables`](../reference/db.md#fastapi_toolsets.db.Database) acquires PostgreSQL table-level locks for a critical section. It opens a dedicated session internally and releases the lock when the context exits:
 
 ```python
-from fastapi_toolsets.db import lock_tables
+from fastapi_toolsets.db import LockMode
 
-async with lock_tables(session=session, tables=[User], mode="EXCLUSIVE"):
+async with db.lock_tables([User], mode=LockMode.EXCLUSIVE) as session:
     # No other transaction can modify User until this block exits
     ...
 ```
 
 Available lock modes are defined in [`LockMode`](../reference/db.md#fastapi_toolsets.db.LockMode): `ACCESS_SHARE`, `ROW_SHARE`, `ROW_EXCLUSIVE`, `SHARE_UPDATE_EXCLUSIVE`, `SHARE`, `SHARE_ROW_EXCLUSIVE`, `EXCLUSIVE`, `ACCESS_EXCLUSIVE`.
 
+Pass `timeout` to limit how long the lock waits. On timeout, a [`LockTimeoutError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.LockTimeoutError) is raised instead of a raw database error:
+
+```python
+async with db.lock_tables([Order], timeout="2s") as session:
+    ...
+```
+
+## Advisory locking
+
+[`advisory_lock`](../reference/db.md#fastapi_toolsets.db.advisory_lock) acquires a PostgreSQL session-level advisory lock on a session you provide. The lock is released when the context exits:
+
+```python
+from fastapi_toolsets.db import advisory_lock
+
+# Blocking exclusive lock: waits until the lock is free
+async with advisory_lock(session=session, key=42):
+    ...
+
+# Non-blocking: yields False immediately if already held
+async with advisory_lock(session=session, key=42, nowait=True) as acquired:
+    if not acquired:
+        raise HTTPException(409, "Resource is locked")
+
+# Blocking with a timeout: raises LockTimeoutError if not acquired in time
+async with advisory_lock(session=session, key=42, timeout="5s"):
+    ...
+
+# Shared lock: multiple readers allowed simultaneously, blocks exclusive writers
+async with advisory_lock(session=session, key=42, shared=True):
+    ...
+
+# Two-integer key for namespacing (e.g. lock_type + resource_id)
+async with advisory_lock(session=session, key=(1, user_id)):
+    ...
+```
+
+!!! note
+    Advisory locks use PostgreSQL session-level functions (`pg_advisory_lock` / `pg_advisory_unlock`). The lock is tied to the database connection, not the SQLAlchemy transaction, so it is released when the context exits even if the surrounding transaction is still open.
+
 ## Row-change polling
 
-[`wait_for_row_change`](../reference/db.md#fastapi_toolsets.db.wait_for_row_change) polls a row until a specific column changes value, useful for waiting on async side effects:
+[`wait_for_row_change`](../reference/db.md#fastapi_toolsets.db.wait_for_row_change) polls a row until a specific column changes value:
 
 ```python
 from fastapi_toolsets.db import wait_for_row_change
@@ -81,7 +185,7 @@ await wait_for_row_change(
     session=session,
     model=Order,
     pk_value=order_id,
-    columns=[Order.status],
+    columns=["status"],
     interval=1.0,
     timeout=30.0,
 )
@@ -89,28 +193,25 @@ await wait_for_row_change(
 
 ## Creating a database
 
-!!! info "Added in `v2.1`"
-
-[`create_database`](../reference/db.md#fastapi_toolsets.db.create_database) creates a database at a given URL. It connects to *server_url* and issues a `CREATE DATABASE` statement:
+[`create_database`](../reference/db.md#fastapi_toolsets.db.testing.create_database) (in `fastapi_toolsets.db.testing`) connects to *server_url* and issues a `CREATE DATABASE` statement:
 
 ```python
-from fastapi_toolsets.db import create_database
+from fastapi_toolsets.db.testing import create_database
 
 SERVER_URL = "postgresql+asyncpg://postgres:postgres@localhost/postgres"
 
 await create_database(db_name="myapp_test", server_url=SERVER_URL)
 ```
 
-For test isolation with automatic cleanup, use [`create_worker_database`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_worker_database) from the `pytest` module instead — it handles drop-before, create, and drop-after automatically.
+For test isolation with automatic cleanup, use [`create_worker_database`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_worker_database) from the `pytest` module, which handles drop-before, create, and drop-after.
 
 ## Cleaning up tables
 
-!!! info "Added in `v2.1`"
-
-[`cleanup_tables`](../reference/db.md#fastapi_toolsets.db.cleanup_tables) truncates all tables:
+[`cleanup_tables`](../reference/db.md#fastapi_toolsets.db.testing.cleanup_tables) (in `fastapi_toolsets.db.testing`) truncates all tables:
 
 ```python
-from fastapi_toolsets.db import cleanup_tables
+from fastapi_toolsets.db.testing import cleanup_tables
+
 
 @pytest.fixture(autouse=True)
 async def clean(db_session):
@@ -118,6 +219,57 @@ async def clean(db_session):
     await cleanup_tables(session=db_session, base=Base)
 ```
 
+## Many-to-Many helpers
+
+The three `m2m_*` helpers modify a many-to-many association table with direct SQL, without loading the ORM collection.
+
+### `m2m_add`: insert associations
+
+[`m2m_add`](../reference/db.md#fastapi_toolsets.db.m2m_add) inserts one or more rows into a secondary table:
+
+```python
+from fastapi_toolsets.db import m2m_add
+
+async with db.lock_tables([Tag]) as session:
+    tag = await TagCrud.create(session, TagCreate(name="python"))
+    await m2m_add(session, post, Post.tags, tag)
+```
+
+Pass `ignore_conflicts=True` to skip associations that already exist:
+
+```python
+await m2m_add(session, post, Post.tags, tag, ignore_conflicts=True)
+```
+
+### `m2m_remove`: delete associations
+
+[`m2m_remove`](../reference/db.md#fastapi_toolsets.db.m2m_remove) deletes specific association rows. Removing a non-existent association is a no-op:
+
+```python
+from fastapi_toolsets.db import m2m_remove, transaction
+
+async with transaction(session):
+    await m2m_remove(session, post, Post.tags, tag1, tag2)
+```
+
+### `m2m_set`: replace the full set
+
+[`m2m_set`](../reference/db.md#fastapi_toolsets.db.m2m_set) replaces all associations: it deletes every existing row for the owner instance then inserts the new set. Passing no related instances clears the association:
+
+```python
+from fastapi_toolsets.db import m2m_set, transaction
+
+# Replace all tags
+async with transaction(session):
+    await m2m_set(session, post, Post.tags, tag_a, tag_b)
+
+# Clear all tags
+async with transaction(session):
+    await m2m_set(session, post, Post.tags)
+```
+
+All three helpers raise `TypeError` if the relationship attribute is not a Many-to-Many (i.e. has no secondary table).
+
 ---
 
 [:material-api: API Reference](../reference/db.md)

docs/module/dependencies.md

@@ -20,6 +20,7 @@ UserDep = PathDependency(model=User, field=User.id, session_dep=get_db)
 SessionDep = Annotated[AsyncSession, Depends(get_db)]
 UserDep = PathDependency(model=User, field=User.id, session_dep=SessionDep)
 
+
 @router.get("/users/{user_id}")
 async def get_user(user: User = UserDep):
     return user
@@ -30,6 +31,7 @@ By default the parameter name is inferred from the field (`user_id` for `User.id
 ```python
 UserDep = PathDependency(model=User, field=User.id, session_dep=get_db, param_name="id")
 
+
 @router.get("/users/{id}")
 async def get_user(user: User = UserDep):
     return user
@@ -43,11 +45,15 @@ async def get_user(user: User = UserDep):
 from fastapi_toolsets.dependencies import BodyDependency
 
 # Plain callable
-RoleDep = BodyDependency(model=Role, field=Role.id, session_dep=get_db, body_field="role_id")
+RoleDep = BodyDependency(
+    model=Role, field=Role.id, session_dep=get_db, body_field="role_id"
+)
 
 # Annotated
 SessionDep = Annotated[AsyncSession, Depends(get_db)]
-RoleDep = BodyDependency(model=Role, field=Role.id, session_dep=SessionDep, body_field="role_id")
+RoleDep = BodyDependency(
+    model=Role, field=Role.id, session_dep=SessionDep, body_field="role_id"
+)
 
 
 @router.post("/users")

docs/module/exceptions.md

@@ -39,6 +39,8 @@ It also patches `app.openapi()` to replace the default Pydantic 422 schema with
 | [`NoSearchableFieldsError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NoSearchableFieldsError) | 400 | No Searchable Fields |
 | [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError) | 400 | Invalid Facet Filter |
 | [`InvalidOrderFieldError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError) | 422 | Invalid Order Field |
+| [`PoolExhaustedError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.PoolExhaustedError) | 503 | Service Unavailable |
+| [`LockTimeoutError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.LockTimeoutError) | 503 | Service Unavailable |
 
 ### Per-instance overrides
 
@@ -51,7 +53,9 @@ All built-in exceptions accept optional keyword arguments to customise the respo
 | `data` | Overrides the `data` field |
 
 ```python
-raise NotFoundError(detail="User 42 not found", desc="No user with that ID exists in the database.")
+raise NotFoundError(
+    detail="User 42 not found", desc="No user with that ID exists in the database."
+)
 ```
 
 ## Custom exceptions
@@ -62,6 +66,7 @@ Subclass [`ApiException`](../reference/exceptions.md#fastapi_toolsets.exceptions
 from fastapi_toolsets.exceptions import ApiException
 from fastapi_toolsets.schemas import ApiError
 
+
 class PaymentRequiredError(ApiException):
     api_error = ApiError(
         code=402,
@@ -103,11 +108,17 @@ Use `abstract=True` when creating a shared base that is not meant to be raised d
 class BillingError(ApiException, abstract=True):
     """Base for all billing-related errors."""
 
+
 class PaymentRequiredError(BillingError):
-    api_error = ApiError(code=402, msg="Payment Required", desc="...", err_code="BILLING-402")
+    api_error = ApiError(
+        code=402, msg="Payment Required", desc="...", err_code="BILLING-402"
+    )
+
 
 class SubscriptionExpiredError(BillingError):
-    api_error = ApiError(code=402, msg="Subscription Expired", desc="...", err_code="BILLING-402-EXP")
+    api_error = ApiError(
+        code=402, msg="Subscription Expired", desc="...", err_code="BILLING-402-EXP"
+    )
 ```
 
 ## OpenAPI response documentation

docs/module/fixtures.md

@@ -13,6 +13,7 @@ from fastapi_toolsets.fixtures import FixtureRegistry, Context
 
 fixtures = FixtureRegistry()
 
+
 @fixtures.register
 def roles():
     return [
@@ -20,6 +21,7 @@ def roles():
         Role(id=2, name="user"),
     ]
 
+
 @fixtures.register(depends_on=["roles"], contexts=[Context.TESTING])
 def test_users():
     return [
@@ -38,18 +40,20 @@ By context with [`load_fixtures_by_context`](../reference/fixtures.md#fastapi_to
 from fastapi_toolsets.fixtures import load_fixtures_by_context
 
 async with db_context() as session:
-    await load_fixtures_by_context(session=session, registry=fixtures, context=Context.TESTING)
+    await load_fixtures_by_context(session, fixtures, Context.TESTING)
 ```
 
-Directly with [`load_fixtures`](../reference/fixtures.md#fastapi_toolsets.fixtures.utils.load_fixtures):
+Directly by name with [`load_fixtures`](../reference/fixtures.md#fastapi_toolsets.fixtures.utils.load_fixtures):
 
 ```python
 from fastapi_toolsets.fixtures import load_fixtures
 
 async with db_context() as session:
-    await load_fixtures(session=session, registry=fixtures)
+    await load_fixtures(session, fixtures, "roles", "test_users")
 ```
 
+Both functions return a `dict[str, list[...]]` mapping each fixture name to the list of loaded instances.
+
 ## Contexts
 
 [`Context`](../reference/fixtures.md#fastapi_toolsets.fixtures.enum.Context) is an enum with predefined values:
@@ -58,10 +62,74 @@ async with db_context() as session:
 |---------|-------------|
 | `Context.BASE` | Core data required in all environments |
 | `Context.TESTING` | Data only loaded during tests |
+| `Context.DEVELOPMENT` | Data only loaded in development |
 | `Context.PRODUCTION` | Data only loaded in production |
 
 A fixture with no `contexts` defined takes `Context.BASE` by default.
 
+`Context.BASE` fixtures are always included alongside whatever context you load or list — there's no way to load a non-base context in isolation:
+
+```python
+# also loads any Context.BASE fixtures, even though only TESTING is requested
+await load_fixtures_by_context(session, fixtures, Context.TESTING)
+```
+
+### Custom contexts
+
+Plain strings and any `Enum` subclass are accepted wherever a `Context` enum is expected.
+
+```python
+from enum import Enum
+
+
+class AppContext(str, Enum):
+    STAGING = "staging"
+    DEMO = "demo"
+
+
+@fixtures.register(contexts=[AppContext.STAGING])
+def staging_data():
+    return [Config(key="feature_x", enabled=True)]
+
+
+# loads staging_data plus any Context.BASE fixtures
+await load_fixtures_by_context(session, fixtures, AppContext.STAGING)
+```
+
+### Default context for a registry
+
+Pass `contexts` to `FixtureRegistry` to set a default for all fixtures registered in it:
+
+```python
+testing_registry = FixtureRegistry(contexts=[Context.TESTING])
+
+
+@testing_registry.register  # implicitly contexts=[Context.TESTING]
+def test_orders():
+    return [Order(id=1, total=99)]
+```
+
+### Same fixture name, multiple context variants
+
+The same fixture name may be registered under different (non-overlapping) context sets. When multiple contexts are loaded together, all matching variants are merged:
+
+```python
+@fixtures.register(contexts=[Context.BASE])
+def users():
+    return [User(id=1, username="admin")]
+
+
+@fixtures.register(contexts=[Context.TESTING])
+def users():
+    return [User(id=2, username="tester")]
+
+
+# loads both admin and tester (Context.BASE is included automatically)
+await load_fixtures_by_context(session, fixtures, Context.TESTING)
+```
+
+Registering two variants with overlapping context sets raises `ValueError`.
+
 ## Load strategies
 
 [`LoadStrategy`](../reference/fixtures.md#fastapi_toolsets.fixtures.enum.LoadStrategy) controls how the fixture loader handles rows that already exist:
@@ -69,20 +137,54 @@ A fixture with no `contexts` defined takes `Context.BASE` by default.
 | Strategy | Description |
 |----------|-------------|
 | `LoadStrategy.INSERT` | Insert only, fail on duplicates |
-| `LoadStrategy.UPSERT` | Insert or update on conflict |
-| `LoadStrategy.SKIP` | Skip rows that already exist |
+| `LoadStrategy.MERGE` | Insert or update on conflict (default) |
+| `LoadStrategy.SKIP_EXISTING` | Skip rows that already exist |
+
+```python
+await load_fixtures_by_context(
+    session, fixtures, Context.BASE, strategy=LoadStrategy.SKIP_EXISTING
+)
+```
 
 ## Merging registries
 
-Split fixtures definitions across modules and merge them:
+Split fixture definitions across modules and merge them:
 
 ```python
 from myapp.fixtures.dev import dev_fixtures
 from myapp.fixtures.prod import prod_fixtures
 
-fixtures = fixturesRegistry()
+fixtures = FixtureRegistry()
 fixtures.include_registry(registry=dev_fixtures)
 fixtures.include_registry(registry=prod_fixtures)
+```
+
+Fixtures with the same name are allowed as long as their context sets do not overlap. Conflicting contexts raise `ValueError`.
+
+## Looking up fixture instances
+
+[`FixtureRegistry.obj`](../reference/fixtures.md#fastapi_toolsets.fixtures.registry.FixtureRegistry.obj) retrieves a specific instance from a registered fixture by attribute value, looked up by name on the registry — useful when building cross-fixture `depends_on` relationships:
+
+```python
+@fixtures.register(depends_on=["roles"])
+def users():
+    admin_role = fixtures.obj("roles", "name", "admin")
+    return [User(id=1, username="alice", role_id=admin_role.id)]
+```
+
+Looking the fixture up by name (instead of importing the `roles` function directly) means fixture modules never need to import each other, which avoids circular imports in larger projects split across multiple files — the same reason `depends_on` takes fixture names rather than the functions themselves. The registry passed in must be the one that actually contains the fixture by load time; with a single shared registry this is automatic, but if you merge registries with `include_registry`, call `obj`/`field` on the merged registry.
+
+[`FixtureRegistry.field`](../reference/fixtures.md#fastapi_toolsets.fixtures.registry.FixtureRegistry.field) is shorthand for pulling a single attribute (`id` by default):
+
+```python
+@fixtures.register(depends_on=["roles"])
+def users():
+    return [
+        User(id=1, username="alice", role_id=fixtures.field("roles", "name", "admin"))
+    ]
+```
+
+Both raise `StopIteration` if no matching instance is found, and `KeyError` if the fixture name isn't registered.
 
 ## Pytest integration
 
@@ -97,21 +199,23 @@ from app.models import Base
 
 DATABASE_URL = "postgresql+asyncpg://user:pass@localhost/test_db"
 
+
 @pytest.fixture
 async def db_session():
-    async with create_db_session(database_url=DATABASE_URL, base=Base, cleanup=True) as session:
+    async with create_db_session(
+        database_url=DATABASE_URL, base=Base, cleanup=True
+    ) as session:
         yield session
 
+
 register_fixtures(registry=registry, namespace=globals())
 ```
 
 ```python
 # test_users.py
-async def test_user_can_login(fixture_users: list[User], fixture_roles: list[Role]):
-    ...
+async def test_user_can_login(fixture_users: list[User], fixture_roles: list[Role]): ...
 ```
 
-
 The load order is resolved automatically from the `depends_on` declarations in your registry. Each generated fixture receives `db_session` as a dependency and returns the list of loaded model instances.
 
 ## CLI integration

docs/module/metrics.md

@@ -47,10 +47,12 @@ If neither of these applies to you, declaring metrics at module level (e.g. `HTT
 ```python
 from prometheus_client import Counter, Histogram
 
+
 @metrics.register
 def http_requests():
     return Counter("http_requests_total", "Total HTTP requests", ["method", "status"])
 
+
 @metrics.register
 def request_duration():
     return Histogram("request_duration_seconds", "Request duration")
@@ -79,6 +81,7 @@ from prometheus_client import Gauge
 
 _queue_depth = Gauge("queue_depth", "Current queue depth")
 
+
 @metrics.register(collect=True)
 def collect_queue_depth():
     _queue_depth.set(get_current_queue_depth())

docs/module/models.md

@@ -11,6 +11,7 @@ The `models` module provides mixins that each add a single, well-defined column
 ```python
 from fastapi_toolsets.models import UUIDMixin, TimestampMixin
 
+
 class Article(Base, UUIDMixin, TimestampMixin):
     __tablename__ = "articles"
 
@@ -31,11 +32,13 @@ Adds a `id: UUID` primary key generated server-side by PostgreSQL using `gen_ran
 ```python
 from fastapi_toolsets.models import UUIDMixin
 
+
 class User(Base, UUIDMixin):
     __tablename__ = "users"
 
     username: Mapped[str]
 
+
 # id is None before flush
 user = User(username="alice")
 session.add(user)
@@ -54,11 +57,13 @@ Adds a `id: UUID` primary key generated server-side by PostgreSQL using `uuidv7(
 ```python
 from fastapi_toolsets.models import UUIDv7Mixin
 
+
 class Event(Base, UUIDv7Mixin):
     __tablename__ = "events"
 
     name: Mapped[str]
 
+
 # id is None before flush
 event = Event(name="user.signup")
 session.add(event)
@@ -73,6 +78,7 @@ Adds a `created_at: datetime` column set to `clock_timestamp()` on insert. The c
 ```python
 from fastapi_toolsets.models import UUIDMixin, CreatedAtMixin
 
+
 class Order(Base, UUIDMixin, CreatedAtMixin):
     __tablename__ = "orders"
 
@@ -86,11 +92,13 @@ Adds an `updated_at: datetime` column set to `clock_timestamp()` on insert and a
 ```python
 from fastapi_toolsets.models import UUIDMixin, UpdatedAtMixin
 
+
 class Post(Base, UUIDMixin, UpdatedAtMixin):
     __tablename__ = "posts"
 
     title: Mapped[str]
 
+
 post = Post(title="Hello")
 await session.flush()
 await session.refresh(post)
@@ -111,109 +119,134 @@ Convenience mixin that combines [`CreatedAtMixin`](../reference/models.md#fastap
 ```python
 from fastapi_toolsets.models import UUIDMixin, TimestampMixin
 
+
 class Article(Base, UUIDMixin, TimestampMixin):
     __tablename__ = "articles"
 
     title: Mapped[str]
 ```
 
-### [`WatchedFieldsMixin`](../reference/models.md#fastapi_toolsets.models.WatchedFieldsMixin)
+## Lifecycle events
 
-!!! info "Added in `v2.4`"
+The event system provides lifecycle callbacks that fire **after commit**. If the transaction rolls back, no callback fires.
 
-`WatchedFieldsMixin` provides lifecycle callbacks that fire **after commit** — meaning the row is durably persisted when your callback runs. If the transaction rolls back, no callback fires.
+### Setup
 
-Three callbacks are available, each corresponding to a [`ModelEvent`](../reference/models.md#fastapi_toolsets.models.ModelEvent) value:
+Event dispatch requires [`EventSession`](../reference/models.md#fastapi_toolsets.models.EventSession). Pass it as the session class when creating your session factory:
 
-| Callback | Event | Trigger |
-|---|---|---|
-| `on_create()` | `ModelEvent.CREATE` | After `INSERT` |
-| `on_delete()` | `ModelEvent.DELETE` | After `DELETE` |
-| `on_update(changes)` | `ModelEvent.UPDATE` | After `UPDATE` on a watched field |
+```python
+from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+from fastapi_toolsets.models import EventSession
 
-Server-side defaults (e.g. `id`, `created_at`) are fully populated in all callbacks. All callbacks support both `async def` and plain `def`. Use `@watch` to restrict which fields trigger `on_update`:
+engine = create_async_engine("postgresql+asyncpg://...")
+SessionLocal = async_sessionmaker(engine, expire_on_commit=False, class_=EventSession)
+```
 
-| Decorator | `on_update` behaviour |
+!!! info "Callbacks fire on `session.commit()` only — not on savepoints."
+    Savepoints created by [`transaction`](db.md) or `begin_nested()` do **not**
+    trigger callbacks. All events accumulated across flushes are dispatched once
+    when the outermost `commit()` is called.
+
+### Events
+
+Three event types are available, each corresponding to a [`ModelEvent`](../reference/models.md#fastapi_toolsets.models.ModelEvent) value:
+
+| Event | Trigger |
 |---|---|
-| `@watch("status", "role")` | Only fires when `status` or `role` changes |
-| *(no decorator)* | Fires when **any** mapped field changes |
+| `ModelEvent.CREATE` | After `INSERT` commit |
+| `ModelEvent.DELETE` | After `DELETE` commit |
+| `ModelEvent.UPDATE` | After `UPDATE` commit on a watched field |
 
-#### Option 1 — catch-all with `on_event`
+!!! warning "Callbacks fire only for ORM-level changes. Rows updated via raw SQL (`UPDATE ... SET ...`) are not detected."
 
-Override `on_event` to handle all event types in one place. The specific methods delegate here by default:
+### Watched fields
+
+Set `__watched_fields__` on the model to restrict which field changes trigger `UPDATE` events. It must be a `tuple[str, ...]` — any other type raises `TypeError`:
+
+| Class attribute | `UPDATE` behaviour |
+|---|---|
+| `__watched_fields__ = ("status", "role")` | Only fires when `status` or `role` changes |
+| *(not set)* | Fires when **any** mapped field changes |
+
+`__watched_fields__` is inherited through the class hierarchy via normal Python MRO. A subclass can override it:
 
 ```python
-from fastapi_toolsets.models import ModelEvent, UUIDMixin, WatchedFieldsMixin, watch
+class Order(Base, UUIDMixin):
+    __watched_fields__ = ("status",)
+    ...
 
-@watch("status")
-class Order(Base, UUIDMixin, WatchedFieldsMixin):
+
+class UrgentOrder(Order):
+    # inherits __watched_fields__ = ("status",)
+    ...
+
+
+class PriorityOrder(Order):
+    __watched_fields__ = ("priority",)
+    # overrides parent — UPDATE fires only for priority changes
+    ...
+```
+
+### Registering handlers
+
+Register handlers with the [`listens_for`](../reference/models.md#fastapi_toolsets.models.listens_for) decorator. Every callback receives three arguments: the model instance, the [`ModelEvent`](../reference/models.md#fastapi_toolsets.models.ModelEvent) that triggered it, and a `changes` dict (`None` for `CREATE` and `DELETE`):
+
+```python
+from fastapi_toolsets.models import ModelEvent, UUIDMixin, listens_for
+
+
+class Order(Base, UUIDMixin):
     __tablename__ = "orders"
+    __watched_fields__ = ("status",)
 
     status: Mapped[str]
 
-    async def on_event(self, event: ModelEvent, changes: dict | None = None) -> None:
-        if event == ModelEvent.CREATE:
-            await notify_new_order(self.id)
-        elif event == ModelEvent.DELETE:
-            await notify_order_cancelled(self.id)
-        elif event == ModelEvent.UPDATE:
-            await notify_status_change(self.id, changes["status"])
+
+@listens_for(Order, [ModelEvent.CREATE])
+async def on_order_created(order: Order, event_type: ModelEvent, changes: None):
+    await notify_new_order(order.id)
+
+
+@listens_for(Order, [ModelEvent.DELETE])
+async def on_order_deleted(order: Order, event_type: ModelEvent, changes: None):
+    await notify_order_cancelled(order.id)
+
+
+@listens_for(Order, [ModelEvent.UPDATE])
+async def on_order_updated(order: Order, event_type: ModelEvent, changes: dict):
+    if "status" in changes:
+        await notify_status_change(order.id, changes["status"])
 ```
 
-#### Option 2 — targeted overrides
+Multiple handlers can be registered for the same model and event. Handlers registered on a parent class also fire for subclass instances.
 
-Override individual methods for more focused logic:
+A single handler can listen for multiple events at once. When `event_types` is omitted, the handler fires for all events:
 
 ```python
-@watch("status")
-class Order(Base, UUIDMixin, WatchedFieldsMixin):
-    __tablename__ = "orders"
+@listens_for(Order, [ModelEvent.CREATE, ModelEvent.UPDATE])
+async def on_order_changed(order: Order, event_type: ModelEvent, changes: dict | None):
+    await invalidate_cache(order.id)
 
-    status: Mapped[str]
 
-    async def on_create(self) -> None:
-        await notify_new_order(self.id)
-
-    async def on_delete(self) -> None:
-        await notify_order_cancelled(self.id)
-
-    async def on_update(self, changes: dict) -> None:
-        if "status" in changes:
-            old = changes["status"]["old"]
-            new = changes["status"]["new"]
-            await notify_status_change(self.id, old, new)
+@listens_for(Order)  # all events
+async def on_any_order_event(
+    order: Order, event_type: ModelEvent, changes: dict | None
+):
+    await audit_log(order.id, event_type)
 ```
 
-#### Field changes format
+### Field changes format
 
-The `changes` dict maps each watched field that changed to `{"old": ..., "new": ...}`. Only fields that actually changed are included:
+The `changes` dict maps each watched field that changed to `{"old": ..., "new": ...}`. Only fields that actually changed are included. For `CREATE` and `DELETE` events, `changes` is `None`:
 
 ```python
+# CREATE / DELETE → changes is None
 # status changed   → {"status": {"old": "pending", "new": "shipped"}}
 # two fields changed → {"status": {...}, "assigned_to": {...}}
 ```
 
 !!! info "Multiple flushes in one transaction are merged: the earliest `old` and latest `new` are preserved, and `on_update` fires only once per commit."
 
-!!! warning "Callbacks fire only for ORM-level changes. Rows updated via raw SQL (`UPDATE ... SET ...`) are not detected."
-
-## Composing mixins
-
-All mixins can be combined in any order. The only constraint is that exactly one primary key must be defined — either via `UUIDMixin` or directly on the model.
-
-```python
-from fastapi_toolsets.models import UUIDMixin, TimestampMixin
-
-class Event(Base, UUIDMixin, TimestampMixin):
-    __tablename__ = "events"
-    name: Mapped[str]
-
-class Counter(Base, UpdatedAtMixin):
-    __tablename__ = "counters"
-    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
-    value: Mapped[int]
-```
-
 ---
 
 [:material-api: API Reference](../reference/models.md)

docs/module/pytest.md

@@ -1,6 +1,6 @@
 # Pytest
 
-Testing helpers for FastAPI applications with async client, database sessions, and parallel worker support.
+Testing helpers for FastAPI applications: async HTTP client, database sessions, and parallel worker support.
 
 ## Installation
 
@@ -14,17 +14,14 @@ Testing helpers for FastAPI applications with async client, database sessions, a
     pip install "fastapi-toolsets[pytest]"
     ```
 
-## Overview
+## Async client
 
-The `pytest` module provides utilities for setting up async test clients, managing test database sessions, and supporting parallel test execution with `pytest-xdist`.
-
-## Creating an async client
-
-Use [`create_async_client`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_async_client) to get an `httpx.AsyncClient` configured for your FastAPI app:
+Use [`create_async_client`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_async_client) to get an `httpx.AsyncClient` bound to your FastAPI app:
 
 ```python
 from fastapi_toolsets.pytest import create_async_client
 
+
 @pytest.fixture
 async def http_client(db_session):
     async def _override_get_db():
@@ -38,13 +35,25 @@ async def http_client(db_session):
         yield c
 ```
 
-## Database sessions in tests
+Any extra keyword arguments are forwarded to `httpx.AsyncClient`, so you can set default headers, authentication, timeouts, and more:
 
-Use [`create_db_session`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_db_session) to create an isolated `AsyncSession` for a test, combined with [`create_worker_database`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_worker_database) to set up a per-worker database:
+```python
+async with create_async_client(
+    app=app,
+    headers={"X-Api-Key": "secret"},
+    timeout=10,
+) as c:
+    ...
+```
+
+## Database sessions
+
+Use [`create_worker_database`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_worker_database) + [`create_db_session`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_db_session) to get a fully isolated `AsyncSession` for each test:
 
 ```python
 from fastapi_toolsets.pytest import create_worker_database, create_db_session
 
+
 @pytest.fixture(scope="session")
 async def worker_db_url():
     async with create_worker_database(
@@ -61,31 +70,56 @@ async def db_session(worker_db_url):
         yield session
 ```
 
+`create_worker_database` connects without specifying a database (asyncpg falls back to the username), so the target test database does not need to exist beforehand.
+
 !!! info
-    In this example, the database is reset between each test using the argument `cleanup=True`.
+    `cleanup=True` truncates all tables between tests via `TRUNCATE … RESTART IDENTITY CASCADE`, which is faster than dropping and recreating tables.
+
+### Engine and session options
+
+Pass `engine_kwargs` or `session_kwargs` to forward options to the underlying SQLAlchemy primitives:
+
+```python
+async with create_db_session(
+    database_url=worker_db_url,
+    base=Base,
+    engine_kwargs={"pool_size": 5, "connect_args": {"timeout": 10}},
+    session_kwargs={"autoflush": False},
+) as session:
+    ...
+```
+
+## Parallel testing with pytest-xdist
+
+The fixtures above work with `pytest-xdist` out of the box. Each worker gets its own database named after the worker (e.g. `gw0`, `gw1`). Pass `prefix` to namespace the database (e.g. `prefix="myapp"` → `myapp_gw0`).
 
 Use [`worker_database_url`](../reference/pytest.md#fastapi_toolsets.pytest.utils.worker_database_url) to derive the per-worker URL manually if needed:
 
 ```python
 from fastapi_toolsets.pytest import worker_database_url
 
-url = worker_database_url("postgresql+asyncpg://user:pass@localhost/test_db", default_test_db="test")
-# e.g. "postgresql+asyncpg://user:pass@localhost/test_db_gw0" under xdist
+url = worker_database_url(
+    "postgresql+asyncpg://user:pass@localhost/myapp", default_test_db="test"
+)
+# → "postgresql+asyncpg://user:pass@localhost/gw0" under xdist
+# → "postgresql+asyncpg://user:pass@localhost/test" otherwise
+
+url = worker_database_url(
+    "postgresql+asyncpg://user:pass@localhost/myapp",
+    default_test_db="test",
+    prefix="myapp",
+)
+# → "postgresql+asyncpg://user:pass@localhost/myapp_gw0" under xdist
+# → "postgresql+asyncpg://user:pass@localhost/myapp_test" otherwise
 ```
 
-## Parallel testing with pytest-xdist
+## Manual table cleanup
 
-The examples above are already compatible with parallel test execution with `pytest-xdist`.
-
-## Cleaning up tables
-
-!!! warning
-    Since `V2.1.0` `cleanup_tables` now live in `fastapi_toolsets.db`. For backward compatibility the function is still available in `fastapi_toolsets.pytest`, but this will be remove in `V3.0.0`.
-
-If you want to manually clean up a database you can use [`cleanup_tables`](../reference/db.md#fastapi_toolsets.db.cleanup_tables), this will truncate all tables between tests for fast isolation:
+[`cleanup_tables`](../reference/db.md#fastapi_toolsets.db.testing.cleanup_tables) truncates all tables in a single statement and can be called directly when you need more control:
 
 ```python
-from fastapi_toolsets.db import cleanup_tables
+from fastapi_toolsets.pytest import cleanup_tables
+
 
 @pytest.fixture(autouse=True)
 async def clean(db_session):

docs/module/schemas.md

@@ -15,6 +15,7 @@ The most common wrapper for a single resource response.
 ```python
 from fastapi_toolsets.schemas import Response
 
+
 @router.get("/users/{id}")
 async def get_user(user: User = UserDep) -> Response[UserSchema]:
     return Response(data=user, message="User retrieved")
@@ -39,6 +40,7 @@ Use as the return type when the endpoint always uses [`offset_paginate`](crud.md
 ```python
 from fastapi_toolsets.schemas import OffsetPaginatedResponse
 
+
 @router.get("/users")
 async def list_users(
     page: int = 1,
@@ -74,6 +76,7 @@ Use as the return type when the endpoint always uses [`cursor_paginate`](crud.md
 ```python
 from fastapi_toolsets.schemas import CursorPaginatedResponse
 
+
 @router.get("/events")
 async def list_events(
     cursor: str | None = None,
@@ -102,7 +105,7 @@ async def list_events(
 
 #### [`PaginatedResponse[T]`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse)
 
-Return type for endpoints that support **both** pagination strategies via a `pagination_type` query parameter (using [`paginate()`](crud.md#unified-paginate--both-strategies-on-one-endpoint)).
+Return type for endpoints that support **both** pagination strategies via a `pagination_type` query parameter (using [`paginate()`](crud.md#unified-endpoint-both-strategies)).
 
 When used as a return annotation, `PaginatedResponse[T]` automatically expands to `Annotated[Union[CursorPaginatedResponse[T], OffsetPaginatedResponse[T]], Field(discriminator="pagination_type")]`, so FastAPI emits a proper `oneOf` + discriminator in the OpenAPI schema with no extra boilerplate:
 
@@ -110,6 +113,7 @@ When used as a return annotation, `PaginatedResponse[T]` automatically expands t
 from fastapi_toolsets.crud import PaginationType
 from fastapi_toolsets.schemas import PaginatedResponse
 
+
 @router.get("/users")
 async def list_users(
     pagination_type: PaginationType = PaginationType.OFFSET,
@@ -129,7 +133,7 @@ async def list_users(
 
 #### Pagination metadata models
 
-The optional `filter_attributes` field is populated when `facet_fields` are configured on the CRUD class (see [Filter attributes](crud.md#filter-attributes-facets)). It is `None` by default and can be hidden from API responses with `response_model_exclude_none=True`.
+The optional `filter_attributes` field is populated when `facet_fields` are configured on the CRUD class (see [Filter attributes](crud.md#faceted-search)). It is `None` by default and can be hidden from API responses with `response_model_exclude_none=True`.
 
 ### [`ErrorResponse`](../reference/schemas.md#fastapi_toolsets.schemas.ErrorResponse)
 

docs/reference/crud.md

@@ -6,7 +6,11 @@ You can import the main symbols from `fastapi_toolsets.crud`:
 
 ```python
 from fastapi_toolsets.crud import CrudFactory, AsyncCrud
-from fastapi_toolsets.crud.search import SearchConfig, get_searchable_fields, build_search_filters
+from fastapi_toolsets.crud.search import (
+    SearchConfig,
+    get_searchable_fields,
+    build_search_filters,
+)
 ```
 
 ## ::: fastapi_toolsets.crud.factory.AsyncCrud

docs/reference/db.md

@@ -1,34 +1,48 @@
 # `db`
 
-Here's the reference for all database session utilities, transaction helpers, and locking functions.
+Here's the reference for the `Database` facade, the transaction helper, locking
+functions, many-to-many helpers, and row-watching utilities.
 
 You can import them directly from `fastapi_toolsets.db`:
 
 ```python
 from fastapi_toolsets.db import (
+    Database,
     LockMode,
-    cleanup_tables,
-    create_database,
-    create_db_dependency,
-    create_db_context,
-    get_transaction,
+    advisory_lock,
     lock_tables,
+    m2m_add,
+    m2m_remove,
+    m2m_set,
+    transaction,
     wait_for_row_change,
 )
 ```
 
+## ::: fastapi_toolsets.db.Database
+
+## ::: fastapi_toolsets.db.transaction
+
 ## ::: fastapi_toolsets.db.LockMode
 
-## ::: fastapi_toolsets.db.create_db_dependency
-
-## ::: fastapi_toolsets.db.create_db_context
-
-## ::: fastapi_toolsets.db.get_transaction
-
 ## ::: fastapi_toolsets.db.lock_tables
 
+## ::: fastapi_toolsets.db.advisory_lock
+
+## ::: fastapi_toolsets.db.m2m_add
+
+## ::: fastapi_toolsets.db.m2m_remove
+
+## ::: fastapi_toolsets.db.m2m_set
+
 ## ::: fastapi_toolsets.db.wait_for_row_change
 
-## ::: fastapi_toolsets.db.create_database
+Admin and test helpers live in `fastapi_toolsets.db.testing`:
 
-## ::: fastapi_toolsets.db.cleanup_tables
+```python
+from fastapi_toolsets.db.testing import cleanup_tables, create_database
+```
+
+## ::: fastapi_toolsets.db.testing.create_database
+
+## ::: fastapi_toolsets.db.testing.cleanup_tables

docs/reference/exceptions.md

@@ -12,8 +12,11 @@ from fastapi_toolsets.exceptions import (
     NotFoundError,
     ConflictError,
     NoSearchableFieldsError,
+    InvalidSearchColumnError,
     InvalidFacetFilterError,
     InvalidOrderFieldError,
+    PoolExhaustedError,
+    LockTimeoutError,
     generate_error_responses,
     init_exceptions_handlers,
 )
@@ -31,10 +34,16 @@ from fastapi_toolsets.exceptions import (
 
 ## ::: fastapi_toolsets.exceptions.exceptions.NoSearchableFieldsError
 
+## ::: fastapi_toolsets.exceptions.exceptions.InvalidSearchColumnError
+
 ## ::: fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError
 
 ## ::: fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError
 
+## ::: fastapi_toolsets.exceptions.exceptions.PoolExhaustedError
+
+## ::: fastapi_toolsets.exceptions.exceptions.LockTimeoutError
+
 ## ::: fastapi_toolsets.exceptions.exceptions.generate_error_responses
 
 ## ::: fastapi_toolsets.exceptions.handler.init_exceptions_handlers

docs/reference/fixtures.md

@@ -12,7 +12,6 @@ from fastapi_toolsets.fixtures import (
     FixtureRegistry,
     load_fixtures,
     load_fixtures_by_context,
-    get_obj_by_attr,
 )
 ```
 
@@ -27,5 +26,3 @@ from fastapi_toolsets.fixtures import (
 ## ::: fastapi_toolsets.fixtures.utils.load_fixtures
 
 ## ::: fastapi_toolsets.fixtures.utils.load_fixtures_by_context
-
-## ::: fastapi_toolsets.fixtures.utils.get_obj_by_attr

docs/reference/models.md

@@ -6,17 +6,19 @@ You can import them directly from `fastapi_toolsets.models`:
 
 ```python
 from fastapi_toolsets.models import (
+    EventSession,
     ModelEvent,
     UUIDMixin,
     UUIDv7Mixin,
     CreatedAtMixin,
     UpdatedAtMixin,
     TimestampMixin,
-    WatchedFieldsMixin,
-    watch,
+    listens_for,
 )
 ```
 
+## ::: fastapi_toolsets.models.EventSession
+
 ## ::: fastapi_toolsets.models.ModelEvent
 
 ## ::: fastapi_toolsets.models.UUIDMixin
@@ -29,6 +31,4 @@ from fastapi_toolsets.models import (
 
 ## ::: fastapi_toolsets.models.TimestampMixin
 
-## ::: fastapi_toolsets.models.WatchedFieldsMixin
-
-## ::: fastapi_toolsets.models.watch
+## ::: fastapi_toolsets.models.listens_for

docs_src/examples/pagination_search/app.py

@@ -2,8 +2,10 @@ from fastapi import FastAPI
 
 from fastapi_toolsets.exceptions import init_exceptions_handlers
 
+from .db import db
 from .routes import router
 
 app = FastAPI()
+db.install(app=app)
 init_exceptions_handlers(app=app)
 app.include_router(router=router)

docs_src/examples/pagination_search/db.py

@@ -1,17 +1,14 @@
 from typing import Annotated
 
 from fastapi import Depends
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.ext.asyncio import AsyncSession
 
-from fastapi_toolsets.db import create_db_context, create_db_dependency
+from fastapi_toolsets.db import Database
 
 DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost:5432/postgres"
 
-engine = create_async_engine(url=DATABASE_URL, future=True)
-async_session_maker = async_sessionmaker(bind=engine, expire_on_commit=False)
+db = Database(url=DATABASE_URL)
 
-get_db = create_db_dependency(session_maker=async_session_maker)
-get_db_context = create_db_context(session_maker=async_session_maker)
+get_db = db
 
-
-SessionDep = Annotated[AsyncSession, Depends(get_db)]
+SessionDep = Annotated[AsyncSession, Depends(db)]

docs_src/examples/pagination_search/routes.py

@@ -1,8 +1,7 @@
 from typing import Annotated
 
-from fastapi import APIRouter, Depends, Query
+from fastapi import APIRouter, Depends
 
-from fastapi_toolsets.crud import OrderByClause, PaginationType
 from fastapi_toolsets.schemas import (
     CursorPaginatedResponse,
     OffsetPaginatedResponse,
@@ -20,22 +19,20 @@ router = APIRouter(prefix="/articles")
 @router.get("/offset")
 async def list_articles_offset(
     session: SessionDep,
-    filter_by: Annotated[dict[str, list[str]], Depends(ArticleCrud.filter_params())],
-    order_by: Annotated[
-        OrderByClause | None,
-        Depends(ArticleCrud.order_params(default_field=Article.created_at)),
+    params: Annotated[
+        dict,
+        Depends(
+            ArticleCrud.offset_paginate_params(
+                default_page_size=20,
+                max_page_size=100,
+                default_order_field=Article.created_at,
+            )
+        ),
     ],
-    page: int = Query(1, ge=1),
-    items_per_page: int = Query(20, ge=1, le=100),
-    search: str | None = None,
 ) -> OffsetPaginatedResponse[ArticleRead]:
     return await ArticleCrud.offset_paginate(
         session=session,
-        page=page,
-        items_per_page=items_per_page,
-        search=search,
-        filter_by=filter_by or None,
-        order_by=order_by,
+        **params,
         schema=ArticleRead,
     )
 
@@ -43,22 +40,20 @@ async def list_articles_offset(
 @router.get("/cursor")
 async def list_articles_cursor(
     session: SessionDep,
-    filter_by: Annotated[dict[str, list[str]], Depends(ArticleCrud.filter_params())],
-    order_by: Annotated[
-        OrderByClause | None,
-        Depends(ArticleCrud.order_params(default_field=Article.created_at)),
+    params: Annotated[
+        dict,
+        Depends(
+            ArticleCrud.cursor_paginate_params(
+                default_page_size=20,
+                max_page_size=100,
+                default_order_field=Article.created_at,
+            )
+        ),
     ],
-    cursor: str | None = None,
-    items_per_page: int = Query(20, ge=1, le=100),
-    search: str | None = None,
 ) -> CursorPaginatedResponse[ArticleRead]:
     return await ArticleCrud.cursor_paginate(
         session=session,
-        cursor=cursor,
-        items_per_page=items_per_page,
-        search=search,
-        filter_by=filter_by or None,
-        order_by=order_by,
+        **params,
         schema=ArticleRead,
     )
 
@@ -66,25 +61,19 @@ async def list_articles_cursor(
 @router.get("/")
 async def list_articles(
     session: SessionDep,
-    filter_by: Annotated[dict[str, list[str]], Depends(ArticleCrud.filter_params())],
-    order_by: Annotated[
-        OrderByClause | None,
-        Depends(ArticleCrud.order_params(default_field=Article.created_at)),
+    params: Annotated[
+        dict,
+        Depends(
+            ArticleCrud.paginate_params(
+                default_page_size=20,
+                max_page_size=100,
+                default_order_field=Article.created_at,
+            )
+        ),
     ],
-    pagination_type: PaginationType = PaginationType.OFFSET,
-    page: int = Query(1, ge=1),
-    cursor: str | None = None,
-    items_per_page: int = Query(20, ge=1, le=100),
-    search: str | None = None,
 ) -> PaginatedResponse[ArticleRead]:
     return await ArticleCrud.paginate(
         session,
-        pagination_type=pagination_type,
-        page=page,
-        cursor=cursor,
-        items_per_page=items_per_page,
-        search=search,
-        filter_by=filter_by or None,
-        order_by=order_by,
+        **params,
         schema=ArticleRead,
     )

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "fastapi-toolsets"
-version = "2.4.0"
+version = "5.1.0"
 description = "Production-ready utilities for FastAPI applications"
 readme = "README.md"
 license = "MIT"
@@ -66,11 +66,14 @@ manager = "fastapi_toolsets.cli.app:cli"
 dev = [
     {include-group = "tests"},
     {include-group = "docs"},
+    {include-group = "docs-src"},
     "fastapi-toolsets[all]",
+    "prek>=0.3.8",
     "ruff>=0.1.0",
     "ty>=0.0.1a0",
 ]
 tests = [
+    "async-lru>=1.0",
     "coverage>=7.0.0",
     "httpx>=0.25.0",
     "pytest-anyio>=0.0.0",
@@ -79,14 +82,30 @@ tests = [
     "pytest>=8.0.0",
 ]
 docs = [
+    "mike",
     "mkdocstrings-python>=2.0.2",
-    "zensical>=0.0.23",
+    "zensical>=0.0.30",
+]
+docs-src = [
+    "bcrypt>=4.0.0",
 ]
 
 [build-system]
-requires = ["uv_build>=0.10,<0.11.0"]
+requires = ["uv_build>=0.10,<0.12.0"]
 build-backend = "uv_build"
 
+[tool.ruff.format]
+exclude = ["*.md"]
+
+[tool.ruff.lint]
+extend-select = ["E712"]
+
+[tool.ruff.lint.flake8-bugbear]
+extend-immutable-calls = ["fastapi.Depends"]
+
+[tool.ruff.lint.per-file-ignores]
+"tests/**" = ["RUF012", "RUF059", "SIM117", "DTZ001", "S110", "BLE001"]
+
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 filterwarnings = [
@@ -103,3 +122,6 @@ exclude_lines = [
     "if TYPE_CHECKING:",
     "raise NotImplementedError",
 ]
+
+[tool.uv.sources]
+mike = { git = "https://github.com/squidfunk/mike.git", tag = "2.2.0+zensical-0.1.0" }

src/fastapi_toolsets/__init__.py

@@ -7,18 +7,21 @@ Example usage:
     from fastapi import FastAPI, Depends
     from fastapi_toolsets.exceptions import init_exceptions_handlers
     from fastapi_toolsets.crud import CrudFactory
-    from fastapi_toolsets.db import create_db_dependency
+    from fastapi_toolsets.db import Database
     from fastapi_toolsets.schemas import Response
 
+    db = Database("postgresql+asyncpg://postgres:postgres@localhost/app")
+
     app = FastAPI()
+    db.install(app)
     init_exceptions_handlers(app)
 
     UserCrud = CrudFactory(User)
 
     @app.get("/users/{user_id}", response_model=Response[dict])
-    async def get_user(user_id: int, session = Depends(get_db)):
+    async def get_user(user_id: int, session = Depends(db)):
         user = await UserCrud.get(session, [User.id == user_id])
         return Response(data={"user": user.username}, message="Success")
 """
 
-__version__ = "2.4.0"
+__version__ = "5.1.0"

src/fastapi_toolsets/cli/commands/fixtures.py

@@ -6,7 +6,8 @@ import typer
 from rich.console import Console
 from rich.table import Table
 
-from ...fixtures import Context, LoadStrategy, load_fixtures_by_context
+from ...fixtures import Context, LoadStrategy
+from ...logger import get_logger
 from ..config import get_db_context, get_fixtures_registry
 from ..utils import async_command
 
@@ -16,13 +17,14 @@ fixture_cli = typer.Typer(
     no_args_is_help=True,
 )
 console = Console()
+logger = get_logger()
 
 
 @fixture_cli.command("list")
 def list_fixtures(
     ctx: typer.Context,
     context: Annotated[
-        Context | None,
+        str | None,
         typer.Option(
             "--context",
             "-c",
@@ -32,10 +34,10 @@ def list_fixtures(
 ) -> None:
     """List all registered fixtures."""
     registry = get_fixtures_registry()
-    fixtures = registry.get_by_context(context.value) if context else registry.get_all()
+    fixtures = registry.get_by_context(context) if context else registry.get_all()
 
     if not fixtures:
-        print("No fixtures found.")
+        logger.info("No fixtures found.")
         return
 
     table = Table("Name", "Contexts", "Dependencies")
@@ -46,7 +48,7 @@ def list_fixtures(
         table.add_row(fixture.name, contexts, deps)
 
     console.print(table)
-    print(f"\nTotal: {len(fixtures)} fixture(s)")
+    logger.info("Total: %d fixture(s)", len(fixtures))
 
 
 @fixture_cli.command("load")
@@ -54,8 +56,8 @@ def list_fixtures(
 async def load(
     ctx: typer.Context,
     contexts: Annotated[
-        list[Context] | None,
-        typer.Argument(help="Contexts to load."),
+        list[str] | None,
+        typer.Argument(help="Contexts to load.", envvar="FIXTURES_CONTEXT"),
     ] = None,
     strategy: Annotated[
         LoadStrategy,
@@ -69,26 +71,27 @@ async def load(
     ] = False,
 ) -> None:
     """Load fixtures into the database."""
+    from ...fixtures import load_fixtures_by_context
+
     registry = get_fixtures_registry()
     db_context = get_db_context()
 
-    context_list = list(contexts) if contexts else [Context.BASE]
+    context_list = contexts or [Context.BASE.value]
 
     ordered = registry.resolve_context_dependencies(*context_list)
 
     if not ordered:
-        print("No fixtures to load for the specified context(s).")
+        logger.info("No fixtures to load for the specified context(s).")
         return
 
-    print(f"\nFixtures to load ({strategy.value} strategy):")
-    for name in ordered:
-        fixture = registry.get(name)
-        instances = list(fixture.func())
-        model_name = type(instances[0]).__name__ if instances else "?"
-        print(f"  - {name}: {len(instances)} {model_name}(s)")
-
     if dry_run:
-        print("\n[Dry run - no changes made]")
+        logger.info("Fixtures to load (%s strategy):", strategy.value)
+        for name in ordered:
+            variants = registry.get_load_variants(name, *context_list)
+            instances = [inst for v in variants for inst in v.func()]
+            model_name = type(instances[0]).__name__ if instances else "?"
+            logger.info("  - %s: %d %s(s)", name, len(instances), model_name)
+        logger.info("[Dry run - no changes made]")
         return
 
     async with db_context() as session:
@@ -97,4 +100,4 @@ async def load(
         )
 
     total = sum(len(items) for items in result.values())
-    print(f"\nLoaded {total} record(s) successfully.")
+    logger.info("Loaded %d record(s) successfully.", total)

src/fastapi_toolsets/cli/config.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import importlib
 import sys
-from typing import TYPE_CHECKING, Any, Literal, overload
+from typing import TYPE_CHECKING, Any, Literal, TypeVar, overload
 
 import typer
 
@@ -13,6 +13,8 @@ from .pyproject import find_pyproject, load_pyproject
 if TYPE_CHECKING:
     from ..fixtures import FixtureRegistry
 
+T = TypeVar("T")
+
 
 def _ensure_project_in_path():
     """Add project root to sys.path if not installed in editable mode."""
@@ -88,19 +90,39 @@ def get_config_value(key: str, required: bool = False) -> Any | None:
     return value
 
 
+@overload
+def _import_typed(
+    key: str, expected_type: type[T], *, required: Literal[True]
+) -> T: ...  # pragma: no cover
+@overload
+def _import_typed(
+    key: str, expected_type: type[T], *, required: bool
+) -> T | None: ...  # pragma: no cover
+def _import_typed(key: str, expected_type: type[T], *, required: bool) -> T | None:
+    """Import a config value by key and validate its type.
+
+    Raises:
+        typer.BadParameter: If required and missing, or if the imported
+            value isn't an instance of *expected_type*.
+    """
+    import_path = get_config_value(key, required=required)
+    if not import_path:
+        return None
+
+    obj = import_from_string(import_path)
+    if not isinstance(obj, expected_type):
+        raise typer.BadParameter(
+            f"'{key}' must be a {expected_type.__name__} instance, got {type(obj).__name__}"
+        )
+
+    return obj
+
+
 def get_fixtures_registry() -> FixtureRegistry:
     """Import and return the fixtures registry from config."""
     from ..fixtures import FixtureRegistry
 
-    import_path = get_config_value("fixtures", required=True)
-    registry = import_from_string(import_path)
-
-    if not isinstance(registry, FixtureRegistry):
-        raise typer.BadParameter(
-            f"'fixtures' must be a FixtureRegistry instance, got {type(registry).__name__}"
-        )
-
-    return registry
+    return _import_typed("fixtures", FixtureRegistry, required=True)
 
 
 def get_db_context() -> Any:
@@ -111,15 +133,4 @@ def get_db_context() -> Any:
 
 def get_custom_cli() -> typer.Typer | None:
     """Import and return the custom CLI Typer instance from config."""
-    import_path = get_config_value("custom_cli")
-    if not import_path:
-        return None
-
-    custom = import_from_string(import_path)
-
-    if not isinstance(custom, typer.Typer):
-        raise typer.BadParameter(
-            f"'custom_cli' must be a Typer instance, got {type(custom).__name__}"
-        )
-
-    return custom
+    return _import_typed("custom_cli", typer.Typer, required=False)

src/fastapi_toolsets/cli/utils.py

@@ -1,6 +1,5 @@
 """CLI utility functions."""
 
-import asyncio
 import functools
 from collections.abc import Callable, Coroutine
 from typing import Any, ParamSpec, TypeVar
@@ -24,6 +23,8 @@ def async_command(func: Callable[P, Coroutine[Any, Any, T]]) -> Callable[P, T]:
 
     @functools.wraps(func)
     def wrapper(*args: P.args, **kwargs: P.kwargs) -> T:
+        import asyncio
+
         return asyncio.run(func(*args, **kwargs))
 
     return wrapper

src/fastapi_toolsets/crud/__init__.py

@@ -1,12 +1,18 @@
 """Generic async CRUD operations for SQLAlchemy models."""
 
-from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
+from ..exceptions import (
+    InvalidFacetFilterError,
+    InvalidSearchColumnError,
+    NoSearchableFieldsError,
+    UnsupportedFacetTypeError,
+)
 from ..schemas import PaginationType
 from ..types import (
     FacetFieldType,
     JoinType,
     M2MFieldType,
     OrderByClause,
+    OrderFieldType,
     SearchFieldType,
 )
 from .factory import AsyncCrud, CrudFactory
@@ -16,13 +22,16 @@ __all__ = [
     "AsyncCrud",
     "CrudFactory",
     "FacetFieldType",
-    "get_searchable_fields",
     "InvalidFacetFilterError",
+    "InvalidSearchColumnError",
     "JoinType",
     "M2MFieldType",
     "NoSearchableFieldsError",
     "OrderByClause",
+    "OrderFieldType",
     "PaginationType",
     "SearchConfig",
     "SearchFieldType",
+    "UnsupportedFacetTypeError",
+    "get_searchable_fields",
 ]

src/fastapi_toolsets/crud/search.py

@@ -1,18 +1,33 @@
 """Search utilities for AsyncCrud."""
 
-import asyncio
 import functools
-from collections import Counter
 from collections.abc import Sequence
 from dataclasses import dataclass, replace
 from typing import TYPE_CHECKING, Any, Literal
 
-from sqlalchemy import String, and_, or_, select
+from sqlalchemy import String, and_, distinct, func, or_, select
+from sqlalchemy.dialects.postgresql import aggregate_order_by
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 from sqlalchemy.orm.attributes import InstrumentedAttribute
+from sqlalchemy.types import (
+    ARRAY,
+    Boolean,
+    Date,
+    DateTime,
+    Enum,
+    Integer,
+    Numeric,
+    Time,
+    Uuid,
+)
 
-from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
+from ..exceptions import (
+    InvalidFacetFilterError,
+    InvalidSearchColumnError,
+    NoSearchableFieldsError,
+    UnsupportedFacetTypeError,
+)
 from ..types import FacetFieldType, SearchFieldType
 
 if TYPE_CHECKING:
@@ -82,6 +97,7 @@ def build_search_filters(
     search: str | SearchConfig,
     search_fields: Sequence[SearchFieldType] | None = None,
     default_fields: Sequence[SearchFieldType] | None = None,
+    search_column: str | None = None,
 ) -> tuple[list["ColumnElement[bool]"], list[InstrumentedAttribute[Any]]]:
     """Build SQLAlchemy filter conditions for search.
 
@@ -90,6 +106,8 @@ def build_search_filters(
         search: Search string or SearchConfig
         search_fields: Fields specified per-call (takes priority)
         default_fields: Default fields (from ClassVar)
+        search_column: Optional key to narrow search to a single field.
+            Must match one of the resolved search field keys.
 
     Returns:
         Tuple of (filter_conditions, joins_needed)
@@ -116,6 +134,14 @@ def build_search_filters(
     if not fields:
         raise NoSearchableFieldsError(model)
 
+    # Narrow to a single column when search_column is specified
+    if search_column is not None:
+        keys = search_field_keys(fields)
+        index = {k: f for k, f in zip(keys, fields)}
+        if search_column not in index:
+            raise InvalidSearchColumnError(search_column, sorted(index))
+        fields = [index[search_column]]
+
     query = config.query.strip()
     filters: list[ColumnElement[bool]] = []
     joins: list[InstrumentedAttribute[Any]] = []
@@ -133,8 +159,11 @@ def build_search_filters(
         else:
             column = field
 
-        # Build the filter (cast to String for non-text columns)
-        column_as_string = column.cast(String)
+        # Build the filter (cast to String only when needed, to preserve
+        # pg_trgm GIN index usability on already-String columns)
+        column_as_string = (
+            column if isinstance(column.type, String) else column.cast(String)
+        )
         if config.case_sensitive:
             filters.append(column_as_string.like(f"%{query}%"))
         else:
@@ -150,8 +179,28 @@ def build_search_filters(
         return filters, joins
 
 
+def search_field_keys(fields: Sequence[SearchFieldType]) -> list[str]:
+    """Return a human-readable key for each search field."""
+    return facet_keys(fields)
+
+
+def apply_search_joins(q: Any, joins: Sequence[Any]) -> Any:
+    """Apply relationship-based outer joins (from search/filter_by/facets) to a query.
+
+    Deduplicates by relationship identity so a join used by several fields
+    (e.g. search + a facet on the same relation) is only applied once.
+    """
+    seen: set[str] = set()
+    for rel in joins:
+        rel_key = str(rel)
+        if rel_key not in seen:
+            seen.add(rel_key)
+            q = q.outerjoin(rel)
+    return q
+
+
 def facet_keys(facet_fields: Sequence[FacetFieldType]) -> list[str]:
-    """Return a key for each facet field, disambiguating duplicate column keys.
+    """Return a key for each facet field.
 
     Args:
         facet_fields: Sequence of facet fields — either direct columns or
@@ -160,22 +209,12 @@ def facet_keys(facet_fields: Sequence[FacetFieldType]) -> list[str]:
     Returns:
         A list of string keys, one per facet field, in the same order.
     """
-    raw: list[tuple[str, str | None]] = []
+    keys: list[str] = []
     for field in facet_fields:
         if isinstance(field, tuple):
-            rel = field[-2]
-            column = field[-1]
-            raw.append((column.key, rel.key))
+            keys.append("__".join(el.key for el in field))
         else:
-            raw.append((field.key, None))
-
-    counts = Counter(col_key for col_key, _ in raw)
-    keys: list[str] = []
-    for col_key, rel_key in raw:
-        if counts[col_key] > 1 and rel_key is not None:
-            keys.append(f"{rel_key}__{col_key}")
-        else:
-            keys.append(col_key)
+            keys.append(field.key)
     return keys
 
 
@@ -186,6 +225,7 @@ async def build_facets(
     *,
     base_filters: "list[ColumnElement[bool]] | None" = None,
     base_joins: list[InstrumentedAttribute[Any]] | None = None,
+    own_filters: "dict[str, ColumnElement[bool]] | None" = None,
 ) -> dict[str, list[Any]]:
     """Return distinct values for each facet field, respecting current filters.
 
@@ -195,15 +235,24 @@ async def build_facets(
         facet_fields: Columns or relationship tuples to facet on
         base_filters: Filter conditions already applied to the main query (search + caller filters)
         base_joins: Relationship joins already applied to the main query
+        own_filters: Map of facet key -> the ``filter_by`` condition for that
+            same key (if any). Excluded from that facet's own subquery so
+            filtering on a facet doesn't collapse its own value list down to
+            just the filtered value.
 
     Returns:
         Dict mapping column key to sorted list of distinct non-None values
     """
-    existing_join_keys: set[str] = {str(j) for j in (base_joins or [])}
+    if not facet_fields:
+        return {}
 
     keys = facet_keys(facet_fields)
+    own_filters = own_filters or {}
 
-    async def _query_facet(field: FacetFieldType, key: str) -> tuple[str, list[Any]]:
+    scalars: list[Any] = []
+    enum_classes: dict[str, Any] = {}
+
+    for field, key in zip(facet_fields, keys):
         if isinstance(field, tuple):
             # Relationship chain: (User.role, Role.name) — last element is the column
             rels = field[:-1]
@@ -212,35 +261,72 @@ async def build_facets(
             rels = ()
             column = field
 
-        q = select(column).select_from(model).distinct()
+        col_type = column.property.columns[0].type
+        is_array = isinstance(col_type, ARRAY)
+        enum_classes[key] = getattr(col_type, "enum_class", None)
 
-        # Apply base joins (already done on main query, but needed here independently)
-        for rel in base_joins or []:
-            q = q.outerjoin(rel)
+        filters = [
+            *(base_filters or []),
+            *(f for k, f in own_filters.items() if k != key),
+        ]
+        joins = [*(base_joins or []), *rels]
 
-        # Add any extra joins required by this facet field that aren't already in base_joins
-        for rel in rels:
-            if str(rel) not in existing_join_keys:
-                q = q.outerjoin(rel)
+        if is_array:
+            unnested = apply_search_joins(
+                select(func.unnest(column).label("v")).select_from(model), joins
+            )
+            if filters:
+                unnested = unnested.where(and_(*filters))
+            unnested_sq = unnested.subquery()
+            v = unnested_sq.c.v
+            agg = (
+                select(func.array_agg(aggregate_order_by(distinct(v), v)))
+                .select_from(unnested_sq)
+                .where(v.isnot(None))
+            )
+        else:
+            agg = apply_search_joins(
+                select(
+                    func.array_agg(aggregate_order_by(distinct(column), column))
+                ).select_from(model),
+                joins,
+            )
+            agg = agg.where(and_(*filters, column.isnot(None)))
 
-        if base_filters:
-            q = q.where(and_(*base_filters))
+        scalars.append(agg.scalar_subquery().label(key))
 
-        q = q.order_by(column)
-        result = await session.execute(q)
-        values = [row[0] for row in result.all() if row[0] is not None]
-        return key, values
+    row = (await session.execute(select(*scalars))).one()
 
-    pairs = await asyncio.gather(
-        *[_query_facet(f, k) for f, k in zip(facet_fields, keys)]
-    )
-    return dict(pairs)
+    facets: dict[str, list[Any]] = {}
+    for key, values in zip(keys, row):
+        enum_class = enum_classes[key]
+        facets[key] = [
+            v.name if (enum_class is not None and isinstance(v, enum_class)) else v
+            for v in (values or [])
+        ]
+    return facets
+
+
+_EQUALITY_TYPES = (String, Integer, Numeric, Date, DateTime, Time, Enum, Uuid)
+"""Column types that support equality / IN filtering in build_filter_by."""
+
+
+def _coerce_bool(value: Any) -> bool:
+    """Coerce a string value to a Python bool for Boolean column filtering."""
+    if isinstance(value, bool):
+        return value
+    if isinstance(value, str):
+        if value.lower() == "true":
+            return True
+        if value.lower() == "false":
+            return False
+    raise ValueError(f"Cannot coerce {value!r} to bool")
 
 
 def build_filter_by(
     filter_by: dict[str, Any],
     facet_fields: Sequence[FacetFieldType],
-) -> tuple["list[ColumnElement[bool]]", list[InstrumentedAttribute[Any]]]:
+) -> tuple["dict[str, ColumnElement[bool]]", list[InstrumentedAttribute[Any]]]:
     """Translate a {column_key: value} dict into SQLAlchemy filter conditions.
 
     Args:
@@ -248,7 +334,9 @@ def build_filter_by(
         facet_fields: Declared facet fields to validate keys against
 
     Returns:
-        Tuple of (filter_conditions, joins_needed)
+        Tuple of ({facet_key: filter_condition}, joins_needed). One filter
+        condition per key, so callers can identify (and exclude) a facet's
+        own filter when computing that facet's distinct values.
 
     Raises:
         InvalidFacetFilterError: If a key in filter_by is not a declared facet field
@@ -266,7 +354,7 @@ def build_filter_by(
         index[key] = (column, rels)
 
     valid_keys = set(index)
-    filters: list[ColumnElement[bool]] = []
+    filters: dict[str, ColumnElement[bool]] = {}
     joins: list[InstrumentedAttribute[Any]] = []
     added_join_keys: set[str] = set()
 
@@ -282,9 +370,42 @@ def build_filter_by(
                 joins.append(rel)
                 added_join_keys.add(rel_key)
 
-        if isinstance(value, list):
-            filters.append(column.in_(value))
+        col_type = column.property.columns[0].type
+        if isinstance(col_type, Boolean):
+            coerce = _coerce_bool
+            if isinstance(value, list):
+                filters[key] = column.in_([coerce(v) for v in value])
+            else:
+                filters[key] = column == coerce(value)
+        elif isinstance(col_type, ARRAY):
+            if isinstance(value, list):
+                filters[key] = column.overlap(value)
+            else:
+                filters[key] = column.any(value)
+        elif isinstance(col_type, Enum):
+            enum_class = col_type.enum_class
+            if enum_class is not None:
+
+                def _coerce_enum(v: Any, enum_class: Any = enum_class) -> Any:
+                    if isinstance(v, enum_class):
+                        return v
+                    return enum_class[v]  # lookup by name: "PENDING", "RED"
+
+                if isinstance(value, list):
+                    filters[key] = column.in_([_coerce_enum(v) for v in value])
+                else:
+                    filters[key] = column == _coerce_enum(value)
+            else:  # pragma: no cover
+                if isinstance(value, list):
+                    filters[key] = column.in_(value)
+                else:
+                    filters[key] = column == value
+        elif isinstance(col_type, _EQUALITY_TYPES):
+            if isinstance(value, list):
+                filters[key] = column.in_(value)
+            else:
+                filters[key] = column == value
         else:
-            filters.append(column == value)
+            raise UnsupportedFacetTypeError(key, type(col_type).__name__)
 
     return filters, joins

src/fastapi_toolsets/db.py

@@ -1,337 +0,0 @@
-"""Database utilities: sessions, transactions, and locks."""
-
-import asyncio
-from collections.abc import AsyncGenerator, Callable
-from contextlib import AbstractAsyncContextManager, asynccontextmanager
-from enum import Enum
-from typing import Any, TypeVar
-
-from sqlalchemy import text
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
-from sqlalchemy.orm import DeclarativeBase
-
-from .exceptions import NotFoundError
-
-__all__ = [
-    "LockMode",
-    "cleanup_tables",
-    "create_database",
-    "create_db_context",
-    "create_db_dependency",
-    "get_transaction",
-    "lock_tables",
-    "wait_for_row_change",
-]
-
-
-def create_db_dependency(
-    session_maker: async_sessionmaker[AsyncSession],
-) -> Callable[[], AsyncGenerator[AsyncSession, None]]:
-    """Create a FastAPI dependency for database sessions.
-
-    Creates a dependency function that yields a session and auto-commits
-    if a transaction is active when the request completes.
-
-    Args:
-        session_maker: Async session factory from create_session_factory()
-
-    Returns:
-        An async generator function usable with FastAPI's Depends()
-
-    Example:
-        ```python
-        from fastapi import Depends
-        from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
-        from fastapi_toolsets.db import create_db_dependency
-
-        engine = create_async_engine("postgresql+asyncpg://...")
-        SessionLocal = async_sessionmaker(engine, expire_on_commit=False)
-        get_db = create_db_dependency(SessionLocal)
-
-        @app.get("/users")
-        async def list_users(session: AsyncSession = Depends(get_db)):
-            ...
-        ```
-    """
-
-    async def get_db() -> AsyncGenerator[AsyncSession, None]:
-        async with session_maker() as session:
-            yield session
-            if session.in_transaction():
-                await session.commit()
-
-    return get_db
-
-
-def create_db_context(
-    session_maker: async_sessionmaker[AsyncSession],
-) -> Callable[[], AbstractAsyncContextManager[AsyncSession]]:
-    """Create a context manager for database sessions.
-
-    Creates a context manager for use outside of FastAPI request handlers,
-    such as in background tasks, CLI commands, or tests.
-
-    Args:
-        session_maker: Async session factory from create_session_factory()
-
-    Returns:
-        An async context manager function
-
-    Example:
-        ```python
-        from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
-        from fastapi_toolsets.db import create_db_context
-
-        engine = create_async_engine("postgresql+asyncpg://...")
-        SessionLocal = async_sessionmaker(engine, expire_on_commit=False)
-        get_db_context = create_db_context(SessionLocal)
-
-        async def background_task():
-            async with get_db_context() as session:
-                user = await UserCrud.get(session, [User.id == 1])
-                ...
-        ```
-    """
-    get_db = create_db_dependency(session_maker)
-    return asynccontextmanager(get_db)
-
-
-@asynccontextmanager
-async def get_transaction(
-    session: AsyncSession,
-) -> AsyncGenerator[AsyncSession, None]:
-    """Get a transaction context, handling nested transactions.
-
-    If already in a transaction, creates a savepoint (nested transaction).
-    Otherwise, starts a new transaction.
-
-    Args:
-        session: AsyncSession instance
-
-    Yields:
-        The session within the transaction context
-
-    Example:
-        ```python
-        async with get_transaction(session):
-            session.add(model)
-            # Auto-commits on exit, rolls back on exception
-        ```
-    """
-    if session.in_transaction():
-        async with session.begin_nested():
-            yield session
-    else:
-        async with session.begin():
-            yield session
-
-
-class LockMode(str, Enum):
-    """PostgreSQL table lock modes.
-
-    See: https://www.postgresql.org/docs/current/explicit-locking.html
-    """
-
-    ACCESS_SHARE = "ACCESS SHARE"
-    ROW_SHARE = "ROW SHARE"
-    ROW_EXCLUSIVE = "ROW EXCLUSIVE"
-    SHARE_UPDATE_EXCLUSIVE = "SHARE UPDATE EXCLUSIVE"
-    SHARE = "SHARE"
-    SHARE_ROW_EXCLUSIVE = "SHARE ROW EXCLUSIVE"
-    EXCLUSIVE = "EXCLUSIVE"
-    ACCESS_EXCLUSIVE = "ACCESS EXCLUSIVE"
-
-
-@asynccontextmanager
-async def lock_tables(
-    session: AsyncSession,
-    tables: list[type[DeclarativeBase]],
-    *,
-    mode: LockMode = LockMode.SHARE_UPDATE_EXCLUSIVE,
-    timeout: str = "5s",
-) -> AsyncGenerator[AsyncSession, None]:
-    """Lock PostgreSQL tables for the duration of a transaction.
-
-    Acquires table-level locks that are held until the transaction ends.
-    Useful for preventing concurrent modifications during critical operations.
-
-    Args:
-        session: AsyncSession instance
-        tables: List of SQLAlchemy model classes to lock
-        mode: Lock mode (default: SHARE UPDATE EXCLUSIVE)
-        timeout: Lock timeout (default: "5s")
-
-    Yields:
-        The session with locked tables
-
-    Raises:
-        SQLAlchemyError: If lock cannot be acquired within timeout
-
-    Example:
-        ```python
-        from fastapi_toolsets.db import lock_tables, LockMode
-
-        async with lock_tables(session, [User, Account]):
-            # Tables are locked with SHARE UPDATE EXCLUSIVE mode
-            user = await UserCrud.get(session, [User.id == 1])
-            user.balance += 100
-
-        # With custom lock mode
-        async with lock_tables(session, [Order], mode=LockMode.EXCLUSIVE):
-            # Exclusive lock - no other transactions can access
-            await process_order(session, order_id)
-        ```
-    """
-    table_names = ",".join(table.__tablename__ for table in tables)
-
-    async with get_transaction(session):
-        await session.execute(text(f"SET LOCAL lock_timeout='{timeout}'"))
-        await session.execute(text(f"LOCK {table_names} IN {mode.value} MODE"))
-        yield session
-
-
-async def create_database(
-    db_name: str,
-    *,
-    server_url: str,
-) -> None:
-    """Create a database.
-
-    Connects to *server_url* using ``AUTOCOMMIT`` isolation and issues a
-    ``CREATE DATABASE`` statement for *db_name*.
-
-    Args:
-        db_name: Name of the database to create.
-        server_url: URL used for server-level DDL (must point to an existing
-            database on the same server).
-
-    Example:
-        ```python
-        from fastapi_toolsets.db import create_database
-
-        SERVER_URL = "postgresql+asyncpg://postgres:postgres@localhost/postgres"
-        await create_database("myapp_test", server_url=SERVER_URL)
-        ```
-    """
-    engine = create_async_engine(server_url, isolation_level="AUTOCOMMIT")
-    try:
-        async with engine.connect() as conn:
-            await conn.execute(text(f"CREATE DATABASE {db_name}"))
-    finally:
-        await engine.dispose()
-
-
-async def cleanup_tables(
-    session: AsyncSession,
-    base: type[DeclarativeBase],
-) -> None:
-    """Truncate all tables for fast between-test cleanup.
-
-    Executes a single ``TRUNCATE … RESTART IDENTITY CASCADE`` statement
-    across every table in *base*'s metadata, which is significantly faster
-    than dropping and re-creating tables between tests.
-
-    This is a no-op when the metadata contains no tables.
-
-    Args:
-        session: An active async database session.
-        base: SQLAlchemy DeclarativeBase class containing model metadata.
-
-    Example:
-        ```python
-        @pytest.fixture
-        async def db_session(worker_db_url):
-            async with create_db_session(worker_db_url, Base) as session:
-                yield session
-                await cleanup_tables(session, Base)
-        ```
-    """
-    tables = base.metadata.sorted_tables
-    if not tables:
-        return
-
-    table_names = ", ".join(f'"{t.name}"' for t in tables)
-    await session.execute(text(f"TRUNCATE {table_names} RESTART IDENTITY CASCADE"))
-    await session.commit()
-
-
-_M = TypeVar("_M", bound=DeclarativeBase)
-
-
-async def wait_for_row_change(
-    session: AsyncSession,
-    model: type[_M],
-    pk_value: Any,
-    *,
-    columns: list[str] | None = None,
-    interval: float = 0.5,
-    timeout: float | None = None,
-) -> _M:
-    """Poll a database row until a change is detected.
-
-    Queries the row every ``interval`` seconds and returns the model instance
-    once a change is detected in any column (or only the specified ``columns``).
-
-    Args:
-        session: AsyncSession instance
-        model: SQLAlchemy model class
-        pk_value: Primary key value of the row to watch
-        columns: Optional list of column names to watch. If None, all columns
-                 are watched.
-        interval: Polling interval in seconds (default: 0.5)
-        timeout: Maximum time to wait in seconds. None means wait forever.
-
-    Returns:
-        The refreshed model instance with updated values
-
-    Raises:
-        NotFoundError: If the row does not exist or is deleted during polling
-        TimeoutError: If timeout expires before a change is detected
-
-    Example:
-        ```python
-        from fastapi_toolsets.db import wait_for_row_change
-
-        # Wait for any column to change
-        updated = await wait_for_row_change(session, User, user_id)
-
-        # Watch specific columns with a timeout
-        updated = await wait_for_row_change(
-            session, User, user_id,
-            columns=["status", "email"],
-            interval=1.0,
-            timeout=30.0,
-        )
-        ```
-    """
-    instance = await session.get(model, pk_value)
-    if instance is None:
-        raise NotFoundError(f"{model.__name__} with pk={pk_value!r} not found")
-
-    if columns is not None:
-        watch_cols = columns
-    else:
-        watch_cols = [attr.key for attr in model.__mapper__.column_attrs]
-
-    initial = {col: getattr(instance, col) for col in watch_cols}
-
-    elapsed = 0.0
-    while True:
-        await asyncio.sleep(interval)
-        elapsed += interval
-
-        if timeout is not None and elapsed >= timeout:
-            raise TimeoutError(
-                f"No change detected on {model.__name__} "
-                f"with pk={pk_value!r} within {timeout}s"
-            )
-
-        session.expunge(instance)
-        instance = await session.get(model, pk_value)
-
-        if instance is None:
-            raise NotFoundError(f"{model.__name__} with pk={pk_value!r} was deleted")
-
-        current = {col: getattr(instance, col) for col in watch_cols}
-        if current != initial:
-            return instance

src/fastapi_toolsets/db/__init__.py

@@ -0,0 +1,18 @@
+"""Database package: the ``Database`` facade plus PostgreSQL power-tools."""
+
+from .core import Database, transaction
+from .locks import LockMode, advisory_lock, lock_tables
+from .m2m import m2m_add, m2m_remove, m2m_set
+from .watch import wait_for_row_change
+
+__all__ = [
+    "Database",
+    "LockMode",
+    "advisory_lock",
+    "lock_tables",
+    "m2m_add",
+    "m2m_remove",
+    "m2m_set",
+    "transaction",
+    "wait_for_row_change",
+]

src/fastapi_toolsets/db/core.py

@@ -0,0 +1,322 @@
+"""The ``Database`` facade: session lifecycle, dependency, middleware, transactions."""
+
+from collections.abc import AsyncGenerator
+from contextlib import AbstractAsyncContextManager, asynccontextmanager
+from typing import Any
+
+from pydantic import PostgresDsn
+from sqlalchemy import exc as sa_exc
+from sqlalchemy.ext.asyncio import (
+    AsyncEngine,
+    AsyncSession,
+    async_sessionmaker,
+    create_async_engine,
+)
+from sqlalchemy.orm import DeclarativeBase
+from starlette.requests import Request
+from starlette.types import ASGIApp, Message, Receive, Scope, Send
+
+from ..exceptions import PoolExhaustedError
+from .locks import LockMode, lock_tables
+
+
+@asynccontextmanager
+async def transaction(
+    session: AsyncSession,
+) -> AsyncGenerator[AsyncSession, None]:
+    """Run a block inside a savepoint-aware transaction.
+
+    If *session* is already in a transaction, a nested transaction (savepoint)
+    is opened so the block can roll back independently. Otherwise a top-level
+    transaction is started. Commits on clean exit, rolls back on exception.
+
+    Args:
+        session: AsyncSession instance.
+
+    Yields:
+        The session within the transaction context.
+
+    Example:
+        ```python
+        from fastapi_toolsets.db import transaction
+
+        async with transaction(session):
+            session.add(model)
+        ```
+    """
+    if session.in_transaction():
+        async with session.begin_nested():
+            yield session
+    else:
+        async with session.begin():
+            yield session
+
+
+class _CommitOnResponseMiddleware:
+    """Commit the request's DB session before the response is sent."""
+
+    def __init__(self, app: ASGIApp, *, state_attr: str) -> None:
+        self.app = app
+        self.state_attr = state_attr
+
+    async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
+        if scope["type"] != "http":
+            await self.app(scope, receive, send)
+            return
+
+        async def send_wrapper(message: Message) -> None:
+            if message["type"] == "http.response.start":
+                # ``scope["state"]`` is the same dict ``request.state`` writes
+                # to, so this is the session stashed by the dependency.
+                state = scope.get("state")
+                session = state.get(self.state_attr) if state else None
+                if session is not None and session.in_transaction():
+                    await session.commit()
+            await send(message)
+
+        await self.app(scope, receive, send_wrapper)
+
+
+class Database:
+    """One object that owns the engine, sessions, dependency, and middleware.
+
+    Provide exactly one of *url* (the facade builds and disposes the engine) or
+    *engine* (an engine you own, e.g. for Alembic or ``event.listen``, left
+    untouched).
+
+    Args:
+        url: Database connection URL. Accepts a plain string or a Pydantic
+            :class:`~pydantic.PostgresDsn`.
+        engine: An existing :class:`AsyncEngine` to reuse instead of *url*.
+        session_class: Session class for the sessionmaker (e.g. ``EventSession``).
+        expire_on_commit: Expire attributes after commit. Defaults to ``False``.
+        autoflush: Autoflush the session before queries. Defaults to ``True``.
+        connect_args: DBAPI-level connection arguments forwarded to
+            :func:`create_async_engine` (URL mode only).
+        **engine_options: Extra keyword arguments forwarded to
+            :func:`create_async_engine` (URL mode only).
+
+    Raises:
+        TypeError: If neither or both of *url* and *engine* are given, or if
+            *connect_args*/*engine_options* are passed together with *engine*.
+
+    Example:
+        ```python
+        from fastapi import Depends, FastAPI
+        from fastapi_toolsets.db import Database
+
+        db = Database("postgresql+asyncpg://postgres:postgres@localhost/app")
+
+        app = FastAPI()
+        db.install(app)
+
+        @app.get("/users/{user_id}")
+        async def get_user(user_id: int, session=Depends(db)):
+            return await UserCrud.get(session, [User.id == user_id])
+        ```
+    """
+
+    def __init__(
+        self,
+        url: str | PostgresDsn | None = None,
+        *,
+        engine: AsyncEngine | None = None,
+        session_class: type[AsyncSession] = AsyncSession,
+        expire_on_commit: bool = False,
+        autoflush: bool = True,
+        connect_args: dict[str, Any] | None = None,
+        **engine_options: Any,
+    ) -> None:
+        if (url is None) == (engine is None):
+            raise TypeError(
+                "Database requires exactly one of 'url' or 'engine' "
+                "(got both or neither)."
+            )
+        if engine is not None and (engine_options or connect_args is not None):
+            raise TypeError(
+                "connect_args/engine_options are only valid in URL mode; "
+                "configure the engine you pass via 'engine=' yourself."
+            )
+
+        if engine is not None:
+            self._owns_engine = False
+            self.engine: AsyncEngine = engine
+        else:
+            assert url is not None  # guaranteed by the XOR check above
+            self._owns_engine = True
+            if connect_args is not None:
+                engine_options["connect_args"] = connect_args
+            # ``PostgresDsn`` (and other URL objects) are not str subclasses, so
+            # coerce to the string form SQLAlchemy expects.
+            self.engine = create_async_engine(str(url), **engine_options)
+        self._sessionmaker: async_sessionmaker[AsyncSession] = async_sessionmaker(
+            self.engine,
+            class_=session_class,
+            expire_on_commit=expire_on_commit,
+            autoflush=autoflush,
+        )
+        # Private, per-instance state attribute; cannot collide with another
+        # Database or be mismatched against the middleware.
+        self._state_attr = f"_ft_db_session_{id(self):x}"
+        self._middleware_installed = False
+        self._disposed = False
+
+    async def _dispose(self) -> None:
+        """Dispose the engine once, only if we own it (idempotent)."""
+        if self._owns_engine and not self._disposed:
+            self._disposed = True
+            await self.engine.dispose()
+
+    @asynccontextmanager
+    async def lifespan(self, app: Any) -> AsyncGenerator[None, None]:
+        """Dispose the engine on shutdown; use as ``FastAPI(lifespan=db.lifespan)``.
+
+        Args:
+            app: The ASGI application (unused; required by the lifespan protocol).
+
+        Yields:
+            Control to the application for its lifetime.
+
+        Example:
+            ```python
+            app = FastAPI(lifespan=db.lifespan)
+            ```
+        """
+        try:
+            yield
+        finally:
+            await self._dispose()
+
+    def install(self, app: Any) -> None:
+        """Wire the commit middleware and engine disposal onto *app*.
+
+        Args:
+            app: The FastAPI/Starlette application to wire.
+
+        Example:
+            ```python
+            @asynccontextmanager
+            async def lifespan(app):
+                ...  # your startup
+                yield
+                ...  # your shutdown
+
+            app = FastAPI(lifespan=lifespan)
+            db.install(app)
+            ```
+        """
+        app.add_middleware(_CommitOnResponseMiddleware, state_attr=self._state_attr)
+        self._middleware_installed = True
+
+        inner_lifespan = app.router.lifespan_context
+
+        @asynccontextmanager
+        async def _composed(app_: Any) -> AsyncGenerator[None, None]:
+            async with self.lifespan(app_), inner_lifespan(app_):
+                yield
+
+        app.router.lifespan_context = _composed
+
+    @asynccontextmanager
+    async def _open(self) -> AsyncGenerator[AsyncSession, None]:
+        """Open a session and eagerly acquire a connection (fail-fast on pool)."""
+        async with self._sessionmaker() as session:
+            try:
+                await session.connection()
+            except sa_exc.TimeoutError as e:
+                raise PoolExhaustedError() from e
+            yield session
+
+    async def __call__(self, request: Request) -> AsyncGenerator[AsyncSession, None]:
+        """FastAPI dependency: yield a session and commit once at the right time.
+
+        Args:
+            request: The incoming request (injected by FastAPI).
+
+        Yields:
+            An AsyncSession for the duration of the request.
+
+        Example:
+            ```python
+            @app.get("/users/{user_id}")
+            async def get_user(user_id: int, session=Depends(db)):
+                return await UserCrud.get(session, [User.id == user_id])
+            ```
+        """
+        async with self._open() as session:
+            setattr(request.state, self._state_attr, session)
+            yield session
+            if not self._middleware_installed and session.in_transaction():
+                await session.commit()
+
+    @asynccontextmanager
+    async def session(self) -> AsyncGenerator[AsyncSession, None]:
+        """Open a session outside request handlers (background tasks, CLI, tests).
+
+        Commits on clean exit, rolls back on exception.
+
+        Yields:
+            An AsyncSession ready for database operations.
+
+        Example:
+            ```python
+            async with db.session() as session:
+                user = await UserCrud.get(session, [User.id == 1])
+            ```
+        """
+        async with self._open() as session:
+            yield session
+            if session.in_transaction():
+                await session.commit()
+
+    @asynccontextmanager
+    async def begin(self) -> AsyncGenerator[AsyncSession, None]:
+        """Open a session already inside a transaction (sugar for the common case).
+
+        Equivalent to ``session()`` + :func:`transaction`. Commits on clean exit,
+        rolls back on exception.
+
+        Yields:
+            An AsyncSession open within a transaction.
+
+        Example:
+            ```python
+            async with db.begin() as session:
+                session.add(User(name="ada"))
+            ```
+        """
+        async with self.session() as session, transaction(session):
+            yield session
+
+    def lock_tables(
+        self,
+        tables: list[type[DeclarativeBase]],
+        *,
+        mode: LockMode = LockMode.SHARE_UPDATE_EXCLUSIVE,
+        timeout: str = "5s",
+    ) -> AbstractAsyncContextManager[AsyncSession]:
+        """Lock PostgreSQL tables for the duration of a dedicated transaction.
+
+        Opens its own session from the facade's sessionmaker, changes are
+        committed when the context exits.
+
+        Args:
+            tables: List of SQLAlchemy model classes to lock.
+            mode: Lock mode (default: ``SHARE UPDATE EXCLUSIVE``).
+            timeout: Lock timeout (default: ``"5s"``).
+
+        Yields:
+            The dedicated session, open within the locked transaction.
+
+        Raises:
+            LockTimeoutError: If the lock cannot be acquired within *timeout*.
+            PoolExhaustedError: If the connection pool is exhausted.
+
+        Example:
+            ```python
+            async with db.lock_tables([User, Account]) as session:
+                user = await UserCrud.get(session, [User.id == 1])
+                user.balance += 100
+            ```
+        """
+        return lock_tables(self._sessionmaker, tables, mode=mode, timeout=timeout)

src/fastapi_toolsets/db/locks.py

@@ -0,0 +1,185 @@
+"""PostgreSQL locking helpers: table locks and advisory locks."""
+
+from collections.abc import AsyncGenerator
+from contextlib import AbstractAsyncContextManager, asynccontextmanager
+from enum import Enum
+from typing import TypeVar
+
+import asyncpg
+from sqlalchemy import exc as sa_exc
+from sqlalchemy import text
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+
+from ..exceptions import LockTimeoutError, PoolExhaustedError
+
+_SessionT = TypeVar("_SessionT", bound=AsyncSession)
+
+
+def _is_lock_not_available(e: sa_exc.DBAPIError) -> bool:
+    return e.orig is not None and isinstance(
+        e.orig.__cause__, asyncpg.exceptions.LockNotAvailableError
+    )
+
+
+class LockMode(str, Enum):
+    """PostgreSQL table lock modes.
+
+    See: https://www.postgresql.org/docs/current/explicit-locking.html
+    """
+
+    ACCESS_SHARE = "ACCESS SHARE"
+    ROW_SHARE = "ROW SHARE"
+    ROW_EXCLUSIVE = "ROW EXCLUSIVE"
+    SHARE_UPDATE_EXCLUSIVE = "SHARE UPDATE EXCLUSIVE"
+    SHARE = "SHARE"
+    SHARE_ROW_EXCLUSIVE = "SHARE ROW EXCLUSIVE"
+    EXCLUSIVE = "EXCLUSIVE"
+    ACCESS_EXCLUSIVE = "ACCESS EXCLUSIVE"
+
+
+def lock_tables(
+    session_maker: async_sessionmaker[_SessionT],
+    tables: list[type[DeclarativeBase]],
+    *,
+    mode: LockMode = LockMode.SHARE_UPDATE_EXCLUSIVE,
+    timeout: str = "5s",
+) -> AbstractAsyncContextManager[_SessionT]:
+    """Lock PostgreSQL tables for the duration of a transaction.
+
+    Prefer the method on a :class:`Database` instance; use this
+    directly only when you manage your own session factory.
+
+    Args:
+        session_maker: Async session factory used to create the dedicated
+            session.
+        tables: List of SQLAlchemy model classes to lock.
+        mode: Lock mode (default: SHARE UPDATE EXCLUSIVE).
+        timeout: Lock timeout (default: "5s").
+
+    Yields:
+        The dedicated session, open within the locked transaction.
+
+    Raises:
+        LockTimeoutError: If the lock cannot be acquired within *timeout*.
+        PoolExhaustedError: If the connection pool is exhausted.
+
+    Example:
+        ```python
+        from fastapi_toolsets.db import lock_tables
+
+        async with lock_tables(session_maker, [User, Account]) as session:
+            user = await UserCrud.get(session, [User.id == 1])
+            user.balance += 100
+        ```
+    """
+    table_names = ",".join(table.__tablename__ for table in tables)
+
+    @asynccontextmanager
+    async def _lock() -> AsyncGenerator[_SessionT, None]:
+        async with session_maker() as session:
+            try:
+                await session.execute(text(f"SET LOCAL lock_timeout='{timeout}'"))
+                await session.execute(text(f"LOCK {table_names} IN {mode.value} MODE"))
+                yield session
+                await session.commit()
+            except sa_exc.TimeoutError as e:
+                await session.rollback()
+                raise PoolExhaustedError(
+                    f"Connection pool exhausted while locking '{table_names}'. "
+                ) from e
+            except sa_exc.DBAPIError as e:
+                await session.rollback()
+                if _is_lock_not_available(e):
+                    raise LockTimeoutError(
+                        f"Lock on '{table_names}' could not be acquired within {timeout}."
+                    ) from e
+                raise  # pragma: no cover
+            except BaseException:
+                await session.rollback()
+                raise
+
+    return _lock()
+
+
+@asynccontextmanager
+async def advisory_lock(
+    session: AsyncSession,
+    key: int | tuple[int, int],
+    *,
+    shared: bool = False,
+    nowait: bool = False,
+    timeout: str | None = None,
+) -> AsyncGenerator[bool, None]:
+    """Acquire a PostgreSQL session-level advisory lock.
+
+    Args:
+        session: AsyncSession instance.
+        key: Lock key, either a single ``int`` (bigint) or a ``(int, int)`` pair for namespacing.
+        shared: Acquire a shared lock (multiple holders allowed). Default is exclusive.
+        nowait: Return ``False`` immediately if the lock is unavailable instead of waiting.
+        timeout: Maximum wait time (e.g. ``"5s"``, ``"500ms"``). Raises ``DBAPIError``
+            if exceeded. Ignored when *nowait* is ``True``.
+
+    Yields:
+        ``True`` if the lock was acquired, ``False`` if *nowait* is ``True`` and the lock
+        is already held.
+
+    Raises:
+        LockTimeoutError: If *timeout* is set and the lock cannot be acquired in time.
+
+    Example:
+        ```python
+        from fastapi_toolsets.db import advisory_lock
+
+        async with advisory_lock(session, 42):
+            ...
+
+        async with advisory_lock(session, 42, nowait=True) as acquired:
+            if not acquired:
+                raise HTTPException(409, "Resource is locked")
+
+        async with advisory_lock(session, 42, timeout="5s"):
+            ...
+
+        async with advisory_lock(session, (1, user_id), shared=True):
+            ...
+        ```
+    """
+    suffix = "_shared" if shared else ""
+    acquire_fn = f"{'pg_try_advisory_lock' if nowait else 'pg_advisory_lock'}{suffix}"
+    release_fn = f"pg_advisory_unlock{suffix}"
+
+    if isinstance(key, tuple):
+        k1, k2 = key
+        args = "CAST(:k1 AS integer), CAST(:k2 AS integer)"
+        params: dict[str, int] = {"k1": k1, "k2": k2}
+    else:
+        args = ":k"
+        params = {"k": key}
+
+    acquire_sql = text(f"SELECT {acquire_fn}({args})")
+    release_sql = text(f"SELECT {release_fn}({args})")
+
+    # Lock management runs raw SQL on the caller's session. Guard it with
+    # ``no_autoflush`` so acquiring or releasing the lock never flushes the
+    # caller's pending ORM changes; SQLAlchemy 2.1 autoflushes on raw
+    # ``text()`` too, where 2.0 did not.
+    try:
+        with session.no_autoflush:
+            if timeout is not None and not nowait:
+                await session.execute(text(f"SET LOCAL lock_timeout='{timeout}'"))
+            result = await session.execute(acquire_sql, params)
+    except sa_exc.DBAPIError as e:
+        if _is_lock_not_available(e):
+            raise LockTimeoutError(
+                f"Advisory lock {key!r} could not be acquired within {timeout}."
+            ) from e
+        raise  # pragma: no cover
+    acquired = result.scalar() if nowait else True
+    try:
+        yield acquired
+    finally:
+        if acquired:
+            with session.no_autoflush:
+                await session.execute(release_sql, params)

src/fastapi_toolsets/db/m2m.py

@@ -0,0 +1,168 @@
+"""Many-to-Many association-table helpers (direct, without loading collections)."""
+
+from typing import Any, cast
+
+from sqlalchemy import ColumnElement, Table, delete, tuple_
+from sqlalchemy.dialects.postgresql import insert as pg_insert
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import DeclarativeBase, QueryableAttribute
+from sqlalchemy.orm.relationships import RelationshipProperty
+
+
+def _m2m_prop(rel_attr: QueryableAttribute) -> tuple[RelationshipProperty, Table]:  # type: ignore[type-arg]
+    """Return the validated M2M RelationshipProperty and its secondary table.
+
+    Raises TypeError if *rel_attr* is not a Many-to-Many relationship.
+    """
+    prop = rel_attr.property
+    if not isinstance(prop, RelationshipProperty) or prop.secondary is None:
+        raise TypeError(
+            f"m2m helpers require a Many-to-Many relationship attribute, "
+            f"got {rel_attr!r}. Use a relationship with a secondary table."
+        )
+    return prop, cast(Table, prop.secondary)
+
+
+def _parent_where(
+    prop: RelationshipProperty,  # type: ignore[type-arg]
+    instance: DeclarativeBase,
+) -> list[ColumnElement[bool]]:
+    """Build the WHERE clauses matching the owner side of *instance*."""
+    return [
+        assoc_col == getattr(instance, cast(str, parent_col.key))
+        for parent_col, assoc_col in prop.synchronize_pairs
+    ]
+
+
+async def m2m_add(
+    session: AsyncSession,
+    instance: DeclarativeBase,
+    rel_attr: QueryableAttribute,
+    *related: DeclarativeBase,
+    ignore_conflicts: bool = False,
+) -> None:
+    """Insert rows into a Many-to-Many association table without loading the ORM collection.
+
+    Args:
+        session: DB async session.
+        instance: The "owner" side model instance (e.g. the ``A`` in ``A.b_list``).
+        rel_attr: The M2M relationship attribute on the model class (e.g. ``A.b_list``).
+        *related: One or more related instances to associate with ``instance``.
+        ignore_conflicts: When ``True``, silently skip rows that already exist
+            in the association table (``ON CONFLICT DO NOTHING``).
+
+    Raises:
+        TypeError: If ``rel_attr`` is not a Many-to-Many relationship.
+
+    Example:
+        ```python
+        from fastapi_toolsets.db import m2m_add, transaction
+
+        async with transaction(session):
+            await m2m_add(session, post, Post.tags, tag1, tag2)
+        ```
+    """
+    prop, secondary = _m2m_prop(rel_attr)
+    if not related:
+        return
+
+    sync_pairs = prop.secondary_synchronize_pairs
+    assert sync_pairs is not None  # set whenever secondary is set
+
+    # synchronize_pairs:           [(parent_col, assoc_col), ...]
+    # secondary_synchronize_pairs: [(related_col, assoc_col), ...]
+    rows: list[dict[str, Any]] = []
+    for rel_instance in related:
+        row: dict[str, Any] = {}
+        for parent_col, assoc_col in prop.synchronize_pairs:
+            row[assoc_col.name] = getattr(instance, cast(str, parent_col.key))
+        for related_col, assoc_col in sync_pairs:
+            row[assoc_col.name] = getattr(rel_instance, cast(str, related_col.key))
+        rows.append(row)
+
+    stmt = pg_insert(secondary).values(rows)
+    if ignore_conflicts:
+        stmt = stmt.on_conflict_do_nothing()
+    await session.execute(stmt)
+
+
+async def m2m_remove(
+    session: AsyncSession,
+    instance: DeclarativeBase,
+    rel_attr: QueryableAttribute,
+    *related: DeclarativeBase,
+) -> None:
+    """Remove rows from a Many-to-Many association table without loading the ORM collection.
+
+    Args:
+        session: DB async session.
+        instance: The "owner" side model instance (e.g. the ``A`` in ``A.b_list``).
+        rel_attr: The M2M relationship attribute on the model class (e.g. ``A.b_list``).
+        *related: One or more related instances to disassociate from ``instance``.
+
+    Raises:
+        TypeError: If ``rel_attr`` is not a Many-to-Many relationship.
+
+    Example:
+        ```python
+        from fastapi_toolsets.db import m2m_remove, transaction
+
+        async with transaction(session):
+            await m2m_remove(session, post, Post.tags, tag1)
+        ```
+    """
+    prop, secondary = _m2m_prop(rel_attr)
+    if not related:
+        return
+
+    related_pairs = prop.secondary_synchronize_pairs
+    assert related_pairs is not None  # set whenever secondary is set
+
+    parent_where = _parent_where(prop, instance)
+
+    if len(related_pairs) == 1:
+        related_col, assoc_col = related_pairs[0]
+        related_values = [getattr(r, cast(str, related_col.key)) for r in related]
+        related_where = assoc_col.in_(related_values)
+    else:
+        assoc_cols = [ac for _, ac in related_pairs]
+        rel_cols = [rc for rc, _ in related_pairs]
+        related_values_t = [
+            tuple(getattr(r, cast(str, rc.key)) for rc in rel_cols) for r in related
+        ]
+        related_where = tuple_(*assoc_cols).in_(related_values_t)
+
+    await session.execute(delete(secondary).where(*parent_where, related_where))
+
+
+async def m2m_set(
+    session: AsyncSession,
+    instance: DeclarativeBase,
+    rel_attr: QueryableAttribute,
+    *related: DeclarativeBase,
+) -> None:
+    """Replace the entire Many-to-Many association set atomically.
+
+    Args:
+        session: DB async session.
+        instance: The "owner" side model instance (e.g. the ``A`` in ``A.b_list``).
+        rel_attr: The M2M relationship attribute on the model class (e.g. ``A.b_list``).
+        *related: The new complete set of related instances.
+
+    Raises:
+        TypeError: If ``rel_attr`` is not a Many-to-Many relationship.
+
+    Example:
+        ```python
+        from fastapi_toolsets.db import m2m_set, transaction
+
+        async with transaction(session):
+            await m2m_set(session, post, Post.tags, tag1, tag2)  # replaces all
+        ```
+    """
+    prop, secondary = _m2m_prop(rel_attr)
+
+    await session.execute(delete(secondary).where(*_parent_where(prop, instance)))
+
+    if related:
+        await m2m_add(session, instance, rel_attr, *related)

src/fastapi_toolsets/db/testing.py

@@ -0,0 +1,69 @@
+"""Database admin and test helpers: DDL and truncation."""
+
+from sqlalchemy import text
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy.orm import DeclarativeBase
+
+
+async def create_database(
+    db_name: str,
+    *,
+    server_url: str,
+) -> None:
+    """Create a database.
+
+    Connects to *server_url* using ``AUTOCOMMIT`` isolation and issues a
+    ``CREATE DATABASE`` statement for *db_name*.
+
+    Args:
+        db_name: Name of the database to create.
+        server_url: URL used for server-level DDL (must point to an existing
+            database on the same server).
+
+    Example:
+        ```python
+        from fastapi_toolsets.db.testing import create_database
+
+        SERVER_URL = "postgresql+asyncpg://postgres:postgres@localhost/postgres"
+        await create_database("myapp_test", server_url=SERVER_URL)
+        ```
+    """
+    engine = create_async_engine(server_url, isolation_level="AUTOCOMMIT")
+    try:
+        async with engine.connect() as conn:
+            await conn.execute(text(f"CREATE DATABASE {db_name}"))
+    finally:
+        await engine.dispose()
+
+
+async def cleanup_tables(
+    session: AsyncSession,
+    base: type[DeclarativeBase],
+) -> None:
+    """Truncate all tables for fast between-test cleanup.
+
+    Executes a single ``TRUNCATE … RESTART IDENTITY CASCADE`` statement
+    across every table in *base*'s metadata.
+
+    This is a no-op when the metadata contains no tables.
+
+    Args:
+        session: An active async database session.
+        base: SQLAlchemy DeclarativeBase class containing model metadata.
+
+    Example:
+        ```python
+        @pytest.fixture
+        async def db_session(worker_db_url):
+            async with create_db_session(worker_db_url, Base) as session:
+                yield session
+                await cleanup_tables(session, Base)
+        ```
+    """
+    tables = base.metadata.sorted_tables
+    if not tables:
+        return
+
+    table_names = ", ".join(f'"{t.name}"' for t in tables)
+    await session.execute(text(f"TRUNCATE {table_names} RESTART IDENTITY CASCADE"))
+    await session.commit()

src/fastapi_toolsets/db/watch.py

@@ -0,0 +1,106 @@
+"""Row-watching helpers: poll a database row until it changes."""
+
+import asyncio
+from typing import Any, TypeVar
+
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import DeclarativeBase
+
+from ..exceptions import NotFoundError
+
+_M = TypeVar("_M", bound=DeclarativeBase)
+
+
+async def wait_for_row_change(
+    session: AsyncSession,
+    model: type[_M],
+    pk_value: Any,
+    *,
+    columns: list[str] | None = None,
+    interval: float = 0.5,
+    timeout: float | None = None,
+) -> _M:
+    """Poll a database row until a change is detected.
+
+    Queries the row every ``interval`` seconds and returns the model instance
+    once a change is detected in any column (or only the specified ``columns``).
+
+    Args:
+        session: AsyncSession instance.
+        model: SQLAlchemy model class.
+        pk_value: Primary key value of the row to watch.
+        columns: Optional list of column names to watch. If None, all columns
+            are watched.
+        interval: Polling interval in seconds (default: 0.5).
+        timeout: Maximum time to wait in seconds. None means wait forever.
+
+    Returns:
+        The refreshed model instance with updated values.
+
+    Raises:
+        NotFoundError: If the row does not exist or is deleted during polling.
+        TimeoutError: If timeout expires before a change is detected.
+
+    Example:
+        ```python
+        from fastapi_toolsets.db import wait_for_row_change
+
+        # Wait for any column to change
+        updated = await wait_for_row_change(session, User, user_id)
+
+        # Watch specific columns with a timeout
+        updated = await wait_for_row_change(
+            session, User, user_id,
+            columns=["status", "email"],
+            interval=1.0,
+            timeout=30.0,
+        )
+        ```
+    """
+    bind = getattr(session, "bind", None)
+    if bind is None:
+        raise TypeError(
+            "wait_for_row_change requires a session bound to an engine "
+            "(session.bind is None)"
+        )
+    watcher = AsyncSession(bind=bind)
+    try:
+
+        async def _reload() -> _M | None:
+            await watcher.rollback()
+            return await watcher.get(model, pk_value, populate_existing=True)
+
+        instance = await _reload()
+        if instance is None:
+            raise NotFoundError(f"{model.__name__} with pk={pk_value!r} not found")
+
+        if columns is not None:
+            watch_cols = columns
+        else:
+            watch_cols = [attr.key for attr in model.__mapper__.column_attrs]
+
+        initial = {col: getattr(instance, col) for col in watch_cols}
+
+        elapsed = 0.0
+        while True:
+            await asyncio.sleep(interval)
+            elapsed += interval
+
+            if timeout is not None and elapsed >= timeout:
+                raise TimeoutError(
+                    f"No change detected on {model.__name__} "
+                    f"with pk={pk_value!r} within {timeout}s"
+                )
+
+            instance = await _reload()
+
+            if instance is None:
+                raise NotFoundError(
+                    f"{model.__name__} with pk={pk_value!r} was deleted"
+                )
+
+            current = {col: getattr(instance, col) for col in watch_cols}
+            if current != initial:
+                return instance
+    finally:
+        await watcher.close()

src/fastapi_toolsets/dependencies.py

@@ -60,7 +60,7 @@ def PathDependency(
     name = (
         param_name
         if param_name is not None
-        else "{}_{}".format(model.__name__.lower(), field.key)
+        else f"{model.__name__.lower()}_{field.key}"
     )
     python_type = field.type.python_type
 
@@ -70,22 +70,18 @@ def PathDependency(
         value = kwargs[name]
         return await crud.get(session, filters=[field == value])
 
-    setattr(
-        dependency,
-        "__signature__",
-        inspect.Signature(
-            parameters=[
-                inspect.Parameter(
-                    name, inspect.Parameter.KEYWORD_ONLY, annotation=python_type
-                ),
-                inspect.Parameter(
-                    "session",
-                    inspect.Parameter.KEYWORD_ONLY,
-                    annotation=AsyncSession,
-                    default=Depends(session_callable),
-                ),
-            ]
-        ),
+    dependency.__signature__ = inspect.Signature(  # ty:ignore[unresolved-attribute]
+        parameters=[
+            inspect.Parameter(
+                name, inspect.Parameter.KEYWORD_ONLY, annotation=python_type
+            ),
+            inspect.Parameter(
+                "session",
+                inspect.Parameter.KEYWORD_ONLY,
+                annotation=AsyncSession,
+                default=Depends(session_callable),
+            ),
+        ]
     )
 
     return cast(ModelType, Depends(cast(Callable[..., ModelType], dependency)))
@@ -134,22 +130,18 @@ def BodyDependency(
         value = kwargs[body_field]
         return await crud.get(session, filters=[field == value])
 
-    setattr(
-        dependency,
-        "__signature__",
-        inspect.Signature(
-            parameters=[
-                inspect.Parameter(
-                    body_field, inspect.Parameter.KEYWORD_ONLY, annotation=python_type
-                ),
-                inspect.Parameter(
-                    "session",
-                    inspect.Parameter.KEYWORD_ONLY,
-                    annotation=AsyncSession,
-                    default=Depends(session_callable),
-                ),
-            ]
-        ),
+    dependency.__signature__ = inspect.Signature(  # ty:ignore[unresolved-attribute]
+        parameters=[
+            inspect.Parameter(
+                body_field, inspect.Parameter.KEYWORD_ONLY, annotation=python_type
+            ),
+            inspect.Parameter(
+                "session",
+                inspect.Parameter.KEYWORD_ONLY,
+                annotation=AsyncSession,
+                default=Depends(session_callable),
+            ),
+        ]
     )
 
     return cast(ModelType, Depends(cast(Callable[..., ModelType], dependency)))

src/fastapi_toolsets/exceptions/__init__.py

@@ -7,9 +7,13 @@ from .exceptions import (
     ForbiddenError,
     InvalidFacetFilterError,
     InvalidOrderFieldError,
+    InvalidSearchColumnError,
+    LockTimeoutError,
     NoSearchableFieldsError,
     NotFoundError,
+    PoolExhaustedError,
     UnauthorizedError,
+    UnsupportedFacetTypeError,
     generate_error_responses,
 )
 from .handler import init_exceptions_handlers
@@ -19,11 +23,15 @@ __all__ = [
     "ApiException",
     "ConflictError",
     "ForbiddenError",
-    "generate_error_responses",
-    "init_exceptions_handlers",
     "InvalidFacetFilterError",
     "InvalidOrderFieldError",
+    "InvalidSearchColumnError",
+    "LockTimeoutError",
     "NoSearchableFieldsError",
     "NotFoundError",
+    "PoolExhaustedError",
     "UnauthorizedError",
+    "UnsupportedFacetTypeError",
+    "generate_error_responses",
+    "init_exceptions_handlers",
 ]

src/fastapi_toolsets/exceptions/exceptions.py

@@ -144,6 +144,61 @@ class InvalidFacetFilterError(ApiException):
         )
 
 
+class UnsupportedFacetTypeError(ApiException):
+    """Raised when a facet field has a column type not supported by filter_by."""
+
+    api_error = ApiError(
+        code=400,
+        msg="Unsupported Facet Type",
+        desc="The column type is not supported for facet filtering.",
+        err_code="FACET-TYPE-400",
+    )
+
+    def __init__(self, key: str, col_type: str) -> None:
+        """Initialize the exception.
+
+        Args:
+            key: The facet field key.
+            col_type: The unsupported column type name.
+        """
+        self.key = key
+        self.col_type = col_type
+        super().__init__(
+            desc=(
+                f"Facet field '{key}' has unsupported column type '{col_type}'. "
+                f"Supported types: String, Integer, Numeric, Boolean, "
+                f"Date, DateTime, Time, Enum, Uuid, ARRAY."
+            )
+        )
+
+
+class InvalidSearchColumnError(ApiException):
+    """Raised when search_column is not one of the configured searchable fields."""
+
+    api_error = ApiError(
+        code=400,
+        msg="Invalid Search Column",
+        desc="The requested search column is not a configured searchable field.",
+        err_code="SEARCH-COL-400",
+    )
+
+    def __init__(self, column: str, valid_columns: list[str]) -> None:
+        """Initialize the exception.
+
+        Args:
+            column: The unknown search column provided by the caller.
+            valid_columns: List of valid search column keys.
+        """
+        self.column = column
+        self.valid_columns = valid_columns
+        super().__init__(
+            desc=(
+                f"'{column}' is not a searchable column. "
+                f"Valid columns: {valid_columns}."
+            )
+        )
+
+
 class InvalidOrderFieldError(ApiException):
     """Raised when order_by contains a field not in the allowed order fields."""
 
@@ -168,6 +223,35 @@ class InvalidOrderFieldError(ApiException):
         )
 
 
+class PoolExhaustedError(ApiException):
+    """HTTP 503 - Database connection pool is exhausted."""
+
+    api_error = ApiError(
+        code=503,
+        msg="Service Unavailable",
+        desc=(
+            "The database connection pool is exhausted. "
+            "Too many concurrent requests are holding connections. "
+            "Retry shortly or contact support if the issue persists."
+        ),
+        err_code="DB-503-POOL",
+    )
+
+
+class LockTimeoutError(ApiException):
+    """HTTP 503 - A database lock could not be acquired within the timeout."""
+
+    api_error = ApiError(
+        code=503,
+        msg="Service Unavailable",
+        desc=(
+            "A database lock could not be acquired within the allowed timeout. "
+            "The resource is under heavy contention. Retry shortly."
+        ),
+        err_code="DB-503-LOCK",
+    )
+
+
 def generate_error_responses(
     *errors: type[ApiException],
 ) -> dict[int | str, dict[str, Any]]:

src/fastapi_toolsets/exceptions/handler.py

@@ -30,7 +30,7 @@ def init_exceptions_handlers(app: FastAPI) -> FastAPI:
     """
     _register_exception_handlers(app)
     _original_openapi = app.openapi
-    app.openapi = lambda: _patched_openapi(app, _original_openapi)  # type: ignore[method-assign]
+    app.openapi = lambda: _patched_openapi(app, _original_openapi)  # type: ignore[method-assign]  # ty:ignore[invalid-assignment]
     return app
 
 
@@ -122,7 +122,7 @@ def _format_validation_error(
     )
 
     return JSONResponse(
-        status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+        status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
         content=error_response.model_dump(),
     )
 
@@ -146,35 +146,34 @@ def _patched_openapi(
 
     for path_data in openapi_schema.get("paths", {}).values():
         for operation in path_data.values():
-            if isinstance(operation, dict) and "responses" in operation:
-                if "422" in operation["responses"]:
-                    operation["responses"]["422"] = {
-                        "description": "Validation Error",
-                        "content": {
-                            "application/json": {
-                                "examples": {
-                                    "VAL-422": {
-                                        "summary": "Validation Error",
-                                        "value": {
-                                            "data": {
-                                                "errors": [
-                                                    {
-                                                        "field": "field_name",
-                                                        "message": "value is not valid",
-                                                        "type": "value_error",
-                                                    }
-                                                ]
-                                            },
-                                            "status": ResponseStatus.FAIL.value,
-                                            "message": "Validation Error",
-                                            "description": "1 validation error(s) detected",
-                                            "error_code": "VAL-422",
+            if isinstance(operation, dict) and "422" in operation.get("responses", {}):
+                operation["responses"]["422"] = {
+                    "description": "Validation Error",
+                    "content": {
+                        "application/json": {
+                            "examples": {
+                                "VAL-422": {
+                                    "summary": "Validation Error",
+                                    "value": {
+                                        "data": {
+                                            "errors": [
+                                                {
+                                                    "field": "field_name",
+                                                    "message": "value is not valid",
+                                                    "type": "value_error",
+                                                }
+                                            ]
                                         },
-                                    }
+                                        "status": ResponseStatus.FAIL.value,
+                                        "message": "Validation Error",
+                                        "description": "1 validation error(s) detected",
+                                        "error_code": "VAL-422",
+                                    },
                                 }
                             }
-                        },
-                    }
+                        }
+                    },
+                }
 
     app.openapi_schema = openapi_schema
     return app.openapi_schema

src/fastapi_toolsets/fixtures/__init__.py

@@ -1,15 +1,34 @@
 """Fixture system for seeding databases with dependency resolution."""
 
-from .enum import LoadStrategy
-from .registry import Context, FixtureRegistry
-from .utils import get_obj_by_attr, load_fixtures, load_fixtures_by_context
+from typing import TYPE_CHECKING
+
+from .enum import Context, LoadStrategy
+
+if TYPE_CHECKING:
+    from .registry import FixtureRegistry
+    from .utils import load_fixtures, load_fixtures_by_context
 
 __all__ = [
     "Context",
     "FixtureRegistry",
     "LoadStrategy",
-    "get_obj_by_attr",
     "load_fixtures",
     "load_fixtures_by_context",
-    "register_fixtures",
 ]
+
+_LAZY = {
+    "FixtureRegistry": ".registry",
+    "load_fixtures": ".utils",
+    "load_fixtures_by_context": ".utils",
+}
+
+
+def __getattr__(name: str):
+    module_name = _LAZY.get(name)
+    if module_name is None:
+        raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
+
+    import importlib
+
+    module = importlib.import_module(module_name, __name__)
+    return getattr(module, name)

src/fastapi_toolsets/fixtures/registry.py

@@ -2,14 +2,24 @@
 
 from collections.abc import Callable, Sequence
 from dataclasses import dataclass, field
+from enum import Enum
 from typing import Any, cast
 
 from sqlalchemy.orm import DeclarativeBase
 
-from ..logger import get_logger
 from .enum import Context
 
-logger = get_logger()
+
+def _normalize_contexts(
+    contexts: list[str | Enum] | tuple[str | Enum, ...],
+) -> list[str]:
+    """Convert a sequence of any Enum subclass and/or plain strings to a list of strings."""
+    return [c.value if isinstance(c, Enum) else c for c in contexts]
+
+
+def _context_filter_values(contexts: tuple[str | Enum, ...]) -> set[str]:
+    """Normalize *contexts* for filtering, always including Context.BASE."""
+    return set(_normalize_contexts(contexts)) | {Context.BASE.value}
 
 
 @dataclass
@@ -50,26 +60,49 @@ class FixtureRegistry:
                 Post(id=1, title="Test", user_id=1),
             ]
         ```
+
+    Fixtures with the same name may be registered for **different** contexts.
+    When multiple contexts are loaded together, their instances are merged:
+
+        ```python
+        @fixtures.register(contexts=[Context.BASE])
+        def users():
+            return [User(id=1, username="admin")]
+
+        @fixtures.register(contexts=[Context.TESTING])
+        def users():
+            return [User(id=2, username="tester")]
+        ```
     """
 
     def __init__(
         self,
-        contexts: list[str | Context] | None = None,
+        contexts: list[str | Enum] | None = None,
     ) -> None:
-        self._fixtures: dict[str, Fixture] = {}
+        self._fixtures: dict[str, list[Fixture]] = {}
         self._default_contexts: list[str] | None = (
-            [c.value if isinstance(c, Context) else c for c in contexts]
-            if contexts
-            else None
+            _normalize_contexts(contexts) if contexts else None
         )
 
+    def _validate_no_context_overlap(self, name: str, new_contexts: list[str]) -> None:
+        """Raise ``ValueError`` if any existing variant for *name* overlaps."""
+        existing_variants = self._fixtures.get(name, [])
+        new_set = set(new_contexts)
+        for variant in existing_variants:
+            if set(variant.contexts) & new_set:
+                raise ValueError(
+                    f"Fixture '{name}' already exists in the current registry "
+                    f"with overlapping contexts. Use distinct context sets for "
+                    f"each variant of the same fixture name."
+                )
+
     def register(
         self,
         func: Callable[[], Sequence[DeclarativeBase]] | None = None,
         *,
         name: str | None = None,
         depends_on: list[str] | None = None,
-        contexts: list[str | Context] | None = None,
+        contexts: list[str | Enum] | None = None,
     ) -> Callable[..., Any]:
         """Register a fixture function.
 
@@ -79,7 +112,8 @@ class FixtureRegistry:
             func: Fixture function returning list of model instances
             name: Fixture name (defaults to function name)
             depends_on: List of fixture names this depends on
-            contexts: List of contexts this fixture belongs to
+            contexts: List of contexts this fixture belongs to.  Both
+                :class:`Context` enum values and plain strings are accepted.
 
         Example:
             ```python
@@ -90,7 +124,6 @@ class FixtureRegistry:
             @fixtures.register(depends_on=["roles"], contexts=[Context.TESTING])
             def test_users():
                 return [User(id=1, username="test", role_id=1)]
-            ```
         """
 
         def decorator(
@@ -98,19 +131,20 @@ class FixtureRegistry:
         ) -> Callable[[], Sequence[DeclarativeBase]]:
             fixture_name = name or cast(Any, fn).__name__
             if contexts is not None:
-                fixture_contexts = [
-                    c.value if isinstance(c, Context) else c for c in contexts
-                ]
+                fixture_contexts = _normalize_contexts(contexts)
             elif self._default_contexts is not None:
                 fixture_contexts = self._default_contexts
             else:
                 fixture_contexts = [Context.BASE.value]
 
-            self._fixtures[fixture_name] = Fixture(
-                name=fixture_name,
-                func=fn,
-                depends_on=depends_on or [],
-                contexts=fixture_contexts,
+            self._validate_no_context_overlap(fixture_name, fixture_contexts)
+            self._fixtures.setdefault(fixture_name, []).append(
+                Fixture(
+                    name=fixture_name,
+                    func=fn,
+                    depends_on=depends_on or [],
+                    contexts=fixture_contexts,
+                )
             )
             return fn
 
@@ -121,11 +155,14 @@ class FixtureRegistry:
     def include_registry(self, registry: "FixtureRegistry") -> None:
         """Include another `FixtureRegistry` in the same current `FixtureRegistry`.
 
+        Fixtures with the same name are allowed as long as their context sets
+        do not overlap.  Conflicting contexts raise :class:`ValueError`.
+
         Args:
             registry: The `FixtureRegistry` to include
 
         Raises:
-            ValueError: If a fixture name already exists in the current registry
+            ValueError: If a fixture name already exists with overlapping contexts
 
         Example:
             ```python
@@ -139,31 +176,145 @@ class FixtureRegistry:
             registry.include_registry(registry=dev_registry)
             ```
         """
-        for name, fixture in registry._fixtures.items():
-            if name in self._fixtures:
-                raise ValueError(
-                    f"Fixture '{name}' already exists in the current registry"
-                )
-            self._fixtures[name] = fixture
+        for name, variants in registry._fixtures.items():
+            for fixture in variants:
+                self._validate_no_context_overlap(name, fixture.contexts)
+                self._fixtures.setdefault(name, []).append(fixture)
 
     def get(self, name: str) -> Fixture:
-        """Get a fixture by name."""
+        """Get a fixture by name.
+
+        Raises:
+            KeyError: If no fixture with *name* is registered.
+            ValueError: If the fixture has multiple context variants — use
+                :meth:`get_variants` in that case.
+        """
+        variants = self.get_variants(name)
+        if len(variants) > 1:
+            raise ValueError(
+                f"Fixture '{name}' has {len(variants)} context variants. "
+                f"Use get_variants('{name}') to retrieve them."
+            )
+        return variants[0]
+
+    def get_variants(self, name: str, *contexts: str | Enum) -> list[Fixture]:
+        """Return all registered variants for *name*, optionally filtered by context.
+
+        Args:
+            name: Fixture name.
+            *contexts: If given, only return variants whose context set
+                intersects with these values (:class:`Context.BASE` variants
+                are always included).  Both :class:`Context` enum values and
+                plain strings are accepted.
+
+        Returns:
+            List of matching :class:`Fixture` objects (may be empty when a
+            context filter is applied and nothing matches).
+
+        Raises:
+            KeyError: If no fixture with *name* is registered.
+        """
         if name not in self._fixtures:
             raise KeyError(f"Fixture '{name}' not found")
-        return self._fixtures[name]
+        variants = self._fixtures[name]
+        if not contexts:
+            return list(variants)
+        context_values = _context_filter_values(contexts)
+        return [v for v in variants if set(v.contexts) & context_values]
+
+    def get_load_variants(self, name: str, *contexts: str | Enum) -> list[Fixture]:
+        """Return variants for *name* filtered by *contexts*.
+
+        Raises:
+            KeyError: If no fixture with *name* is registered.
+        """
+        variants = self.get_variants(name, *contexts)
+        if contexts and not variants:
+            return self.get_variants(name)
+        return variants
 
     def get_all(self) -> list[Fixture]:
-        """Get all registered fixtures."""
-        return list(self._fixtures.values())
+        """Get all registered fixtures (all variants of all names)."""
+        return [f for variants in self._fixtures.values() for f in variants]
 
-    def get_by_context(self, *contexts: str | Context) -> list[Fixture]:
+    def get_dependencies(self, name: str) -> list[str]:
+        """Get the union of ``depends_on`` across all variants of *name*.
+
+        Raises:
+            KeyError: If no fixture named *name* is registered.
+        """
+        variants = self._fixtures.get(name)
+        if variants is None:
+            raise KeyError(f"Fixture '{name}' not found")
+
+        seen: set[str] = set()
+        deps: list[str] = []
+        for variant in variants:
+            for dep in variant.depends_on:
+                if dep not in seen:
+                    deps.append(dep)
+                    seen.add(dep)
+        return deps
+
+    def obj(self, name: str, attr_name: str, value: Any) -> DeclarativeBase:
+        """Get a model instance from a registered fixture by attribute value.
+
+        Args:
+            name: Fixture name to look up.
+            attr_name: Name of the attribute to match against.
+            value: Value to match.
+
+        Returns:
+            The first model instance where the attribute matches the given value.
+
+        Raises:
+            KeyError: If no fixture named *name* is registered.
+            StopIteration: If no matching object is found.
+        """
+        instances = (
+            obj for variant in self.get_variants(name) for obj in variant.func()
+        )
+        try:
+            return next(obj for obj in instances if getattr(obj, attr_name) == value)
+        except StopIteration:
+            raise StopIteration(
+                f"No object with {attr_name}={value} found in fixture '{name}'"
+            ) from None
+
+    def field(self, name: str, attr_name: str, value: Any, *, field: str = "id") -> Any:
+        """Get a single field value from a fixture object matched by an attribute.
+
+        Args:
+            name: Fixture name to look up.
+            attr_name: Name of the attribute to match against.
+            value: Value to match.
+            field: Attribute name to return from the matched object (default: ``"id"``).
+
+        Returns:
+            The value of ``field`` on the first matching model instance.
+
+        Raises:
+            KeyError: If no fixture named *name* is registered.
+            StopIteration: If no matching object is found.
+        """
+        return getattr(self.obj(name, attr_name, value), field)
+
+    def get_by_context(self, *contexts: str | Enum) -> list[Fixture]:
         """Get fixtures for specific contexts."""
-        context_values = {c.value if isinstance(c, Context) else c for c in contexts}
-        return [f for f in self._fixtures.values() if set(f.contexts) & context_values]
+        context_values = _context_filter_values(contexts)
+        return [
+            f
+            for variants in self._fixtures.values()
+            for f in variants
+            if set(f.contexts) & context_values
+        ]
 
     def resolve_dependencies(self, *names: str) -> list[str]:
         """Resolve fixture dependencies in topological order.
 
+        When a fixture name has multiple context variants, the union of all
+        variants' ``depends_on`` lists is used.
+
         Args:
             *names: Fixture names to resolve
 
@@ -175,7 +326,6 @@ class FixtureRegistry:
             ValueError: If circular dependency detected
         """
         resolved: list[str] = []
-        seen: set[str] = set()
         visiting: set[str] = set()
 
         def visit(name: str) -> None:
@@ -185,21 +335,18 @@ class FixtureRegistry:
                 raise ValueError(f"Circular dependency detected: {name}")
 
             visiting.add(name)
-            fixture = self.get(name)
-
-            for dep in fixture.depends_on:
+            for dep in self.get_dependencies(name):
                 visit(dep)
 
             visiting.remove(name)
             resolved.append(name)
-            seen.add(name)
 
         for name in names:
             visit(name)
 
         return resolved
 
-    def resolve_context_dependencies(self, *contexts: str | Context) -> list[str]:
+    def resolve_context_dependencies(self, *contexts: str | Enum) -> list[str]:
         """Resolve all fixtures for contexts with dependencies.
 
         Args:
@@ -209,11 +356,8 @@ class FixtureRegistry:
             List of fixture names in load order
         """
         context_fixtures = self.get_by_context(*contexts)
-        names = [f.name for f in context_fixtures]
+        # Deduplicate names while preserving first-seen order (a name can
+        # appear multiple times if it has variants in different contexts).
+        names = list(dict.fromkeys(f.name for f in context_fixtures))
 
-        all_deps: set[str] = set()
-        for name in names:
-            deps = self.resolve_dependencies(name)
-            all_deps.update(deps)
-
-        return self.resolve_dependencies(*all_deps)
+        return self.resolve_dependencies(*names)

src/fastapi_toolsets/fixtures/utils.py

@@ -1,32 +1,311 @@
 """Fixture loading utilities for database seeding."""
 
-from collections.abc import Callable, Sequence
-from typing import Any
+from collections.abc import Iterator
+from enum import Enum
+from typing import Any, cast
 
+from sqlalchemy import Table, select
+from sqlalchemy import inspect as sa_inspect
+from sqlalchemy.dialects.postgresql import insert as pg_insert
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.orm import DeclarativeBase, selectinload
+from sqlalchemy.orm.interfaces import ExecutableOption, ORMOption
 
-from ..db import get_transaction
+from ..db import transaction
 from ..logger import get_logger
-from ..types import ModelType
 from .enum import LoadStrategy
-from .registry import Context, FixtureRegistry
+from .registry import FixtureRegistry, _normalize_contexts
 
 logger = get_logger()
 
 
+def _instance_to_dict(instance: DeclarativeBase) -> dict[str, Any]:
+    """Extract column values from a model instance, skipping unset server-default columns."""
+    state = sa_inspect(instance)
+    state_dict = state.dict
+    result: dict[str, Any] = {}
+    for prop in state.mapper.column_attrs:
+        if prop.key not in state_dict:
+            continue
+        val = state_dict[prop.key]
+        if val is None:
+            col = prop.columns[0]
+
+            if (
+                col.server_default is not None
+                or (col.default is not None and col.default.is_callable)
+                or col.autoincrement is True
+            ):
+                continue
+        result[prop.key] = val
+    return result
+
+
+def _get_table_chain(model_cls: type[DeclarativeBase]) -> list[type[DeclarativeBase]]:
+    """Return [root, ..., model_cls] for joined-table inheritance, or [model_cls]."""
+    chain: list[type[DeclarativeBase]] = []
+    current = sa_inspect(model_cls)
+    while current is not None:
+        chain.append(current.class_)
+        current = current.inherits
+    chain.reverse()
+    seen: set[int] = set()
+    result: list[type[DeclarativeBase]] = []
+    for cls in chain:
+        tid = id(cls.__table__)
+        if tid not in seen:  # pragma: no branch
+            seen.add(tid)
+            result.append(cls)
+    return result
+
+
+def _instance_to_dict_for_cls(
+    instance: DeclarativeBase, cls: type[DeclarativeBase]
+) -> dict[str, Any]:
+    """Like _instance_to_dict but limited to columns belonging to cls's own table."""
+    own_cols = {col.key for col in cls.__table__.columns}
+    return {k: v for k, v in _instance_to_dict(instance).items() if k in own_cols}
+
+
+def _group_by_type(
+    instances: list[DeclarativeBase],
+) -> list[tuple[type[DeclarativeBase], list[DeclarativeBase]]]:
+    """Group instances by their concrete model class, preserving insertion order."""
+    groups: dict[type[DeclarativeBase], list[DeclarativeBase]] = {}
+    for instance in instances:
+        groups.setdefault(type(instance), []).append(instance)
+    return list(groups.items())
+
+
+def _group_by_column_set(
+    dicts: list[dict[str, Any]],
+    instances: list[DeclarativeBase],
+) -> list[tuple[list[dict[str, Any]], list[DeclarativeBase]]]:
+    """Group (dict, instance) pairs by their dict key sets."""
+    groups: dict[
+        frozenset[str], tuple[list[dict[str, Any]], list[DeclarativeBase]]
+    ] = {}
+    for d, inst in zip(dicts, instances):
+        key = frozenset(d)
+        if key not in groups:
+            groups[key] = ([], [])
+        groups[key][0].append(d)
+        groups[key][1].append(inst)
+    return list(groups.values())
+
+
+def _grouped_table_dicts(
+    model_cls: type[DeclarativeBase], instances: list[DeclarativeBase]
+) -> Iterator[
+    tuple[type[DeclarativeBase], list[dict[str, Any]], list[DeclarativeBase]]
+]:
+    """Yield (cls, group_dicts, group_instances) per table in the inheritance
+    chain and per column-set group, skipping empty groups.
+    """
+    for cls in _get_table_chain(model_cls):
+        dicts = [_instance_to_dict_for_cls(i, cls) for i in instances]
+        for group_dicts, group_instances in _group_by_column_set(dicts, instances):
+            if group_dicts and group_dicts[0]:  # pragma: no branch
+                yield cls, group_dicts, group_instances
+
+
+async def _batch_insert(
+    session: AsyncSession,
+    model_cls: type[DeclarativeBase],
+    instances: list[DeclarativeBase],
+) -> None:
+    """INSERT all instances, raises on conflict."""
+    for cls, group_dicts, group_instances in _grouped_table_dicts(model_cls, instances):
+        table = cast(Table, cls.__table__)
+        missing_pk_cols = [
+            col for col in table.primary_key.columns if col.key not in group_dicts[0]
+        ]
+        if not missing_pk_cols:
+            await session.execute(pg_insert(table), group_dicts)
+            continue
+        stmt = pg_insert(table).returning(
+            *missing_pk_cols, sort_by_parameter_order=True
+        )
+        result = await session.execute(stmt, group_dicts)
+        for inst, row in zip(group_instances, result):
+            for col, val in zip(missing_pk_cols, row):
+                setattr(inst, col.key, val)
+
+
+async def _batch_merge(
+    session: AsyncSession,
+    model_cls: type[DeclarativeBase],
+    instances: list[DeclarativeBase],
+) -> None:
+    """UPSERT: insert new rows, update existing ones with the provided values."""
+    for cls, group_dicts, _ in _grouped_table_dicts(model_cls, instances):
+        table = cast(Table, cls.__table__)
+        pk_names = [col.name for col in table.primary_key]
+        pk_names_set = set(pk_names)
+        own_col_keys = {col.key for col in table.columns}
+        non_pk_cols = [k for k in own_col_keys if k not in pk_names_set]
+
+        stmt = pg_insert(table).values(group_dicts)
+
+        inserted_keys = set(group_dicts[0])
+        update_cols = [col for col in non_pk_cols if col in inserted_keys]
+
+        if update_cols:
+            stmt = stmt.on_conflict_do_update(
+                index_elements=pk_names,
+                set_={col: stmt.excluded[col] for col in update_cols},
+            )
+        else:
+            stmt = stmt.on_conflict_do_nothing(index_elements=pk_names)
+
+        await session.execute(stmt)
+
+
+async def _batch_skip_existing(
+    session: AsyncSession,
+    model_cls: type[DeclarativeBase],
+    instances: list[DeclarativeBase],
+) -> list[DeclarativeBase]:
+    """INSERT only rows that do not already exist; return the inserted ones."""
+    if len(_get_table_chain(model_cls)) > 1:
+        loaded: list[DeclarativeBase] = []
+        for inst in instances:
+            pk = _get_primary_key(inst)
+            if pk is None or not await session.get(model_cls, pk):
+                session.add(inst)
+                loaded.append(inst)
+        await session.flush()
+        return loaded
+
+    mapper = model_cls.__mapper__
+    pk_names = [col.name for col in mapper.primary_key]
+
+    no_pk: list[DeclarativeBase] = []
+    with_pk_pairs: list[tuple[DeclarativeBase, Any]] = []
+    for inst in instances:
+        pk = _get_primary_key(inst)
+        if pk is None:
+            no_pk.append(inst)
+        else:
+            with_pk_pairs.append((inst, pk))
+
+    loaded = list(no_pk)
+    if no_pk:
+        no_pk_dicts = [_instance_to_dict(i) for i in no_pk]
+        for group_dicts, group_instances in _group_by_column_set(no_pk_dicts, no_pk):
+            stmt = pg_insert(cast(Table, model_cls.__table__)).returning(
+                *mapper.primary_key, sort_by_parameter_order=True
+            )
+            result = await session.execute(stmt, group_dicts)
+            for inst, row in zip(group_instances, result):
+                for col, val in zip(mapper.primary_key, row):
+                    setattr(inst, cast(str, col.key), val)
+
+    if with_pk_pairs:
+        with_pk = [i for i, _ in with_pk_pairs]
+        with_pk_dicts = [_instance_to_dict(i) for i in with_pk]
+        for group_dicts, group_insts in _group_by_column_set(with_pk_dicts, with_pk):
+            stmt = (
+                pg_insert(model_cls)
+                .values(group_dicts)
+                .on_conflict_do_nothing(index_elements=pk_names)
+            )
+            result = await session.execute(stmt.returning(*mapper.primary_key))
+            inserted_pks = {
+                row[0] if len(pk_names) == 1 else tuple(row) for row in result
+            }
+            loaded.extend(
+                inst
+                for inst, pk in zip(
+                    group_insts, [_get_primary_key(i) for i in group_insts]
+                )
+                if pk in inserted_pks
+            )
+
+    return loaded
+
+
+def _relationship_load_options(model: type[DeclarativeBase]) -> list[ExecutableOption]:
+    """Build selectinload options for all direct relationships on a model."""
+    return [
+        selectinload(getattr(model, rel.key)) for rel in model.__mapper__.relationships
+    ]
+
+
+async def _reload_with_relationships(
+    session: AsyncSession,
+    instances: list[DeclarativeBase],
+    load_options: list[ExecutableOption],
+) -> list[DeclarativeBase]:
+    """Reload instances in a single bulk query with relationship eager-loading."""
+    model = type(instances[0])
+    mapper = model.__mapper__
+    pk_cols = mapper.primary_key
+
+    if len(pk_cols) == 1:
+        pk_key = cast(str, pk_cols[0].key)
+        pk_attr = getattr(model, pk_key)
+        pks = [getattr(inst, pk_key) for inst in instances]
+        result = await session.execute(
+            select(model).where(pk_attr.in_(pks)).options(*load_options)
+        )
+        by_pk = {getattr(row, pk_key): row for row in result.unique().scalars()}
+        return [by_pk[pk] for pk in pks]
+
+    # Composite PK: fall back to per-instance reload
+    reloaded: list[DeclarativeBase] = []
+    for instance in instances:
+        pk = _get_primary_key(instance)
+        refreshed = await session.get(
+            model,
+            pk,
+            options=cast(list[ORMOption], load_options),
+            populate_existing=True,
+        )
+        if refreshed is not None:  # pragma: no branch
+            reloaded.append(refreshed)
+    return reloaded
+
+
+async def _refresh_loaded(
+    session: AsyncSession, instances: list[DeclarativeBase]
+) -> list[DeclarativeBase]:
+    """Re-select freshly written rows, eager-loading relationships."""
+    if not instances:
+        return []
+    refreshed: list[DeclarativeBase | None] = [None] * len(instances)
+    for model_cls, group in _group_by_type(instances):
+        positions = [i for i, inst in enumerate(instances) if type(inst) is model_cls]
+        load_options = _relationship_load_options(model_cls)
+        for pos, new in zip(
+            positions, await _reload_with_relationships(session, group, load_options)
+        ):
+            refreshed[pos] = new
+    return cast(list[DeclarativeBase], refreshed)
+
+
 async def _load_ordered(
     session: AsyncSession,
     registry: FixtureRegistry,
     ordered_names: list[str],
     strategy: LoadStrategy,
+    contexts: tuple[str, ...] | None = None,
 ) -> dict[str, list[DeclarativeBase]]:
-    """Load fixtures in order."""
+    """Load fixtures in order using batch Core INSERT statements."""
     results: dict[str, list[DeclarativeBase]] = {}
 
     for name in ordered_names:
-        fixture = registry.get(name)
-        instances = list(fixture.func())
+        variants = (
+            registry.get_load_variants(name, *contexts)
+            if contexts is not None
+            else registry.get_variants(name)
+        )
+
+        if not variants:  # pragma: no cover
+            results[name] = []
+            continue
+
+        instances = [inst for v in variants for inst in v.func()]
 
         if not instances:
             results[name] = []
@@ -35,29 +314,25 @@ async def _load_ordered(
         model_name = type(instances[0]).__name__
         loaded: list[DeclarativeBase] = []
 
-        async with get_transaction(session):
-            for instance in instances:
-                if strategy == LoadStrategy.INSERT:
-                    session.add(instance)
-                    loaded.append(instance)
+        async with transaction(session):
+            for model_cls, group in _group_by_type(instances):
+                match strategy:
+                    case LoadStrategy.INSERT:
+                        await _batch_insert(session, model_cls, group)
+                        loaded.extend(group)
+                    case LoadStrategy.MERGE:
+                        await _batch_merge(session, model_cls, group)
+                        loaded.extend(group)
+                    case LoadStrategy.SKIP_EXISTING:
+                        inserted = await _batch_skip_existing(session, model_cls, group)
+                        loaded.extend(inserted)
+                    case _:  # pragma: no cover
+                        pass
 
-                elif strategy == LoadStrategy.MERGE:
-                    merged = await session.merge(instance)
-                    loaded.append(merged)
-
-                else:  # LoadStrategy.SKIP_EXISTING
-                    pk = _get_primary_key(instance)
-                    if pk is not None:
-                        existing = await session.get(type(instance), pk)
-                        if existing is None:
-                            session.add(instance)
-                            loaded.append(instance)
-                    else:
-                        session.add(instance)
-                        loaded.append(instance)
+            loaded = await _refresh_loaded(session, loaded)
 
         results[name] = loaded
-        logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
+        logger.info("Loaded fixture '%s': %d %s(s)", name, len(loaded), model_name)
 
     return results
 
@@ -76,31 +351,6 @@ def _get_primary_key(instance: DeclarativeBase) -> Any | None:
     return None
 
 
-def get_obj_by_attr(
-    fixtures: Callable[[], Sequence[ModelType]], attr_name: str, value: Any
-) -> ModelType:
-    """Get a SQLAlchemy model instance by matching an attribute value.
-
-    Args:
-        fixtures: A fixture function registered via ``@registry.register``
-            that returns a sequence of SQLAlchemy model instances.
-        attr_name: Name of the attribute to match against.
-        value: Value to match.
-
-    Returns:
-        The first model instance where the attribute matches the given value.
-
-    Raises:
-        StopIteration: If no matching object is found in the fixture group.
-    """
-    try:
-        return next(obj for obj in fixtures() if getattr(obj, attr_name) == value)
-    except StopIteration:
-        raise StopIteration(
-            f"No object with {attr_name}={value} found in fixture '{getattr(fixtures, '__name__', repr(fixtures))}'"
-        ) from None
-
-
 async def load_fixtures(
     session: AsyncSession,
     registry: FixtureRegistry,
@@ -109,6 +359,8 @@ async def load_fixtures(
 ) -> dict[str, list[DeclarativeBase]]:
     """Load specific fixtures by name with dependencies.
 
+    All context variants of each requested fixture are loaded and merged.
+
     Args:
         session: Database session
         registry: Fixture registry
@@ -125,7 +377,7 @@ async def load_fixtures(
 async def load_fixtures_by_context(
     session: AsyncSession,
     registry: FixtureRegistry,
-    *contexts: str | Context,
+    *contexts: str | Enum,
     strategy: LoadStrategy = LoadStrategy.MERGE,
 ) -> dict[str, list[DeclarativeBase]]:
     """Load all fixtures for specific contexts.
@@ -133,11 +385,15 @@ async def load_fixtures_by_context(
     Args:
         session: Database session
         registry: Fixture registry
-        *contexts: Contexts to load (e.g., Context.BASE, Context.TESTING)
+        *contexts: Contexts to load (e.g., ``Context.TESTING``, or plain
+            strings for custom contexts)
         strategy: How to handle existing records
 
     Returns:
         Dict mapping fixture names to loaded instances
     """
+    context_strings = tuple(_normalize_contexts(contexts))
     ordered = registry.resolve_context_dependencies(*contexts)
-    return await _load_ordered(session, registry, ordered, strategy)
+    return await _load_ordered(
+        session, registry, ordered, strategy, contexts=context_strings
+    )

src/fastapi_toolsets/logger.py

@@ -66,7 +66,7 @@ def configure_logging(
 _SENTINEL = object()
 
 
-def get_logger(name: str | None = _SENTINEL) -> logging.Logger:  # type: ignore[assignment]
+def get_logger(name: str | None = _SENTINEL) -> logging.Logger:  # type: ignore[assignment]  # ty:ignore[invalid-parameter-default]
     """Return a logger with the given *name*.
 
     A thin convenience wrapper around :func:`logging.getLogger` that keeps

src/fastapi_toolsets/metrics/handler.py

@@ -1,6 +1,6 @@
 """Prometheus metrics endpoint for FastAPI applications."""
 
-import asyncio
+import inspect
 import os
 
 from fastapi import FastAPI
@@ -55,10 +55,10 @@ def init_metrics(
 
     # Partition collectors and cache env check at startup — both are stable for the app lifetime.
     async_collectors = [
-        c for c in registry.get_collectors() if asyncio.iscoroutinefunction(c.func)
+        c for c in registry.get_collectors() if inspect.iscoroutinefunction(c.func)
     ]
     sync_collectors = [
-        c for c in registry.get_collectors() if not asyncio.iscoroutinefunction(c.func)
+        c for c in registry.get_collectors() if not inspect.iscoroutinefunction(c.func)
     ]
     multiprocess_mode = _is_multiprocess()
 

src/fastapi_toolsets/models/__init__.py

@@ -3,19 +3,19 @@
 from .columns import (
     CreatedAtMixin,
     TimestampMixin,
+    UpdatedAtMixin,
     UUIDMixin,
     UUIDv7Mixin,
-    UpdatedAtMixin,
 )
-from .watched import ModelEvent, WatchedFieldsMixin, watch
+from .watched import EventSession, ModelEvent, listens_for
 
 __all__ = [
+    "CreatedAtMixin",
+    "EventSession",
     "ModelEvent",
+    "TimestampMixin",
     "UUIDMixin",
     "UUIDv7Mixin",
-    "CreatedAtMixin",
     "UpdatedAtMixin",
-    "TimestampMixin",
-    "WatchedFieldsMixin",
-    "watch",
+    "listens_for",
 ]

src/fastapi_toolsets/models/columns.py

@@ -6,14 +6,6 @@ from datetime import datetime
 from sqlalchemy import DateTime, Uuid, text
 from sqlalchemy.orm import Mapped, mapped_column
 
-__all__ = [
-    "UUIDMixin",
-    "UUIDv7Mixin",
-    "CreatedAtMixin",
-    "UpdatedAtMixin",
-    "TimestampMixin",
-]
-
 
 class UUIDMixin:
     """Mixin that adds a UUID primary key auto-generated by the database."""

src/fastapi_toolsets/models/watched.py

@@ -1,68 +1,110 @@
 """Field-change monitoring via SQLAlchemy session events."""
 
-import asyncio
-import weakref
-from collections.abc import Awaitable
+import inspect
+from collections.abc import Callable
 from enum import Enum
-from typing import Any, TypeVar
+from typing import Any
 
-from sqlalchemy import event
+from sqlalchemy import event, select, tuple_
 from sqlalchemy import inspect as sa_inspect
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm.attributes import set_committed_value as _sa_set_committed_value
 
 from ..logger import get_logger
 
-__all__ = ["ModelEvent", "WatchedFieldsMixin", "watch"]
-
 _logger = get_logger()
-_T = TypeVar("_T")
-_CALLBACK_ERROR_MSG = "WatchedFieldsMixin callback raised an unhandled exception"
-_WATCHED_FIELDS: weakref.WeakKeyDictionary[type, list[str]] = (
-    weakref.WeakKeyDictionary()
-)
-_SESSION_PENDING_NEW = "_ft_pending_new"
-_SESSION_CREATES = "_ft_creates"
-_SESSION_DELETES = "_ft_deletes"
-_SESSION_UPDATES = "_ft_updates"
 
 
 class ModelEvent(str, Enum):
-    """Event types emitted by :class:`WatchedFieldsMixin`."""
+    """Event types dispatched by :class:`EventSession`."""
 
     CREATE = "create"
     DELETE = "delete"
     UPDATE = "update"
 
 
-def watch(*fields: str) -> Any:
-    """Class decorator to filter which fields trigger ``on_update``.
+_CALLBACK_ERROR_MSG = "Event callback raised an unhandled exception"
+_SESSION_CREATES = "_ft_creates"
+_SESSION_DELETES = "_ft_deletes"
+_SESSION_UPDATES = "_ft_updates"
+_DEFERRED_STRATEGY_KEY = (("deferred", True), ("instrument", True))
+_EVENT_HANDLERS: dict[tuple[type, ModelEvent], list[Callable[..., Any]]] = {}
+_HANDLER_CACHE: dict[tuple[type, ModelEvent], list[Callable[..., Any]]] = {}
+
+
+def _invalidate_caches() -> None:
+    """Clear lookup caches after handler registration."""
+    _HANDLER_CACHE.clear()
+
+
+def listens_for(
+    model_class: type,
+    event_types: list[ModelEvent] | None = None,
+) -> Callable[[Callable[..., Any]], Callable[..., Any]]:
+    """Register a callback for one or more model lifecycle events.
 
     Args:
-        *fields: One or more field names to watch. At least one name is required.
-
-    Raises:
-        ValueError: If called with no field names.
+        model_class: The SQLAlchemy model class to listen on.
+        event_types: List of :class:`ModelEvent` values to listen for.
+            Defaults to all event types.
     """
-    if not fields:
-        raise ValueError("@watch requires at least one field name.")
+    evs = event_types if event_types is not None else list(ModelEvent)
 
-    def decorator(cls: type[_T]) -> type[_T]:
-        _WATCHED_FIELDS[cls] = list(fields)
-        return cls
+    def decorator(fn: Callable[..., Any]) -> Callable[..., Any]:
+        for ev in evs:
+            _EVENT_HANDLERS.setdefault((model_class, ev), []).append(fn)
+        _invalidate_caches()
+        return fn
 
     return decorator
 
 
+def _get_handlers(cls: type, ev: ModelEvent) -> list[Callable[..., Any]]:
+    """Return registered handlers for *cls* and *ev*, walking the MRO."""
+    key = (cls, ev)
+    try:
+        return _HANDLER_CACHE[key]
+    except KeyError:
+        handlers: list[Callable[..., Any]] = []
+        for klass in cls.__mro__:
+            handlers.extend(_EVENT_HANDLERS.get((klass, ev), []))
+        _HANDLER_CACHE[key] = handlers
+        return handlers
+
+
 def _snapshot_column_attrs(obj: Any) -> dict[str, Any]:
     """Read currently-loaded column values into a plain dict."""
     state = sa_inspect(obj)  # InstanceState
     state_dict = state.dict
-    return {
-        prop.key: state_dict[prop.key]
-        for prop in state.mapper.column_attrs
-        if prop.key in state_dict
-    }
+    snapshot: dict[str, Any] = {}
+    for prop in state.mapper.column_attrs:
+        if prop.key in state_dict:
+            snapshot[prop.key] = state_dict[prop.key]
+        elif (  # pragma: no cover
+            not state.expired
+            and prop.strategy_key != _DEFERRED_STRATEGY_KEY
+            and all(
+                col.nullable
+                and col.server_default is None
+                and col.server_onupdate is None
+                for col in prop.columns
+            )
+        ):
+            snapshot[prop.key] = None
+    return snapshot
+
+
+def _get_watched_fields(cls: type) -> tuple[str, ...] | None:
+    """Return the watched fields for *cls*."""
+    fields = getattr(cls, "__watched_fields__", None)
+    if fields is not None and (
+        not isinstance(fields, tuple) or not all(isinstance(f, str) for f in fields)
+    ):
+        raise TypeError(
+            f"{cls.__name__}.__watched_fields__ must be a tuple[str, ...], "
+            f"got {type(fields).__name__}"
+        )
+    return fields
 
 
 def _upsert_changes(
@@ -85,32 +127,30 @@ def _upsert_changes(
 
 @event.listens_for(AsyncSession.sync_session_class, "after_flush")
 def _after_flush(session: Any, flush_context: Any) -> None:
-    # New objects: capture references while session.new is still populated.
-    # Values are read in _after_flush_postexec once RETURNING has been processed.
+    # New objects: capture reference. Attributes will be refreshed after commit.
     for obj in session.new:
-        if isinstance(obj, WatchedFieldsMixin):
-            session.info.setdefault(_SESSION_PENDING_NEW, []).append(obj)
+        if _get_handlers(type(obj), ModelEvent.CREATE):
+            session.info.setdefault(_SESSION_CREATES, []).append(obj)
 
-    # Deleted objects: capture before they leave the identity map.
+    # Deleted objects: snapshot now while attributes are still loaded.
     for obj in session.deleted:
-        if isinstance(obj, WatchedFieldsMixin):
-            session.info.setdefault(_SESSION_DELETES, []).append(obj)
+        if _get_handlers(type(obj), ModelEvent.DELETE):
+            snapshot = _snapshot_column_attrs(obj)
+            session.info.setdefault(_SESSION_DELETES, []).append((obj, snapshot))
 
     # Dirty objects: read old/new from SQLAlchemy attribute history.
     for obj in session.dirty:
-        if not isinstance(obj, WatchedFieldsMixin):
+        if not _get_handlers(type(obj), ModelEvent.UPDATE):
             continue
 
-        # None = not in dict = watch all fields; list = specific fields only
-        watched = _WATCHED_FIELDS.get(type(obj))
+        watched = _get_watched_fields(type(obj))
         changes: dict[str, dict[str, Any]] = {}
 
+        inst_attrs = sa_inspect(obj).attrs
         attrs = (
-            # Specific fields
-            ((field, sa_inspect(obj).attrs[field]) for field in watched)
+            ((field, inst_attrs[field]) for field in watched)
             if watched is not None
-            # All mapped fields
-            else ((s.key, s) for s in sa_inspect(obj).attrs)
+            else ((s.key, s) for s in inst_attrs)
         )
         for field, attr_state in attrs:
             history = attr_state.history
@@ -128,104 +168,137 @@ def _after_flush(session: Any, flush_context: Any) -> None:
             )
 
 
-@event.listens_for(AsyncSession.sync_session_class, "after_flush_postexec")
-def _after_flush_postexec(session: Any, flush_context: Any) -> None:
-    # New objects are now persistent and RETURNING values have been applied,
-    # so server defaults (id, created_at, …) are available via getattr.
-    pending_new: list[Any] = session.info.pop(_SESSION_PENDING_NEW, [])
-    if not pending_new:
-        return
-    session.info.setdefault(_SESSION_CREATES, []).extend(pending_new)
-
-
 @event.listens_for(AsyncSession.sync_session_class, "after_rollback")
 def _after_rollback(session: Any) -> None:
-    session.info.pop(_SESSION_PENDING_NEW, None)
+    if session.in_transaction():
+        return
     session.info.pop(_SESSION_CREATES, None)
     session.info.pop(_SESSION_DELETES, None)
     session.info.pop(_SESSION_UPDATES, None)
 
 
-def _task_error_handler(task: asyncio.Task[Any]) -> None:
-    if not task.cancelled() and (exc := task.exception()):
-        _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
-
-
-def _schedule_with_snapshot(
-    loop: asyncio.AbstractEventLoop, obj: Any, fn: Any, *args: Any
+async def _invoke_callback(
+    fn: Callable[..., Any],
+    obj: Any,
+    event_type: ModelEvent,
+    changes: dict[str, dict[str, Any]] | None,
 ) -> None:
-    """Snapshot *obj*'s column attrs now (before expire_on_commit wipes them),
-    then schedule a coroutine that restores the snapshot and calls *fn*.
-    """
-    snapshot = _snapshot_column_attrs(obj)
-
-    async def _run(
-        obj: Any = obj,
-        fn: Any = fn,
-        snapshot: dict[str, Any] = snapshot,
-        args: tuple = args,
-    ) -> None:
-        for key, value in snapshot.items():
-            _sa_set_committed_value(obj, key, value)
-        try:
-            result = fn(*args)
-            if asyncio.iscoroutine(result):
-                await result
-        except Exception as exc:
-            _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
-
-    task = loop.create_task(_run())
-    task.add_done_callback(_task_error_handler)
+    """Call *fn* and await the result if it is awaitable."""
+    result = fn(obj, event_type, changes)
+    if inspect.isawaitable(result):
+        await result
 
 
-@event.listens_for(AsyncSession.sync_session_class, "after_commit")
-def _after_commit(session: Any) -> None:
-    creates: list[Any] = session.info.pop(_SESSION_CREATES, [])
-    deletes: list[Any] = session.info.pop(_SESSION_DELETES, [])
-    field_changes: dict[int, tuple[Any, dict[str, dict[str, Any]]]] = session.info.pop(
-        _SESSION_UPDATES, {}
+async def _batch_reload(
+    session: AsyncSession, model: type, pk_tuples: list[tuple[Any, ...]]
+) -> None:
+    """Re-populate all rows of *model* identified by *pk_tuples* in one round trip."""
+    pk_cols = sa_inspect(model, raiseerr=True).primary_key
+    where = (
+        pk_cols[0].in_([pk[0] for pk in pk_tuples])
+        if len(pk_cols) == 1
+        else tuple_(*pk_cols).in_(pk_tuples)
     )
-
-    if not creates and not deletes and not field_changes:
-        return
-
-    try:
-        loop = asyncio.get_running_loop()
-    except RuntimeError:
-        return
-
-    for obj in creates:
-        _schedule_with_snapshot(loop, obj, obj.on_create)
-
-    for obj in deletes:
-        _schedule_with_snapshot(loop, obj, obj.on_delete)
-
-    for obj, changes in field_changes.values():
-        _schedule_with_snapshot(loop, obj, obj.on_update, changes)
+    q = select(model).where(where).execution_options(populate_existing=True)
+    await session.execute(q)
 
 
-class WatchedFieldsMixin:
-    """Mixin that enables lifecycle callbacks for SQLAlchemy models."""
+class EventSession(AsyncSession):
+    """AsyncSession subclass that dispatches lifecycle callbacks after commit."""
 
-    def on_event(
-        self, event: ModelEvent, changes: dict[str, dict[str, Any]] | None = None
-    ) -> Awaitable[None] | None:
-        """Catch-all callback fired for every lifecycle event.
+    async def commit(self) -> None:
+        await super().commit()
 
-        Args:
-            event: The event type (:attr:`ModelEvent.CREATE`, :attr:`ModelEvent.DELETE`,
-                or :attr:`ModelEvent.UPDATE`).
-            changes: Field changes for :attr:`ModelEvent.UPDATE`, ``None`` otherwise.
-        """
+        creates: list[Any] = self.info.pop(_SESSION_CREATES, [])
+        deletes: list[tuple[Any, dict[str, Any]]] = self.info.pop(_SESSION_DELETES, [])
+        field_changes: dict[int, tuple[Any, dict[str, dict[str, Any]]]] = self.info.pop(
+            _SESSION_UPDATES, {}
+        )
 
-    def on_create(self) -> Awaitable[None] | None:
-        """Called after INSERT commit."""
-        return self.on_event(ModelEvent.CREATE)
+        if not creates and not deletes and not field_changes:
+            return
 
-    def on_delete(self) -> Awaitable[None] | None:
-        """Called after DELETE commit."""
-        return self.on_event(ModelEvent.DELETE)
+        # Suppress transient objects (created + deleted in same transaction).
+        if creates and deletes:
+            created_ids = {id(o) for o in creates}
+            deleted_ids = {id(o) for o, _ in deletes}
+            transient_ids = created_ids & deleted_ids
+            if transient_ids:
+                creates = [o for o in creates if id(o) not in transient_ids]
+                deletes = [(o, s) for o, s in deletes if id(o) not in transient_ids]
+                field_changes = {
+                    k: v for k, v in field_changes.items() if k not in transient_ids
+                }
 
-    def on_update(self, changes: dict[str, dict[str, Any]]) -> Awaitable[None] | None:
-        """Called after UPDATE commit when watched fields change."""
-        return self.on_event(ModelEvent.UPDATE, changes=changes)
+        # Suppress updates for deleted objects (row is gone, refresh would fail).
+        if deletes and field_changes:
+            deleted_ids = {id(o) for o, _ in deletes}
+            field_changes = {
+                k: v for k, v in field_changes.items() if k not in deleted_ids
+            }
+
+        # Suppress updates for newly created objects (CREATE-only semantics).
+        if creates and field_changes:
+            create_ids = {id(o) for o in creates}
+            field_changes = {
+                k: v for k, v in field_changes.items() if k not in create_ids
+            }
+
+        # Resolve reloadable state up front and group PKs by model type so
+        # the post-commit reload is one query per type instead of one
+        # session.get() per object.
+        create_items: list[Any] = []
+        update_items: list[tuple[Any, dict[str, dict[str, Any]]]] = []
+        pk_by_type: dict[type, list[tuple[Any, ...]]] = {}
+
+        for obj in creates:
+            state = sa_inspect(obj, raiseerr=False)
+            if state is None or state.detached or state.transient:  # pragma: no cover
+                continue
+            create_items.append(obj)
+            pk_by_type.setdefault(type(obj), []).append(state.key[1])
+
+        for obj, changes in field_changes.values():
+            state = sa_inspect(obj, raiseerr=False)
+            if state is None or state.detached or state.transient:  # pragma: no cover
+                continue
+            update_items.append((obj, changes))
+            pk_by_type.setdefault(type(obj), []).append(state.key[1])
+
+        for model, pk_tuples in pk_by_type.items():
+            try:
+                await _batch_reload(self, model, pk_tuples)
+            except Exception as exc:
+                _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
+
+        # Dispatch CREATE callbacks.
+        for obj in create_items:
+            try:
+                for handler in _get_handlers(type(obj), ModelEvent.CREATE):
+                    await _invoke_callback(handler, obj, ModelEvent.CREATE, None)
+            except Exception as exc:
+                _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
+
+        # Dispatch DELETE callbacks (restore snapshot; row is gone).
+        for obj, snapshot in deletes:
+            try:
+                for key, value in snapshot.items():
+                    _sa_set_committed_value(obj, key, value)
+                for handler in _get_handlers(type(obj), ModelEvent.DELETE):
+                    await _invoke_callback(handler, obj, ModelEvent.DELETE, None)
+            except Exception as exc:
+                _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
+
+        # Dispatch UPDATE callbacks.
+        for obj, changes in update_items:
+            try:
+                for handler in _get_handlers(type(obj), ModelEvent.UPDATE):
+                    await _invoke_callback(handler, obj, ModelEvent.UPDATE, changes)
+            except Exception as exc:
+                _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
+
+    async def rollback(self) -> None:
+        await super().rollback()
+        self.info.pop(_SESSION_CREATES, None)
+        self.info.pop(_SESSION_DELETES, None)
+        self.info.pop(_SESSION_UPDATES, None)

src/fastapi_toolsets/pytest/plugin.py

@@ -1,14 +1,14 @@
 """Pytest plugin for using FixtureRegistry fixtures in tests."""
 
-from collections.abc import Callable, Sequence
+from collections.abc import Sequence
 from typing import Any
 
 import pytest
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 
-from ..db import get_transaction
 from ..fixtures import FixtureRegistry, LoadStrategy
+from ..fixtures.utils import _get_primary_key, _load_ordered, _refresh_loaded
 
 
 def register_fixtures(
@@ -55,7 +55,7 @@ def register_fixtures(
 
         # Build list of pytest fixture dependencies
         pytest_deps = [session_fixture]
-        for dep in fixture.depends_on:
+        for dep in registry.get_dependencies(fixture.name):
             pytest_deps.append(f"{prefix}{dep}")
 
         # Create the fixture function
@@ -81,51 +81,38 @@ def _create_fixture_function(
     fixture_name: str,
     dependencies: list[str],
     strategy: LoadStrategy,
-) -> Callable[..., Any]:
+) -> Any:
     """Create a fixture function with the correct signature.
 
     The function signature must include all dependencies as parameters
-    for pytest to resolve them correctly.
+    for pytest (and pytest-anyio's fixture chaining) to resolve them
+    correctly — dynamic resolution via ``request.getfixturevalue`` deadlocks
+    when called from inside an already-running async fixture.
     """
-    # Get the fixture definition
     fixture_def = registry.get(fixture_name)
 
-    # Build the function dynamically with correct parameters
-    # We need the session as first param, then all dependencies
     async def fixture_func(**kwargs: Any) -> Sequence[DeclarativeBase]:
-        # Get session from kwargs (first dependency)
         session: AsyncSession = kwargs[dependencies[0]]
+        result = (await _load_ordered(session, registry, [fixture_name], strategy))[
+            fixture_name
+        ]
 
-        # Load the fixture data
-        instances = list(fixture_def.func())
+        if strategy is LoadStrategy.SKIP_EXISTING:
+            # _load_ordered only returns newly-inserted rows for this
+            # strategy (the CLI seeding contract). A test fixture should
+            # still hand back the full, usable set including rows that
+            # were already present, so top up with those.
+            declared = list(fixture_def.func())
+            result_pks = {_get_primary_key(r) for r in result}
+            missing = [
+                d
+                for d in declared
+                if (pk := _get_primary_key(d)) is not None and pk not in result_pks
+            ]
+            if missing:
+                result = result + await _refresh_loaded(session, missing)
 
-        if not instances:
-            return []
-
-        loaded: list[DeclarativeBase] = []
-
-        async with get_transaction(session):
-            for instance in instances:
-                if strategy == LoadStrategy.INSERT:
-                    session.add(instance)
-                    loaded.append(instance)
-                elif strategy == LoadStrategy.MERGE:
-                    merged = await session.merge(instance)
-                    loaded.append(merged)
-                elif strategy == LoadStrategy.SKIP_EXISTING:
-                    pk = _get_primary_key(instance)
-                    if pk is not None:
-                        existing = await session.get(type(instance), pk)
-                        if existing is None:
-                            session.add(instance)
-                            loaded.append(instance)
-                        else:
-                            loaded.append(existing)
-                    else:
-                        session.add(instance)
-                        loaded.append(instance)
-
-        return loaded
+        return result
 
     # Update function signature to include dependencies
     # This is needed for pytest to inject the right fixtures
@@ -139,17 +126,3 @@ def _create_fixture_function(
     created_func.__doc__ = f"Load {fixture_name} fixture data."
 
     return created_func
-
-
-def _get_primary_key(instance: DeclarativeBase) -> Any | None:
-    """Get the primary key value of a model instance."""
-    mapper = instance.__class__.__mapper__
-    pk_cols = mapper.primary_key
-
-    if len(pk_cols) == 1:
-        return getattr(instance, pk_cols[0].name, None)
-
-    pk_values = tuple(getattr(instance, col.name, None) for col in pk_cols)
-    if all(v is not None for v in pk_values):
-        return pk_values
-    return None

src/fastapi_toolsets/pytest/utils.py

@@ -1,13 +1,13 @@
 """Pytest helper utilities for FastAPI testing."""
 
 import os
-import warnings
 from collections.abc import AsyncGenerator, Callable
 from contextlib import asynccontextmanager
 from typing import Any
 
 from httpx import ASGITransport, AsyncClient
-from sqlalchemy.engine import make_url
+from sqlalchemy import text
+from sqlalchemy.engine import URL, make_url
 from sqlalchemy.ext.asyncio import (
     AsyncSession,
     async_sessionmaker,
@@ -15,33 +15,8 @@ from sqlalchemy.ext.asyncio import (
 )
 from sqlalchemy.orm import DeclarativeBase
 
-from sqlalchemy import text
-
-from ..db import (
-    cleanup_tables as _cleanup_tables,
-    create_database,
-    create_db_context,
-)
-
-
-async def cleanup_tables(
-    session: AsyncSession,
-    base: type[DeclarativeBase],
-) -> None:
-    """Truncate all tables for fast between-test cleanup.
-
-    .. deprecated::
-        Import ``cleanup_tables`` from ``fastapi_toolsets.db`` instead.
-        This re-export will be removed in v3.0.0.
-    """
-    warnings.warn(
-        "Importing cleanup_tables from fastapi_toolsets.pytest is deprecated "
-        "and will be removed in v3.0.0. "
-        "Use 'from fastapi_toolsets.db import cleanup_tables' instead.",
-        DeprecationWarning,
-        stacklevel=2,
-    )
-    await _cleanup_tables(session=session, base=base)
+from ..db.testing import cleanup_tables, create_database
+from ..models.watched import EventSession
 
 
 def _get_xdist_worker(default_test_db: str) -> str:
@@ -59,12 +34,18 @@ def _get_xdist_worker(default_test_db: str) -> str:
     return os.environ.get("PYTEST_XDIST_WORKER", default_test_db)
 
 
-def worker_database_url(database_url: str, default_test_db: str) -> str:
+def worker_database_url(
+    database_url: str,
+    default_test_db: str,
+    *,
+    prefix: str | None = None,
+) -> str:
     """Derive a per-worker database URL for pytest-xdist parallel runs.
 
-    Appends ``_{worker_name}`` to the database name so each xdist worker
-    operates on its own database.  When not running under xdist,
-    ``_{default_test_db}`` is appended instead.
+    Sets the database name to the worker name so each xdist worker operates
+    on its own database.  When not running under xdist, *default_test_db* is
+    used instead.  When *prefix* is provided, the name becomes
+    ``{prefix}_{worker}``.
 
     The worker name is read from the ``PYTEST_XDIST_WORKER`` environment
     variable (set automatically by xdist in each worker process).
@@ -73,6 +54,9 @@ def worker_database_url(database_url: str, default_test_db: str) -> str:
         database_url: Original database connection URL.
         default_test_db: Suffix appended to the database name when
             ``PYTEST_XDIST_WORKER`` is not set.
+        prefix: Optional prefix prepended to the worker name
+            (e.g. ``"test"`` → ``"test_gw0"``).  Without it, the database
+            name is just the worker name (e.g. ``"gw0"``).
 
     Returns:
         A database URL with a worker- or default-specific database name.
@@ -80,7 +64,8 @@ def worker_database_url(database_url: str, default_test_db: str) -> str:
     worker = _get_xdist_worker(default_test_db=default_test_db)
 
     url = make_url(database_url)
-    url = url.set(database=f"{url.database}_{worker}")
+    db_name = f"{prefix}_{worker}" if prefix else worker
+    url = url.set(database=db_name)
     return url.render_as_string(hide_password=False)
 
 
@@ -88,6 +73,9 @@ def worker_database_url(database_url: str, default_test_db: str) -> str:
 async def create_worker_database(
     database_url: str,
     default_test_db: str = "test_db",
+    *,
+    prefix: str | None = None,
+    server_url: str | None = None,
 ) -> AsyncGenerator[str, None]:
     """Create and drop a per-worker database for pytest-xdist isolation.
 
@@ -99,10 +87,16 @@ async def create_worker_database(
     name (e.g. ``_gw0``).  Otherwise it is suffixed with *default_test_db*.
 
     Args:
-        database_url: Original database connection URL (used as the server
-            connection and as the base for the worker database name).
+        database_url: Original database connection URL (used as the base for
+            the worker database name).
         default_test_db: Suffix appended to the database name when
             ``PYTEST_XDIST_WORKER`` is not set. Defaults to ``"test_db"``.
+        prefix: Optional prefix prepended to the worker name
+            (e.g. ``prefix="test"`` → ``"test_gw0"``).  Without it, the
+            database name is just the worker name (e.g. ``"gw0"``).
+        server_url: URL used for server-level DDL (must point to an existing
+            database on the same server).  Defaults to *database_url* with the
+            database omitted, letting asyncpg fall back to the username.
 
     Yields:
         The worker-specific database URL.
@@ -111,7 +105,7 @@ async def create_worker_database(
         ```python
         from fastapi_toolsets.pytest import create_worker_database, create_db_session
 
-        DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost/test_db"
+        DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost/myapp"
 
         @pytest.fixture(scope="session")
         async def worker_db_url():
@@ -127,20 +121,35 @@ async def create_worker_database(
         ```
     """
     worker_url = worker_database_url(
-        database_url=database_url, default_test_db=default_test_db
+        database_url=database_url, default_test_db=default_test_db, prefix=prefix
     )
-    worker_db_name: str = make_url(worker_url).database  # type: ignore[assignment]
+    worker_db_name = make_url(worker_url).database
+    assert worker_db_name is not None
 
-    engine = create_async_engine(database_url, isolation_level="AUTOCOMMIT")
+    _parsed = make_url(database_url)
+    _server_url = server_url or URL.create(
+        drivername=_parsed.drivername,
+        username=_parsed.username,
+        password=_parsed.password,
+        host=_parsed.host,
+        port=_parsed.port,
+        query=_parsed.query,
+    ).render_as_string(hide_password=False)
+
+    engine = create_async_engine(_server_url, isolation_level="AUTOCOMMIT")
     try:
         async with engine.connect() as conn:
-            await conn.execute(text(f"DROP DATABASE IF EXISTS {worker_db_name}"))
-        await create_database(db_name=worker_db_name, server_url=database_url)
+            await conn.execute(
+                text(f"DROP DATABASE IF EXISTS {worker_db_name} WITH (FORCE)")
+            )
+        await create_database(db_name=worker_db_name, server_url=_server_url)
 
         yield worker_url
 
         async with engine.connect() as conn:
-            await conn.execute(text(f"DROP DATABASE IF EXISTS {worker_db_name}"))
+            await conn.execute(
+                text(f"DROP DATABASE IF EXISTS {worker_db_name} WITH (FORCE)")
+            )
     finally:
         await engine.dispose()
 
@@ -150,6 +159,7 @@ async def create_async_client(
     app: Any,
     base_url: str = "http://test",
     dependency_overrides: dict[Callable[..., Any], Callable[..., Any]] | None = None,
+    **kwargs: Any,
 ) -> AsyncGenerator[AsyncClient, None]:
     """Create an async httpx client for testing FastAPI applications.
 
@@ -159,6 +169,9 @@ async def create_async_client(
         dependency_overrides: Optional mapping of original dependencies to
             their test replacements. Applied via ``app.dependency_overrides``
             before yielding and cleaned up after.
+        **kwargs: Additional keyword arguments forwarded to
+            :class:`httpx.AsyncClient` (e.g. ``headers``, ``cookies``,
+            ``auth``, ``timeout``).
 
     Yields:
         An AsyncClient configured for the app.
@@ -206,7 +219,9 @@ async def create_async_client(
 
     transport = ASGITransport(app=app)
     try:
-        async with AsyncClient(transport=transport, base_url=base_url) as client:
+        async with AsyncClient(
+            transport=transport, base_url=base_url, **kwargs
+        ) as client:
             yield client
     finally:
         if dependency_overrides:
@@ -223,6 +238,8 @@ async def create_db_session(
     expire_on_commit: bool = False,
     drop_tables: bool = True,
     cleanup: bool = False,
+    engine_kwargs: dict[str, Any] | None = None,
+    session_kwargs: dict[str, Any] | None = None,
 ) -> AsyncGenerator[AsyncSession, None]:
     """Create a database session for testing.
 
@@ -237,6 +254,12 @@ async def create_db_session(
         drop_tables: Drop tables after test. Defaults to True.
         cleanup: Truncate all tables after test using
             :func:`cleanup_tables`. Defaults to False.
+        engine_kwargs: Additional keyword arguments forwarded to
+            :func:`sqlalchemy.ext.asyncio.create_async_engine`
+            (e.g. ``pool_size``, ``connect_args``).
+        session_kwargs: Additional keyword arguments forwarded to
+            :class:`sqlalchemy.ext.asyncio.async_sessionmaker`
+            (e.g. ``autoflush``, ``class_``).
 
     Yields:
         An AsyncSession ready for database operations.
@@ -261,22 +284,23 @@ async def create_db_session(
             await db_session.commit()
         ```
     """
-    engine = create_async_engine(database_url, echo=echo)
+    engine = create_async_engine(database_url, echo=echo, **(engine_kwargs or {}))
 
     try:
-        # Create tables
         async with engine.begin() as conn:
             await conn.run_sync(base.metadata.create_all)
 
-        # Create session using existing db context utility
-        session_maker = async_sessionmaker(engine, expire_on_commit=expire_on_commit)
-        get_session = create_db_context(session_maker)
-
-        async with get_session() as session:
+        session_maker = async_sessionmaker(
+            engine,
+            expire_on_commit=expire_on_commit,
+            class_=EventSession,
+            **(session_kwargs or {}),
+        )
+        async with session_maker() as session:
             yield session
 
             if cleanup:
-                await cleanup_tables(session, base)
+                await cleanup_tables(session=session, base=base)
 
         if drop_tables:
             async with engine.begin() as conn:

src/fastapi_toolsets/schemas.py

@@ -1,19 +1,20 @@
 """Base Pydantic schemas for API responses."""
 
+import math
 from enum import Enum
-from typing import Annotated, Any, ClassVar, Generic, Literal, TypeVar, Union
+from typing import Annotated, Any, ClassVar, Generic, Literal, TypeVar
 
-from pydantic import BaseModel, ConfigDict, Field
+from pydantic import BaseModel, ConfigDict, Field, computed_field
 
 from .types import DataT
 
 __all__ = [
     "ApiError",
-    "CursorPagination",
     "CursorPaginatedResponse",
+    "CursorPagination",
     "ErrorResponse",
-    "OffsetPagination",
     "OffsetPaginatedResponse",
+    "OffsetPagination",
     "PaginatedResponse",
     "PaginationType",
     "PydanticBase",
@@ -98,17 +99,29 @@ class OffsetPagination(PydanticBase):
     """Pagination metadata for offset-based list responses.
 
     Attributes:
-        total_count: Total number of items across all pages
+        total_count: Total number of items across all pages.
+            ``None`` when ``include_total=False``.
         items_per_page: Number of items per page
         page: Current page number (1-indexed)
         has_more: Whether there are more pages
+        pages: Total number of pages
     """
 
-    total_count: int
+    total_count: int | None
     items_per_page: int
     page: int
     has_more: bool
 
+    @computed_field
+    @property
+    def pages(self) -> int | None:
+        """Total number of pages, or ``None`` when ``total_count`` is unknown."""
+        if self.total_count is None:
+            return None
+        if self.items_per_page == 0:
+            return 0
+        return math.ceil(self.total_count / self.items_per_page)
+
 
 class CursorPagination(PydanticBase):
     """Pagination metadata for cursor-based list responses.
@@ -149,22 +162,24 @@ class PaginatedResponse(BaseResponse, Generic[DataT]):
     pagination: OffsetPagination | CursorPagination
     pagination_type: PaginationType | None = None
     filter_attributes: dict[str, list[Any]] | None = None
+    search_columns: list[str] | None = None
+    order_columns: list[str] | None = None
 
     _discriminated_union_cache: ClassVar[dict[Any, Any]] = {}
 
-    def __class_getitem__(  # type: ignore[invalid-method-override]
+    def __class_getitem__(  # ty:ignore[invalid-method-override]
         cls, item: type[Any] | tuple[type[Any], ...]
     ) -> type[Any]:
         if cls is PaginatedResponse and not isinstance(item, TypeVar):
             cached = cls._discriminated_union_cache.get(item)
             if cached is None:
                 cached = Annotated[
-                    Union[CursorPaginatedResponse[item], OffsetPaginatedResponse[item]],  # type: ignore[invalid-type-form]
+                    CursorPaginatedResponse[item] | OffsetPaginatedResponse[item],  # ty:ignore[invalid-type-form]
                     Field(discriminator="pagination_type"),
                 ]
                 cls._discriminated_union_cache[item] = cached
-            return cached  # type: ignore[invalid-return-type]
-        return super().__class_getitem__(item)
+            return cached  # ty:ignore[invalid-return-type]
+        return super().__class_getitem__(item)  # ty:ignore[invalid-return-type]
 
 
 class OffsetPaginatedResponse(PaginatedResponse[DataT]):

src/fastapi_toolsets/types.py

@@ -15,13 +15,14 @@ ModelType = TypeVar("ModelType", bound=DeclarativeBase)
 SchemaType = TypeVar("SchemaType", bound=BaseModel)
 
 # CRUD type aliases
-JoinType = list[tuple[type[DeclarativeBase], Any]]
+JoinType = list[tuple[type[DeclarativeBase] | Any, Any]]
 M2MFieldType = Mapping[str, QueryableAttribute[Any]]
 OrderByClause = ColumnElement[Any] | QueryableAttribute[Any]
 
-# Search / facet type aliases
+# Search / facet / order type aliases
 SearchFieldType = InstrumentedAttribute[Any] | tuple[InstrumentedAttribute[Any], ...]
 FacetFieldType = SearchFieldType
+OrderFieldType = SearchFieldType
 
 # Dependency type aliases
 SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]] | Any

tests/conftest.py

@@ -1,14 +1,15 @@
 """Shared pytest fixtures for fastapi-utils tests."""
 
+import datetime
+import decimal
 import os
 import uuid
+from enum import Enum
 
 import pytest
 from pydantic import BaseModel
-import datetime
-import decimal
-
 from sqlalchemy import (
+    JSON,
     Column,
     Date,
     DateTime,
@@ -19,6 +20,10 @@ from sqlalchemy import (
     Table,
     Uuid,
 )
+from sqlalchemy import (
+    Enum as SAEnum,
+)
+from sqlalchemy.dialects.postgresql import ARRAY
 from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
@@ -34,8 +39,6 @@ DATABASE_URL = os.getenv(
 class Base(DeclarativeBase):
     """Base class for test models."""
 
-    pass
-
 
 class Role(Base):
     """Test role model."""
@@ -57,6 +60,7 @@ class User(Base):
     username: Mapped[str] = mapped_column(String(50), unique=True)
     email: Mapped[str] = mapped_column(String(100), unique=True)
     is_active: Mapped[bool] = mapped_column(default=True)
+    notes: Mapped[str | None]
     role_id: Mapped[uuid.UUID | None] = mapped_column(
         ForeignKey("roles.id"), nullable=True
     )
@@ -136,6 +140,86 @@ class Post(Base):
     tags: Mapped[list[Tag]] = relationship(secondary=post_tags)
 
 
+class OrderStatus(int, Enum):
+    """Integer-backed enum for order status."""
+
+    PENDING = 1
+    PROCESSING = 2
+    SHIPPED = 3
+    CANCELLED = 4
+
+
+class Color(str, Enum):
+    """String-backed enum for color."""
+
+    RED = "red"
+    GREEN = "green"
+    BLUE = "blue"
+
+
+class Order(Base):
+    """Test model with an IntEnum column (Enum(int, Enum)) and a raw Integer column."""
+
+    __tablename__ = "orders"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
+    name: Mapped[str] = mapped_column(String(100))
+    status: Mapped[OrderStatus] = mapped_column(SAEnum(OrderStatus))
+    priority: Mapped[int] = mapped_column(Integer)
+    color: Mapped[Color] = mapped_column(SAEnum(Color))
+
+
+class Transfer(Base):
+    """Test model with two FKs to the same table (users)."""
+
+    __tablename__ = "transfers"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
+    amount: Mapped[str] = mapped_column(String(50))
+    sender_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"))
+    receiver_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"))
+
+
+class Article(Base):
+    """Test article model with ARRAY and JSON columns."""
+
+    __tablename__ = "articles"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
+    title: Mapped[str] = mapped_column(String(200))
+    labels: Mapped[list[str]] = mapped_column(ARRAY(String))
+    metadata_: Mapped[dict | None] = mapped_column("metadata", JSON, nullable=True)
+
+
+class Challenge(Base):
+    """Base challenge model (root of joined-table inheritance hierarchy)."""
+
+    __tablename__ = "challenges"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
+    title: Mapped[str] = mapped_column(String(200))
+    challenge_type: Mapped[str] = mapped_column(String(50))
+    points: Mapped[int] = mapped_column(Integer, default=0)
+
+    __mapper_args__ = {
+        "polymorphic_on": "challenge_type",
+        "polymorphic_identity": "challenge",
+    }
+
+
+class ChallengeStandard(Challenge):
+    """Standard challenge — child table in joined-table inheritance."""
+
+    __tablename__ = "challenge_standard"
+
+    id: Mapped[uuid.UUID] = mapped_column(ForeignKey("challenges.id"), primary_key=True)
+    difficulty: Mapped[str] = mapped_column(String(50))
+
+    __mapper_args__ = {
+        "polymorphic_identity": "standard",
+    }
+
+
 class RoleCreate(BaseModel):
     """Schema for creating a role."""
 
@@ -270,6 +354,61 @@ class ProductCreate(BaseModel):
     price: decimal.Decimal
 
 
+class ArticleCreate(BaseModel):
+    """Schema for creating an article."""
+
+    id: uuid.UUID | None = None
+    title: str
+    labels: list[str] = []
+
+
+class ArticleRead(PydanticBase):
+    """Schema for reading an article."""
+
+    id: uuid.UUID
+    title: str
+    labels: list[str]
+
+
+class OrderCreate(BaseModel):
+    """Schema for creating an order."""
+
+    id: uuid.UUID | None = None
+    name: str
+    status: OrderStatus
+    priority: int = 0
+    color: Color = Color.RED
+
+
+class OrderRead(PydanticBase):
+    """Schema for reading an order."""
+
+    id: uuid.UUID
+    name: str
+    status: OrderStatus
+    priority: int
+    color: Color
+
+
+class TransferCreate(BaseModel):
+    """Schema for creating a transfer."""
+
+    id: uuid.UUID | None = None
+    amount: str
+    sender_id: uuid.UUID
+    receiver_id: uuid.UUID
+
+
+class TransferRead(PydanticBase):
+    """Schema for reading a transfer."""
+
+    id: uuid.UUID
+    amount: str
+
+
+OrderCrud = CrudFactory(Order)
+TransferCrud = CrudFactory(Transfer)
+ArticleCrud = CrudFactory(Article)
 RoleCrud = CrudFactory(Role)
 RoleCursorCrud = CrudFactory(Role, cursor_column=Role.id)
 IntRoleCursorCrud = CrudFactory(IntRole, cursor_column=IntRole.id)
@@ -299,6 +438,21 @@ async def engine():
     await engine.dispose()
 
 
+@pytest.fixture(scope="function")
+async def session_maker(engine):
+    """Provide a session factory with tables created and dropped around the test."""
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+    factory = async_sessionmaker(engine, expire_on_commit=False)
+
+    try:
+        yield factory
+    finally:
+        async with engine.begin() as conn:
+            await conn.run_sync(Base.metadata.drop_all)
+
+
 @pytest.fixture(scope="function")
 async def db_session(engine):
     """Create a test database session with tables.
@@ -323,28 +477,24 @@ async def db_session(engine):
             await conn.run_sync(Base.metadata.drop_all)
 
 
-@pytest.fixture
-def sample_role_data() -> RoleCreate:
-    """Sample role creation data."""
-    return RoleCreate(name="admin")
+@pytest.fixture(scope="function")
+async def db_session_expire_on_commit(engine):
+    """Session with expire_on_commit=True (the SQLAlchemy default).
 
+    Attributes read off an instance after commit are expired and trigger an
+    implicit (sync) refresh under this setting — which fails under asyncio
+    with MissingGreenlet. The other ``db_session`` fixture uses
+    ``expire_on_commit=False`` and would not catch that class of bug.
+    """
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
 
-@pytest.fixture
-def sample_user_data() -> UserCreate:
-    """Sample user creation data."""
-    return UserCreate(
-        username="testuser",
-        email="test@example.com",
-        is_active=True,
-    )
+    session_factory = async_sessionmaker(engine, expire_on_commit=True)
+    session = session_factory()
 
-
-@pytest.fixture
-def sample_post_data() -> PostCreate:
-    """Sample post creation data."""
-    return PostCreate(
-        title="Test Post",
-        content="Test content",
-        is_published=True,
-        author_id=uuid.uuid4(),
-    )
+    try:
+        yield session
+    finally:
+        await session.close()
+        async with engine.begin() as conn:
+            await conn.run_sync(Base.metadata.drop_all)

tests/test_cli.py

@@ -277,6 +277,10 @@ class TestFixturesCli:
             '@registry.register(depends_on=["roles"], contexts=[Context.TESTING])\n'
             "def users():\n"
             '    return [{"id": 1, "name": "alice", "role_id": 1}]\n'
+            "\n"
+            '@registry.register(contexts=["staging"])\n'
+            "def staging_only():\n"
+            '    return [{"id": 3, "name": "staging-user"}]\n'
         )
 
         # Create db module
@@ -316,7 +320,7 @@ class TestFixturesCli:
         assert result.exit_code == 0
         assert "roles" in result.output
         assert "users" in result.output
-        assert "Total: 2 fixture(s)" in result.output
+        assert "Total: 3 fixture(s)" in result.output
 
     def test_fixtures_list_with_context(self, cli_env):
         """fixtures list --context filters by context."""
@@ -338,6 +342,27 @@ class TestFixturesCli:
         assert "roles" in result.output
         assert "[Dry run - no changes made]" in result.output
 
+    def test_fixtures_list_with_custom_context(self, cli_env):
+        """fixtures list --context accepts contexts outside the Context enum, and
+        always includes base fixtures alongside the requested context."""
+        tmp_path, cli = cli_env
+        result = runner.invoke(cli, ["fixtures", "list", "--context", "staging"])
+
+        assert result.exit_code == 0
+        assert "staging_only" in result.output
+        assert "roles" in result.output
+        assert "Total: 2 fixture(s)" in result.output
+
+    def test_fixtures_load_custom_context_dry_run(self, cli_env):
+        """fixtures load accepts a custom context argument outside the Context enum,
+        and always loads base fixtures alongside it."""
+        tmp_path, cli = cli_env
+        result = runner.invoke(cli, ["fixtures", "load", "staging", "--dry-run"])
+
+        assert result.exit_code == 0
+        assert "staging_only" in result.output
+        assert "roles" in result.output
+
     def test_fixtures_load_invalid_strategy(self, cli_env):
         """fixtures load with invalid strategy shows error."""
         tmp_path, cli = cli_env
@@ -529,7 +554,6 @@ class TestAsyncCommand:
         @async_command
         async def async_func() -> None:
             """This is a docstring."""
-            pass
 
         assert async_func.__doc__ == """This is a docstring."""
 

tests/test_crud.py

@@ -38,6 +38,10 @@ from .conftest import (
     Tag,
     TagCreate,
     TagCrud,
+    Transfer,
+    TransferCreate,
+    TransferCrud,
+    TransferRead,
     User,
     UserCreate,
     UserCrud,
@@ -211,6 +215,92 @@ class TestResolveLoadOptions:
         assert crud._resolve_load_options([]) == []
 
 
+class TestResolveSearchColumns:
+    """Tests for _resolve_search_columns logic."""
+
+    def test_returns_none_when_no_searchable_fields(self):
+        """Returns None when cls.searchable_fields is None and no search_fields passed."""
+
+        class AbstractCrud(AsyncCrud[User]):
+            pass
+
+        assert AbstractCrud._resolve_search_columns(None) is None
+
+    def test_returns_none_when_empty_search_fields_passed(self):
+        """Returns None when an empty list is passed explicitly."""
+        crud = CrudFactory(User)
+        assert crud._resolve_search_columns([]) is None
+
+    def test_returns_keys_from_class_searchable_fields(self):
+        """Returns column keys from cls.searchable_fields when no override passed."""
+        crud = CrudFactory(User, searchable_fields=[User.username])
+        result = crud._resolve_search_columns(None)
+        assert result is not None
+        assert "username" in result
+
+    def test_search_fields_override_takes_priority(self):
+        """Explicit search_fields override cls.searchable_fields."""
+        crud = CrudFactory(User, searchable_fields=[User.username])
+        result = crud._resolve_search_columns([User.email])
+        assert result is not None
+        assert "email" in result
+        assert "username" not in result
+
+
+class TestResolveOrderColumns:
+    """Tests for _resolve_order_columns logic."""
+
+    def test_returns_none_when_no_order_fields(self):
+        """Returns None when cls.order_fields is None and no order_fields passed."""
+
+        class AbstractCrud(AsyncCrud[User]):
+            pass
+
+        assert AbstractCrud._resolve_order_columns(None) is None
+
+    def test_returns_none_when_empty_order_fields_passed(self):
+        """Returns None when an empty list is passed explicitly."""
+        crud = CrudFactory(User)
+        assert crud._resolve_order_columns([]) is None
+
+    def test_returns_keys_from_class_order_fields(self):
+        """Returns sorted column keys from cls.order_fields when no override passed."""
+        crud = CrudFactory(User, order_fields=[User.username])
+        result = crud._resolve_order_columns(None)
+        assert result is not None
+        assert "username" in result
+
+    def test_order_fields_override_takes_priority(self):
+        """Explicit order_fields override cls.order_fields."""
+        crud = CrudFactory(User, order_fields=[User.username])
+        result = crud._resolve_order_columns([User.email])
+        assert result is not None
+        assert "email" in result
+        assert "username" not in result
+
+    def test_returns_sorted_keys(self):
+        """Keys are returned in sorted order."""
+        crud = CrudFactory(User, order_fields=[User.email, User.username])
+        result = crud._resolve_order_columns(None)
+        assert result is not None
+        assert result == sorted(result)
+
+    def test_relation_tuple_produces_dunder_key(self):
+        """A (rel, column) tuple produces a 'rel__column' key."""
+        crud = CrudFactory(User, order_fields=[(User.role, Role.name)])
+        result = crud._resolve_order_columns(None)
+        assert result == ["role__name"]
+
+    def test_mixed_flat_and_relation_fields(self):
+        """Flat and relation fields can be mixed; keys are sorted."""
+        crud = CrudFactory(User, order_fields=[User.username, (User.role, Role.name)])
+        result = crud._resolve_order_columns(None)
+        assert result is not None
+        assert "username" in result
+        assert "role__name" in result
+        assert result == sorted(result)
+
+
 class TestDefaultLoadOptionsIntegration:
     """Integration tests for default_load_options with real DB queries."""
 
@@ -290,6 +380,92 @@ class TestDefaultLoadOptionsIntegration:
         assert result.data[0].role is not None
         assert result.data[0].role.name == "admin"
 
+    @pytest.mark.anyio
+    async def test_default_load_options_applied_to_create(
+        self, db_session: AsyncSession
+    ):
+        """default_load_options loads relationships after create()."""
+        UserWithDefaultLoad = CrudFactory(
+            User, default_load_options=[selectinload(User.role)]
+        )
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        user = await UserWithDefaultLoad.create(
+            db_session,
+            UserCreate(username="alice", email="alice@test.com", role_id=role.id),
+        )
+        assert user.role is not None
+        assert user.role.name == "admin"
+
+    @pytest.mark.anyio
+    async def test_default_load_options_applied_to_update(
+        self, db_session: AsyncSession
+    ):
+        """default_load_options loads relationships after update()."""
+        UserWithDefaultLoad = CrudFactory(
+            User, default_load_options=[selectinload(User.role)]
+        )
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        user = await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="alice@test.com"),
+        )
+        updated = await UserWithDefaultLoad.update(
+            db_session,
+            UserUpdate(role_id=role.id),
+            filters=[User.id == user.id],
+        )
+        assert updated.role is not None
+        assert updated.role.name == "admin"
+
+    @pytest.mark.anyio
+    async def test_default_load_options_applied_to_create_expire_on_commit(
+        self, db_session_expire_on_commit: AsyncSession
+    ):
+        """create()'s reload uses captured PK values, not an expired instance attribute.
+
+        Regression test for MissingGreenlet: reading a PK off `db_model` after
+        commit under expire_on_commit=True (the SQLAlchemy default) would
+        trigger an implicit sync refresh, which fails under asyncio.
+        """
+        UserWithDefaultLoad = CrudFactory(
+            User, default_load_options=[selectinload(User.role)]
+        )
+        role = await RoleCrud.create(
+            db_session_expire_on_commit, RoleCreate(name="admin")
+        )
+        user = await UserWithDefaultLoad.create(
+            db_session_expire_on_commit,
+            UserCreate(username="alice", email="alice@test.com", role_id=role.id),
+        )
+        assert user.role is not None
+        assert user.role.name == "admin"
+
+    @pytest.mark.anyio
+    async def test_default_load_options_applied_to_update_expire_on_commit(
+        self, db_session_expire_on_commit: AsyncSession
+    ):
+        """update()'s reload uses captured PK values, not an expired instance attribute.
+
+        Regression test for MissingGreenlet under expire_on_commit=True.
+        """
+        UserWithDefaultLoad = CrudFactory(
+            User, default_load_options=[selectinload(User.role)]
+        )
+        role = await RoleCrud.create(
+            db_session_expire_on_commit, RoleCreate(name="admin")
+        )
+        user = await UserCrud.create(
+            db_session_expire_on_commit,
+            UserCreate(username="alice", email="alice@test.com"),
+        )
+        updated = await UserWithDefaultLoad.update(
+            db_session_expire_on_commit,
+            UserUpdate(role_id=role.id),
+            filters=[User.id == user.id],
+        )
+        assert updated.role is not None
+        assert updated.role.name == "admin"
+
     @pytest.mark.anyio
     async def test_load_options_overrides_default_load_options(
         self, db_session: AsyncSession
@@ -543,6 +719,28 @@ class TestCrudFirst:
         assert role is not None
         assert role.name == "admin"
 
+    @pytest.mark.anyio
+    async def test_first_with_for_update_nowait(self, db_session: AsyncSession):
+        """First with with_for_update='nowait' emits FOR UPDATE NOWAIT."""
+        await RoleCrud.create(db_session, RoleCreate(name="nowait_first"))
+
+        role = await RoleCrud.first(
+            db_session, [Role.name == "nowait_first"], with_for_update="nowait"
+        )
+        assert role is not None
+        assert role.name == "nowait_first"
+
+    @pytest.mark.anyio
+    async def test_first_with_for_update_skip_locked(self, db_session: AsyncSession):
+        """First with with_for_update='skip_locked' emits FOR UPDATE SKIP LOCKED."""
+        await RoleCrud.create(db_session, RoleCreate(name="skip_first"))
+
+        role = await RoleCrud.first(
+            db_session, [Role.name == "skip_first"], with_for_update="skip_locked"
+        )
+        assert role is not None
+        assert role.name == "skip_first"
+
 
 class TestCrudGetMulti:
     """Tests for CRUD get_multi operations."""
@@ -608,6 +806,45 @@ class TestCrudGetMulti:
         names = [r.name for r in roles]
         assert names == ["alpha", "bravo", "charlie"]
 
+    @pytest.mark.anyio
+    async def test_get_multi_with_for_update(self, db_session: AsyncSession):
+        """get_multi() with with_for_update=True locks the rows."""
+        await RoleCrud.create(db_session, RoleCreate(name="lock1"))
+        await RoleCrud.create(db_session, RoleCreate(name="lock2"))
+
+        roles = await RoleCrud.get_multi(
+            db_session,
+            filters=[Role.name.in_(["lock1", "lock2"])],
+            with_for_update=True,
+        )
+        assert len(roles) == 2
+
+    @pytest.mark.anyio
+    async def test_get_multi_with_for_update_nowait(self, db_session: AsyncSession):
+        """get_multi() with with_for_update='nowait' emits FOR UPDATE NOWAIT."""
+        await RoleCrud.create(db_session, RoleCreate(name="nowait_multi"))
+
+        roles = await RoleCrud.get_multi(
+            db_session,
+            filters=[Role.name == "nowait_multi"],
+            with_for_update="nowait",
+        )
+        assert len(roles) == 1
+
+    @pytest.mark.anyio
+    async def test_get_multi_with_for_update_skip_locked(
+        self, db_session: AsyncSession
+    ):
+        """get_multi() with with_for_update='skip_locked' emits FOR UPDATE SKIP LOCKED."""
+        await RoleCrud.create(db_session, RoleCreate(name="skip_multi"))
+
+        roles = await RoleCrud.get_multi(
+            db_session,
+            filters=[Role.name == "skip_multi"],
+            with_for_update="skip_locked",
+        )
+        assert len(roles) == 1
+
 
 class TestCrudUpdate:
     """Tests for CRUD update operations."""
@@ -654,6 +891,48 @@ class TestCrudUpdate:
         assert updated.email == "john@test.com"
         assert updated.is_active is True
 
+    @pytest.mark.anyio
+    async def test_update_with_for_update(self, db_session: AsyncSession):
+        """update() with with_for_update=True locks the row before writing."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="before"))
+
+        updated = await RoleCrud.update(
+            db_session,
+            RoleUpdate(name="after"),
+            [Role.id == role.id],
+            with_for_update=True,
+        )
+
+        assert updated.name == "after"
+
+    @pytest.mark.anyio
+    async def test_update_with_for_update_nowait(self, db_session: AsyncSession):
+        """update() with with_for_update='nowait' locks the row with NOWAIT."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="before_nowait"))
+
+        updated = await RoleCrud.update(
+            db_session,
+            RoleUpdate(name="after_nowait"),
+            [Role.id == role.id],
+            with_for_update="nowait",
+        )
+
+        assert updated.name == "after_nowait"
+
+    @pytest.mark.anyio
+    async def test_update_with_for_update_skip_locked(self, db_session: AsyncSession):
+        """update() with with_for_update='skip_locked' locks the row with SKIP LOCKED."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="before_skip"))
+
+        updated = await RoleCrud.update(
+            db_session,
+            RoleUpdate(name="after_skip"),
+            [Role.id == role.id],
+            with_for_update="skip_locked",
+        )
+
+        assert updated.name == "after_skip"
+
 
 class TestCrudDelete:
     """Tests for CRUD delete operations."""
@@ -1250,6 +1529,128 @@ class TestCrudJoins:
         assert users[0].username == "multi_join"
 
 
+class TestCrudAliasedJoins:
+    """Tests for CRUD operations with aliased joins (same table joined twice)."""
+
+    @pytest.mark.anyio
+    async def test_get_multi_with_aliased_joins(self, db_session: AsyncSession):
+        """Aliased joins allow joining the same table twice."""
+        from sqlalchemy.orm import aliased
+
+        alice = await UserCrud.create(
+            db_session, UserCreate(username="alice", email="alice@test.com")
+        )
+        bob = await UserCrud.create(
+            db_session, UserCreate(username="bob", email="bob@test.com")
+        )
+        await TransferCrud.create(
+            db_session,
+            TransferCreate(amount="100", sender_id=alice.id, receiver_id=bob.id),
+        )
+
+        Sender = aliased(User)
+        Receiver = aliased(User)
+
+        results = await TransferCrud.get_multi(
+            db_session,
+            joins=[
+                (Sender, Transfer.sender_id == Sender.id),
+                (Receiver, Transfer.receiver_id == Receiver.id),
+            ],
+            filters=[Sender.username == "alice", Receiver.username == "bob"],
+        )
+        assert len(results) == 1
+        assert results[0].amount == "100"
+
+    @pytest.mark.anyio
+    async def test_get_multi_aliased_no_match(self, db_session: AsyncSession):
+        """Aliased joins correctly filter out non-matching rows."""
+        from sqlalchemy.orm import aliased
+
+        alice = await UserCrud.create(
+            db_session, UserCreate(username="alice", email="alice@test.com")
+        )
+        bob = await UserCrud.create(
+            db_session, UserCreate(username="bob", email="bob@test.com")
+        )
+        await TransferCrud.create(
+            db_session,
+            TransferCreate(amount="100", sender_id=alice.id, receiver_id=bob.id),
+        )
+
+        Sender = aliased(User)
+        Receiver = aliased(User)
+
+        # bob is receiver, not sender — should return nothing
+        results = await TransferCrud.get_multi(
+            db_session,
+            joins=[
+                (Sender, Transfer.sender_id == Sender.id),
+                (Receiver, Transfer.receiver_id == Receiver.id),
+            ],
+            filters=[Sender.username == "bob", Receiver.username == "alice"],
+        )
+        assert len(results) == 0
+
+    @pytest.mark.anyio
+    async def test_paginate_with_aliased_joins(self, db_session: AsyncSession):
+        """Aliased joins work with offset_paginate."""
+        from sqlalchemy.orm import aliased
+
+        alice = await UserCrud.create(
+            db_session, UserCreate(username="alice", email="alice@test.com")
+        )
+        bob = await UserCrud.create(
+            db_session, UserCreate(username="bob", email="bob@test.com")
+        )
+        await TransferCrud.create(
+            db_session,
+            TransferCreate(amount="50", sender_id=alice.id, receiver_id=bob.id),
+        )
+        await TransferCrud.create(
+            db_session,
+            TransferCreate(amount="75", sender_id=bob.id, receiver_id=alice.id),
+        )
+
+        Sender = aliased(User)
+        result = await TransferCrud.offset_paginate(
+            db_session,
+            joins=[(Sender, Transfer.sender_id == Sender.id)],
+            filters=[Sender.username == "alice"],
+            schema=TransferRead,
+        )
+        assert result.pagination.total_count == 1
+        assert result.data[0].amount == "50"
+
+    @pytest.mark.anyio
+    async def test_count_with_aliased_join(self, db_session: AsyncSession):
+        """Aliased joins work with count."""
+        from sqlalchemy.orm import aliased
+
+        alice = await UserCrud.create(
+            db_session, UserCreate(username="alice", email="alice@test.com")
+        )
+        bob = await UserCrud.create(
+            db_session, UserCreate(username="bob", email="bob@test.com")
+        )
+        await TransferCrud.create(
+            db_session,
+            TransferCreate(amount="10", sender_id=alice.id, receiver_id=bob.id),
+        )
+        await TransferCrud.create(
+            db_session,
+            TransferCreate(amount="20", sender_id=alice.id, receiver_id=bob.id),
+        )
+
+        Sender = aliased(User)
+        count = await TransferCrud.count(
+            db_session,
+            joins=[(Sender, Transfer.sender_id == Sender.id)],
+            filters=[Sender.username == "alice"],
+        )
+        assert count == 2
+
+
 class TestCrudFactoryM2M:
     """Tests for CrudFactory with m2m_fields parameter."""
 
@@ -1759,6 +2160,52 @@ class TestSchemaResponse:
         assert result.data[0].username == "pg_user"
         assert not hasattr(result.data[0], "email")
 
+    @pytest.mark.anyio
+    async def test_include_total_false_skips_count(self, db_session: AsyncSession):
+        """offset_paginate with include_total=False returns total_count=None."""
+        from fastapi_toolsets.schemas import OffsetPagination
+
+        for i in range(5):
+            await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
+
+        result = await RoleCrud.offset_paginate(
+            db_session, items_per_page=10, include_total=False, schema=RoleRead
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count is None
+        assert len(result.data) == 5
+        assert result.pagination.has_more is False
+
+    @pytest.mark.anyio
+    async def test_include_total_false_has_more_true(self, db_session: AsyncSession):
+        """offset_paginate with include_total=False sets has_more via extra-row probe."""
+        for i in range(15):
+            await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
+
+        result = await RoleCrud.offset_paginate(
+            db_session, items_per_page=10, include_total=False, schema=RoleRead
+        )
+
+        assert result.pagination.total_count is None
+        assert result.pagination.has_more is True
+        assert len(result.data) == 10
+
+    @pytest.mark.anyio
+    async def test_include_total_false_exact_page_boundary(
+        self, db_session: AsyncSession
+    ):
+        """offset_paginate with include_total=False: has_more=False when items == page size."""
+        for i in range(10):
+            await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
+
+        result = await RoleCrud.offset_paginate(
+            db_session, items_per_page=10, include_total=False, schema=RoleRead
+        )
+
+        assert result.pagination.has_more is False
+        assert len(result.data) == 10
+
 
 class TestCursorPaginate:
     """Tests for cursor-based pagination via cursor_paginate()."""
@@ -2315,7 +2762,7 @@ class TestCursorPaginateSearchJoins:
 
 
 class TestGetWithForUpdate:
-    """Tests for get() with with_for_update=True."""
+    """Tests for get/get_or_none with_for_update variants."""
 
     @pytest.mark.anyio
     async def test_get_with_for_update(self, db_session: AsyncSession):
@@ -2331,6 +2778,105 @@ class TestGetWithForUpdate:
         assert result.id == role.id
         assert result.name == "locked"
 
+    @pytest.mark.anyio
+    async def test_get_with_for_update_nowait(self, db_session: AsyncSession):
+        """get() with with_for_update='nowait' emits FOR UPDATE NOWAIT."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="nowait"))
+
+        result = await RoleCrud.get(
+            db_session,
+            filters=[Role.id == role.id],
+            with_for_update="nowait",
+        )
+
+        assert result.id == role.id
+
+    @pytest.mark.anyio
+    async def test_get_with_for_update_skip_locked(self, db_session: AsyncSession):
+        """get() with with_for_update='skip_locked' emits FOR UPDATE SKIP LOCKED."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="skip"))
+
+        result = await RoleCrud.get(
+            db_session,
+            filters=[Role.id == role.id],
+            with_for_update="skip_locked",
+        )
+
+        assert result.id == role.id
+
+    @pytest.mark.anyio
+    async def test_get_or_none_with_for_update(self, db_session: AsyncSession):
+        """get_or_none() with with_for_update=True locks the row."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="locked2"))
+
+        result = await RoleCrud.get_or_none(
+            db_session,
+            [Role.id == role.id],
+            with_for_update=True,
+        )
+
+        assert result is not None
+        assert result.id == role.id
+
+    @pytest.mark.anyio
+    async def test_get_or_none_with_for_update_nowait(self, db_session: AsyncSession):
+        """get_or_none() with with_for_update='nowait' emits FOR UPDATE NOWAIT."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="nowait2"))
+
+        result = await RoleCrud.get_or_none(
+            db_session,
+            [Role.id == role.id],
+            with_for_update="nowait",
+        )
+
+        assert result is not None
+        assert result.id == role.id
+
+    @pytest.mark.anyio
+    async def test_get_or_none_with_for_update_skip_locked(
+        self, db_session: AsyncSession
+    ):
+        """get_or_none() with with_for_update='skip_locked' emits FOR UPDATE SKIP LOCKED."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="skip2"))
+
+        result = await RoleCrud.get_or_none(
+            db_session,
+            [Role.id == role.id],
+            with_for_update="skip_locked",
+        )
+
+        assert result is not None
+        assert result.id == role.id
+
+    def test_for_update_sql_clauses(self):
+        """Verify _apply_for_update emits the correct SQL FOR UPDATE clauses."""
+        from sqlalchemy import select
+        from sqlalchemy.dialects import postgresql
+
+        from fastapi_toolsets.crud.factory import _apply_for_update
+
+        base = select(Role)
+
+        plain = str(_apply_for_update(base, True).compile(dialect=postgresql.dialect()))
+        assert "FOR UPDATE" in plain
+        assert "NOWAIT" not in plain
+        assert "SKIP LOCKED" not in plain
+
+        nowait = str(
+            _apply_for_update(base, "nowait").compile(dialect=postgresql.dialect())
+        )
+        assert "FOR UPDATE NOWAIT" in nowait
+
+        skip = str(
+            _apply_for_update(base, "skip_locked").compile(dialect=postgresql.dialect())
+        )
+        assert "FOR UPDATE SKIP LOCKED" in skip
+
+        no_lock = str(
+            _apply_for_update(base, False).compile(dialect=postgresql.dialect())
+        )
+        assert "FOR UPDATE" not in no_lock
+
 
 class TestCursorPaginateColumnTypes:
     """Tests for cursor_paginate() covering DateTime, Date and Numeric column types."""
@@ -2520,4 +3066,21 @@ class TestPaginate:
                 db_session,
                 pagination_type="unknown",
                 schema=RoleRead,
-            )  # type: ignore[no-matching-overload]
+            )  # type: ignore[no-matching-overload]  # ty:ignore[no-matching-overload]
+
+    @pytest.mark.anyio
+    async def test_offset_include_total_false(self, db_session: AsyncSession):
+        """paginate() passes include_total=False through to offset_paginate."""
+        from fastapi_toolsets.schemas import OffsetPagination
+
+        await RoleCrud.create(db_session, RoleCreate(name="admin"))
+
+        result = await RoleCrud.paginate(
+            db_session,
+            pagination_type=PaginationType.OFFSET,
+            include_total=False,
+            schema=RoleRead,
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count is None

tests/test_dependencies.py

@@ -20,7 +20,7 @@ from .conftest import Role, RoleCreate, RoleCrud, User
 
 async def mock_get_db() -> AsyncGenerator[AsyncSession, None]:
     """Mock session dependency for testing."""
-    yield None
+    yield None  # type: ignore[misc]  # ty:ignore[invalid-yield]
 
 
 MockSessionDep = Annotated[AsyncSession, Depends(mock_get_db)]

tests/test_example_pagination_search.py

@@ -10,12 +10,13 @@ import datetime
 import pytest
 from fastapi import FastAPI
 from httpx import ASGITransport, AsyncClient
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.ext.asyncio import AsyncSession
 
 from docs_src.examples.pagination_search.db import get_db
 from docs_src.examples.pagination_search.models import Article, Base, Category
 from docs_src.examples.pagination_search.routes import router
 from fastapi_toolsets.exceptions import init_exceptions_handlers
+from fastapi_toolsets.pytest import create_db_session
 
 from .conftest import DATABASE_URL
 
@@ -35,20 +36,8 @@ def build_app(session: AsyncSession) -> FastAPI:
 @pytest.fixture(scope="function")
 async def ex_db_session():
     """Isolated session for the example models (separate tables from conftest)."""
-    engine = create_async_engine(DATABASE_URL, echo=False)
-    async with engine.begin() as conn:
-        await conn.run_sync(Base.metadata.create_all)
-
-    session_factory = async_sessionmaker(engine, expire_on_commit=False)
-    session = session_factory()
-
-    try:
+    async with create_db_session(DATABASE_URL, Base) as session:
         yield session
-    finally:
-        await session.close()
-        async with engine.begin() as conn:
-            await conn.run_sync(Base.metadata.drop_all)
-        await engine.dispose()
 
 
 @pytest.fixture
@@ -67,7 +56,7 @@ async def seed(session: AsyncSession):
     session.add_all([python, backend])
     await session.flush()
 
-    now = datetime.datetime(2024, 1, 1, tzinfo=datetime.timezone.utc)
+    now = datetime.datetime(2024, 1, 1, tzinfo=datetime.UTC)
     session.add_all(
         [
             Article(
@@ -102,13 +91,19 @@ async def seed(session: AsyncSession):
 class TestAppSessionDep:
     @pytest.mark.anyio
     async def test_get_db_yields_async_session(self):
-        """get_db yields a real AsyncSession when called directly."""
-        from docs_src.examples.pagination_search.db import get_db
+        """The Database dependency yields a real AsyncSession when called directly."""
+        from starlette.requests import Request
 
-        gen = get_db()
-        session = await gen.__anext__()
-        assert isinstance(session, AsyncSession)
-        await session.close()
+        from fastapi_toolsets.db import Database
+
+        db = Database(DATABASE_URL)
+        try:
+            gen = db(Request({"type": "http", "headers": []}))
+            session = await gen.__anext__()
+            assert isinstance(session, AsyncSession)
+            await gen.aclose()
+        finally:
+            await db.engine.dispose()
 
 
 class TestOffsetPagination:
@@ -193,8 +188,7 @@ class TestOffsetPagination:
         body = resp.json()
         fa = body["filter_attributes"]
         assert set(fa["status"]) == {"draft", "published"}
-        # "name" is unique across all facet fields — no prefix needed
-        assert set(fa["name"]) == {"backend", "python"}
+        assert set(fa["category__name"]) == {"backend", "python"}
 
     @pytest.mark.anyio
     async def test_filter_attributes_scoped_to_filter(
@@ -205,8 +199,9 @@ class TestOffsetPagination:
         resp = await client.get("/articles/offset?status=published")
 
         body = resp.json()
-        # draft is filtered out → should not appear in filter_attributes
-        assert "draft" not in body["filter_attributes"]["status"]
+        # a facet excludes its own filter_by condition, so filtering by
+        # status=published still shows every status the facet offers
+        assert "draft" in body["filter_attributes"]["status"]
 
     @pytest.mark.anyio
     async def test_search_and_filter_combined(self, client: AsyncClient, ex_db_session):

tests/test_exceptions.py

@@ -10,7 +10,9 @@ from fastapi_toolsets.exceptions import (
     ConflictError,
     ForbiddenError,
     InvalidOrderFieldError,
+    LockTimeoutError,
     NotFoundError,
+    PoolExhaustedError,
     UnauthorizedError,
     generate_error_responses,
     init_exceptions_handlers,
@@ -216,6 +218,72 @@ class TestApiExceptionGuard:
         assert err.api_error.code == 404
 
 
+class TestDbExceptions:
+    """Tests for database-related exception classes."""
+
+    def test_pool_exhausted_error_attributes(self):
+        """PoolExhaustedError has 503 status and DB-503-POOL error code."""
+        error = PoolExhaustedError()
+        assert error.api_error.code == 503
+        assert error.api_error.err_code == "DB-503-POOL"
+        assert error.api_error.msg == "Service Unavailable"
+
+    def test_pool_exhausted_error_with_detail(self):
+        """PoolExhaustedError accepts a detail string that overrides msg."""
+        error = PoolExhaustedError("pool full")
+        assert error.api_error.msg == "pool full"
+        assert PoolExhaustedError.api_error.msg == "Service Unavailable"
+
+    def test_lock_timeout_error_attributes(self):
+        """LockTimeoutError has 503 status and DB-503-LOCK error code."""
+        error = LockTimeoutError()
+        assert error.api_error.code == 503
+        assert error.api_error.err_code == "DB-503-LOCK"
+        assert error.api_error.msg == "Service Unavailable"
+
+    def test_lock_timeout_error_with_detail(self):
+        """LockTimeoutError accepts a detail string that overrides msg."""
+        error = LockTimeoutError("contended")
+        assert error.api_error.msg == "contended"
+        assert LockTimeoutError.api_error.msg == "Service Unavailable"
+
+    def test_pool_exhausted_handled_as_503(self):
+        """init_exceptions_handlers turns PoolExhaustedError into a 503 response."""
+        from fastapi import FastAPI
+
+        from fastapi_toolsets.exceptions import init_exceptions_handlers
+
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/db")
+        async def endpoint():
+            raise PoolExhaustedError()
+
+        client = TestClient(app)
+        response = client.get("/db")
+        assert response.status_code == 503
+        assert response.json()["error_code"] == "DB-503-POOL"
+
+    def test_lock_timeout_handled_as_503(self):
+        """init_exceptions_handlers turns LockTimeoutError into a 503 response."""
+        from fastapi import FastAPI
+
+        from fastapi_toolsets.exceptions import init_exceptions_handlers
+
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/lock")
+        async def endpoint():
+            raise LockTimeoutError()
+
+        client = TestClient(app)
+        response = client.get("/lock")
+        assert response.status_code == 503
+        assert response.json()["error_code"] == "DB-503-LOCK"
+
+
 class TestBuiltInExceptions:
     """Tests for built-in exception classes."""
 

tests/test_imports.py

@@ -101,7 +101,7 @@ class TestMetricsImportGuard:
             with patch("builtins.__import__", side_effect=blocking_import):
                 mod = importlib.import_module("fastapi_toolsets.metrics")
                 with pytest.raises(ImportError, match="prometheus_client"):
-                    mod.init_metrics(None, None)  # type: ignore[arg-type]
+                    mod.init_metrics(None, None)  # type: ignore[arg-type]  # ty:ignore[invalid-argument-type]
         finally:
             for key in list(sys.modules):
                 if key.startswith("fastapi_toolsets.metrics"):
@@ -171,8 +171,15 @@ class TestPytestImportGuard:
 class TestCliImportGuard:
     """Tests for CLI module import guard when typer is missing."""
 
-    def test_import_raises_without_typer(self):
-        """Importing cli.app raises when typer is missing."""
+    @pytest.mark.parametrize(
+        "expected_match",
+        [
+            "typer",
+            r"pip install fastapi-toolsets\[cli\]",
+        ],
+    )
+    def test_import_raises_without_typer(self, expected_match):
+        """Importing cli.app raises when typer is missing, with an informative error message."""
         saved, blocking_import = _reload_without_package(
             "fastapi_toolsets.cli.app", ["typer"]
         )
@@ -186,38 +193,12 @@ class TestCliImportGuard:
 
         try:
             with patch("builtins.__import__", side_effect=blocking_import):
-                with pytest.raises(ImportError, match="typer"):
+                with pytest.raises(ImportError, match=expected_match):
                     importlib.import_module("fastapi_toolsets.cli.app")
         finally:
             for key in list(sys.modules):
-                if key.startswith("fastapi_toolsets.cli.app") or key.startswith(
-                    "fastapi_toolsets.cli.config"
-                ):
-                    sys.modules.pop(key, None)
-            sys.modules.update(saved)
-
-    def test_error_message_suggests_cli_extra(self):
-        """Error message suggests installing the cli extra."""
-        saved, blocking_import = _reload_without_package(
-            "fastapi_toolsets.cli.app", ["typer"]
-        )
-        config_keys = [
-            k for k in sys.modules if k.startswith("fastapi_toolsets.cli.config")
-        ]
-        for key in config_keys:
-            if key not in saved:
-                saved[key] = sys.modules.pop(key)
-
-        try:
-            with patch("builtins.__import__", side_effect=blocking_import):
-                with pytest.raises(
-                    ImportError, match=r"pip install fastapi-toolsets\[cli\]"
-                ):
-                    importlib.import_module("fastapi_toolsets.cli.app")
-        finally:
-            for key in list(sys.modules):
-                if key.startswith("fastapi_toolsets.cli.app") or key.startswith(
-                    "fastapi_toolsets.cli.config"
+                if key.startswith(
+                    ("fastapi_toolsets.cli.app", "fastapi_toolsets.cli.config")
                 ):
                     sys.modules.pop(key, None)
             sys.modules.update(saved)

tests/test_metrics.py

@@ -1,6 +1,5 @@
 """Tests for fastapi_toolsets.metrics module."""
 
-import os
 import tempfile
 from unittest.mock import AsyncMock, MagicMock
 
@@ -287,6 +286,16 @@ class TestIncludeRegistry:
 class TestInitMetrics:
     """Tests for init_metrics function."""
 
+    @pytest.fixture
+    def metrics_client(self):
+        """Create a FastAPI app with MetricsRegistry and return a TestClient."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry)
+        client = TestClient(app)
+        yield client
+        client.close()
+
     def test_returns_app(self):
         """Returns the FastAPI app."""
         app = FastAPI()
@@ -294,26 +303,14 @@ class TestInitMetrics:
         result = init_metrics(app, registry)
         assert result is app
 
-    def test_metrics_endpoint_responds(self):
+    def test_metrics_endpoint_responds(self, metrics_client):
         """The /metrics endpoint returns 200."""
-        app = FastAPI()
-        registry = MetricsRegistry()
-        init_metrics(app, registry)
-
-        client = TestClient(app)
-        response = client.get("/metrics")
-
+        response = metrics_client.get("/metrics")
         assert response.status_code == 200
 
-    def test_metrics_endpoint_content_type(self):
+    def test_metrics_endpoint_content_type(self, metrics_client):
         """The /metrics endpoint returns prometheus content type."""
-        app = FastAPI()
-        registry = MetricsRegistry()
-        init_metrics(app, registry)
-
-        client = TestClient(app)
-        response = client.get("/metrics")
-
+        response = metrics_client.get("/metrics")
         assert "text/plain" in response.headers["content-type"]
 
     def test_custom_path(self):
@@ -445,36 +442,33 @@ class TestInitMetrics:
 class TestMultiProcessMode:
     """Tests for multi-process Prometheus mode."""
 
-    def test_multiprocess_with_env_var(self):
+    def test_multiprocess_with_env_var(self, monkeypatch):
         """Multi-process mode works when PROMETHEUS_MULTIPROC_DIR is set."""
         with tempfile.TemporaryDirectory() as tmpdir:
-            os.environ["PROMETHEUS_MULTIPROC_DIR"] = tmpdir
-            try:
-                # Use a separate registry to avoid conflicts with default
-                prom_registry = CollectorRegistry()
-                app = FastAPI()
-                registry = MetricsRegistry()
+            monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", tmpdir)
+            # Use a separate registry to avoid conflicts with default
+            prom_registry = CollectorRegistry()
+            app = FastAPI()
+            registry = MetricsRegistry()
 
-                @registry.register
-                def mp_counter():
-                    return Counter(
-                        "mp_test_counter",
-                        "A multiprocess counter",
-                        registry=prom_registry,
-                    )
+            @registry.register
+            def mp_counter():
+                return Counter(
+                    "mp_test_counter",
+                    "A multiprocess counter",
+                    registry=prom_registry,
+                )
 
-                init_metrics(app, registry)
+            init_metrics(app, registry)
 
-                client = TestClient(app)
-                response = client.get("/metrics")
+            client = TestClient(app)
+            response = client.get("/metrics")
 
-                assert response.status_code == 200
-            finally:
-                del os.environ["PROMETHEUS_MULTIPROC_DIR"]
+            assert response.status_code == 200
 
-    def test_single_process_without_env_var(self):
+    def test_single_process_without_env_var(self, monkeypatch):
         """Single-process mode when PROMETHEUS_MULTIPROC_DIR is not set."""
-        os.environ.pop("PROMETHEUS_MULTIPROC_DIR", None)
+        monkeypatch.delenv("PROMETHEUS_MULTIPROC_DIR", raising=False)
 
         app = FastAPI()
         registry = MetricsRegistry()

tests/test_pytest.py

@@ -1,16 +1,23 @@
 """Tests for fastapi_toolsets.pytest module."""
 
 import uuid
+from typing import cast
 
 import pytest
 from fastapi import Depends, FastAPI
 from httpx import AsyncClient
-from sqlalchemy import select, text
+from sqlalchemy import ForeignKey, String, select, text
 from sqlalchemy.engine import make_url
-from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
-from sqlalchemy.orm import selectinload
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
-from fastapi_toolsets.fixtures import Context, FixtureRegistry
+from fastapi_toolsets.db import transaction
+from fastapi_toolsets.fixtures import Context, FixtureRegistry, LoadStrategy
+from fastapi_toolsets.fixtures.utils import (
+    _get_primary_key,
+    _relationship_load_options,
+    _reload_with_relationships,
+)
 from fastapi_toolsets.pytest import (
     create_async_client,
     create_db_session,
@@ -20,7 +27,16 @@ from fastapi_toolsets.pytest import (
 )
 from fastapi_toolsets.pytest.utils import _get_xdist_worker
 
-from .conftest import DATABASE_URL, Base, Role, RoleCrud, User, UserCrud
+from .conftest import (
+    DATABASE_URL,
+    Base,
+    IntRole,
+    Permission,
+    Role,
+    RoleCrud,
+    User,
+    UserCrud,
+)
 
 test_registry = FixtureRegistry()
 
@@ -135,14 +151,8 @@ class TestGeneratedFixtures:
     async def test_fixture_relationships_work(
         self, db_session: AsyncSession, fixture_users: list[User]
     ):
-        """Loaded fixtures have working relationships."""
-        # Load user with role relationship
-        user = await UserCrud.get(
-            db_session,
-            [User.id == USER_ADMIN_ID],
-            load_options=[selectinload(User.role)],
-        )
-
+        """Loaded fixtures have working relationships directly accessible."""
+        user = next(u for u in fixture_users if u.id == USER_ADMIN_ID)
         assert user.role is not None
         assert user.role.name == "plugin_admin"
 
@@ -176,6 +186,15 @@ class TestGeneratedFixtures:
         assert users[0].username == "plugin_admin"
         assert users[1].username == "plugin_user"
 
+    @pytest.mark.anyio
+    async def test_fixture_auto_loads_relationships(
+        self, db_session: AsyncSession, fixture_users: list[User]
+    ):
+        """Fixtures automatically eager-load all direct relationships."""
+        user = next(u for u in fixture_users if u.username == "plugin_admin")
+        assert user.role is not None
+        assert user.role.name == "plugin_admin"
+
     @pytest.mark.anyio
     async def test_multiple_fixtures_in_same_test(
         self,
@@ -259,6 +278,21 @@ class TestCreateAsyncClient:
         # Overrides should be cleaned up
         assert original_dep not in app.dependency_overrides
 
+    @pytest.mark.anyio
+    async def test_kwargs_forwarded_to_async_client(self):
+        """Extra kwargs are forwarded to AsyncClient (e.g. default headers)."""
+        from fastapi import Request
+
+        app = FastAPI()
+
+        @app.get("/headers")
+        async def headers_endpoint(request: Request):
+            return {"x-custom": request.headers.get("x-custom")}
+
+        async with create_async_client(app, headers={"X-Custom": "sentinel"}) as client:
+            response = await client.get("/headers")
+            assert response.json() == {"x-custom": "sentinel"}
+
 
 class TestCreateDbSession:
     """Tests for create_db_session helper."""
@@ -336,6 +370,58 @@ class TestCreateDbSession:
             result = await session.execute(select(Role))
             assert result.all() == []
 
+    @pytest.mark.anyio
+    async def test_engine_kwargs_forwarded(self):
+        """engine_kwargs are forwarded to create_async_engine."""
+        async with create_db_session(
+            DATABASE_URL, Base, engine_kwargs={"pool_pre_ping": True}
+        ) as session:
+            assert isinstance(session, AsyncSession)
+
+    @pytest.mark.anyio
+    async def test_session_kwargs_forwarded(self):
+        """session_kwargs are forwarded to async_sessionmaker."""
+        async with create_db_session(
+            DATABASE_URL, Base, session_kwargs={"autoflush": False}
+        ) as session:
+            assert session.autoflush is False
+
+    @pytest.mark.anyio
+    async def test_transaction_commits_visible_to_separate_session(self):
+        """Data written via transaction() is committed and visible to other sessions."""
+        role_id = uuid.uuid4()
+
+        async with create_db_session(DATABASE_URL, Base, drop_tables=False) as session:
+            # Simulate what _create_fixture_function does: insert via transaction()
+            # with no explicit commit afterward.
+            async with transaction(session):
+                role = Role(id=role_id, name="visible_to_other_session")
+                session.add(role)
+
+            # The data must have been committed (begin/commit, not a savepoint),
+            # so a separate engine/session can read it.
+            other_engine = create_async_engine(DATABASE_URL, echo=False)
+            try:
+                other_session_maker = async_sessionmaker(
+                    other_engine, expire_on_commit=False
+                )
+                async with other_session_maker() as other:
+                    result = await other.execute(select(Role).where(Role.id == role_id))
+                    fetched = result.scalar_one_or_none()
+                    assert fetched is not None, (
+                        "Fixture data inserted via transaction() must be committed "
+                        "and visible to a separate session. If create_db_session uses "
+                        "db.session(), auto-begin forces transaction() into "
+                        "savepoints instead of real commits."
+                    )
+                    assert fetched.name == "visible_to_other_session"
+            finally:
+                await other_engine.dispose()
+
+        # Cleanup
+        async with create_db_session(DATABASE_URL, Base, drop_tables=True) as _:
+            pass
+
 
 class TestGetXdistWorker:
     """Tests for _get_xdist_worker helper."""
@@ -356,21 +442,19 @@ class TestGetXdistWorker:
 class TestWorkerDatabaseUrl:
     """Tests for worker_database_url helper."""
 
-    def test_appends_default_test_db_without_xdist(
-        self, monkeypatch: pytest.MonkeyPatch
-    ):
-        """default_test_db is appended when not running under xdist."""
+    def test_uses_default_test_db_without_xdist(self, monkeypatch: pytest.MonkeyPatch):
+        """default_test_db is used as the database name when not running under xdist."""
         monkeypatch.delenv("PYTEST_XDIST_WORKER", raising=False)
         url = "postgresql+asyncpg://user:pass@localhost:5432/mydb"
         result = worker_database_url(url, default_test_db="fallback")
-        assert make_url(result).database == "mydb_fallback"
+        assert make_url(result).database == "fallback"
 
-    def test_appends_worker_id_to_database_name(self, monkeypatch: pytest.MonkeyPatch):
-        """Worker name is appended to the database name."""
+    def test_uses_worker_id_as_database_name(self, monkeypatch: pytest.MonkeyPatch):
+        """Worker name is used as the database name."""
         monkeypatch.setenv("PYTEST_XDIST_WORKER", "gw0")
         url = "postgresql+asyncpg://user:pass@localhost:5432/db"
         result = worker_database_url(url, default_test_db="unused")
-        assert make_url(result).database == "db_gw0"
+        assert make_url(result).database == "gw0"
 
     def test_preserves_url_components(self, monkeypatch: pytest.MonkeyPatch):
         """Host, port, username, password, and driver are preserved."""
@@ -383,7 +467,21 @@ class TestWorkerDatabaseUrl:
         assert result.password == "secret"
         assert result.host == "dbhost"
         assert result.port == 6543
-        assert result.database == "testdb_gw2"
+        assert result.database == "gw2"
+
+    def test_prefix_with_xdist(self, monkeypatch: pytest.MonkeyPatch):
+        """prefix is prepended to the worker name when running under xdist."""
+        monkeypatch.setenv("PYTEST_XDIST_WORKER", "gw0")
+        url = "postgresql+asyncpg://user:pass@localhost:5432/mydb"
+        result = worker_database_url(url, default_test_db="unused", prefix="myapp")
+        assert make_url(result).database == "myapp_gw0"
+
+    def test_prefix_without_xdist(self, monkeypatch: pytest.MonkeyPatch):
+        """prefix is prepended to default_test_db when not running under xdist."""
+        monkeypatch.delenv("PYTEST_XDIST_WORKER", raising=False)
+        url = "postgresql+asyncpg://user:pass@localhost:5432/mydb"
+        result = worker_database_url(url, default_test_db="test", prefix="myapp")
+        assert make_url(result).database == "myapp_test"
 
 
 class TestCreateWorkerDatabase:
@@ -393,7 +491,7 @@ class TestCreateWorkerDatabase:
     async def test_creates_default_db_without_xdist(
         self, monkeypatch: pytest.MonkeyPatch
     ):
-        """Without xdist, creates a database suffixed with default_test_db."""
+        """Without xdist, creates a database named after default_test_db."""
         monkeypatch.delenv("PYTEST_XDIST_WORKER", raising=False)
         default_test_db = "no_xdist_default"
         expected_db = make_url(
@@ -479,3 +577,311 @@ class TestCreateWorkerDatabase:
             )
             assert result.scalar() is None
         await engine.dispose()
+
+    @pytest.mark.anyio
+    async def test_works_when_database_url_db_does_not_exist(
+        self, monkeypatch: pytest.MonkeyPatch
+    ):
+        """Succeeds even when the database named in database_url does not exist.
+
+        Regression test: the old code connected the DDL engine to database_url
+        itself, which failed when that database had not been created yet.
+        """
+        monkeypatch.setenv("PYTEST_XDIST_WORKER", "gw_noexist")
+        nonexistent_url = (
+            make_url(DATABASE_URL)
+            .set(database="no_such_db")
+            .render_as_string(hide_password=False)
+        )
+        expected_db = make_url(
+            worker_database_url(nonexistent_url, default_test_db="unused")
+        ).database
+
+        async with create_worker_database(nonexistent_url) as url:
+            assert make_url(url).database == expected_db
+
+            engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
+            async with engine.connect() as conn:
+                result = await conn.execute(
+                    text("SELECT 1 FROM pg_database WHERE datname = :name"),
+                    {"name": expected_db},
+                )
+                assert result.scalar() == 1
+            await engine.dispose()
+
+        engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
+        async with engine.connect() as conn:
+            result = await conn.execute(
+                text("SELECT 1 FROM pg_database WHERE datname = :name"),
+                {"name": expected_db},
+            )
+            assert result.scalar() is None
+        await engine.dispose()
+
+    @pytest.mark.anyio
+    async def test_explicit_server_url(self, monkeypatch: pytest.MonkeyPatch):
+        """Explicit server_url is used instead of the auto-derived one."""
+        monkeypatch.setenv("PYTEST_XDIST_WORKER", "gw_explicit_srv")
+        expected_db = make_url(
+            worker_database_url(DATABASE_URL, default_test_db="unused")
+        ).database
+
+        async with create_worker_database(DATABASE_URL, server_url=DATABASE_URL) as url:
+            assert make_url(url).database == expected_db
+
+            engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
+            async with engine.connect() as conn:
+                result = await conn.execute(
+                    text("SELECT 1 FROM pg_database WHERE datname = :name"),
+                    {"name": expected_db},
+                )
+                assert result.scalar() == 1
+            await engine.dispose()
+
+    @pytest.mark.anyio
+    async def test_drops_database_with_active_connections(
+        self, monkeypatch: pytest.MonkeyPatch
+    ):
+        """DROP DATABASE succeeds even when a connection is still open to it."""
+        monkeypatch.setenv("PYTEST_XDIST_WORKER", "gw_active_conn")
+        expected_db = make_url(
+            worker_database_url(DATABASE_URL, default_test_db="unused")
+        ).database
+
+        lingering_engine = None
+        async with create_worker_database(DATABASE_URL) as url:
+            # Open a connection to the worker DB and intentionally leave it open.
+            lingering_engine = create_async_engine(url)
+            async with lingering_engine.connect():
+                pass  # connection returned to pool but engine not disposed
+
+        # If WITH (FORCE) is absent the DROP above would raise; reaching here means it worked.
+        engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
+        async with engine.connect() as conn:
+            result = await conn.execute(
+                text("SELECT 1 FROM pg_database WHERE datname = :name"),
+                {"name": expected_db},
+            )
+            assert result.scalar() is None
+        await engine.dispose()
+        if lingering_engine:
+            await lingering_engine.dispose()
+
+    @pytest.mark.anyio
+    async def test_prefix_names_database(self, monkeypatch: pytest.MonkeyPatch):
+        """prefix is prepended to the worker name in the created database."""
+        monkeypatch.setenv("PYTEST_XDIST_WORKER", "gw_prefix")
+        expected_db = make_url(
+            worker_database_url(DATABASE_URL, default_test_db="unused", prefix="pfx")
+        ).database
+        assert expected_db == "pfx_gw_prefix"
+
+        async with create_worker_database(DATABASE_URL, prefix="pfx") as url:
+            assert make_url(url).database == expected_db
+
+            engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
+            async with engine.connect() as conn:
+                result = await conn.execute(
+                    text("SELECT 1 FROM pg_database WHERE datname = :name"),
+                    {"name": expected_db},
+                )
+                assert result.scalar() == 1
+            await engine.dispose()
+
+        engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
+        async with engine.connect() as conn:
+            result = await conn.execute(
+                text("SELECT 1 FROM pg_database WHERE datname = :name"),
+                {"name": expected_db},
+            )
+            assert result.scalar() is None
+        await engine.dispose()
+
+
+class _LocalBase(DeclarativeBase):
+    pass
+
+
+class _Group(_LocalBase):
+    __tablename__ = "_test_groups"
+    id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
+    name: Mapped[str] = mapped_column(String(50))
+
+
+class _CompositeItem(_LocalBase):
+    """Model with composite PK and a relationship — exercises the fallback path."""
+
+    __tablename__ = "_test_composite_items"
+    group_id: Mapped[uuid.UUID] = mapped_column(
+        ForeignKey("_test_groups.id"), primary_key=True
+    )
+    item_code: Mapped[str] = mapped_column(String(50), primary_key=True)
+    group: Mapped["_Group"] = relationship()
+
+
+class TestGetPrimaryKey:
+    """Unit tests for _get_primary_key — no DB needed."""
+
+    def test_single_pk_returns_value(self):
+        rid = uuid.UUID("00000000-0000-0000-0000-000000000001")
+        role = Role(id=rid, name="x")
+        assert _get_primary_key(role) == rid
+
+    def test_composite_pk_all_set_returns_tuple(self):
+        perm = Permission(subject="posts", action="read")
+        assert _get_primary_key(perm) == ("posts", "read")
+
+    def test_composite_pk_partial_none_returns_none(self):
+        perm = Permission(subject=None, action="read")
+        assert _get_primary_key(perm) is None
+
+    def test_composite_pk_all_none_returns_none(self):
+        perm = Permission(subject=None, action=None)
+        assert _get_primary_key(perm) is None
+
+
+class TestRelationshipLoadOptions:
+    """Unit tests for _relationship_load_options — no DB needed."""
+
+    def test_empty_for_model_with_no_relationships(self):
+        assert _relationship_load_options(IntRole) == []
+
+    def test_returns_options_for_model_with_relationships(self):
+        opts = _relationship_load_options(User)
+        assert len(opts) >= 1
+
+
+class TestFixtureStrategies:
+    """Integration tests covering INSERT, SKIP_EXISTING, empty fixture, no-rels model."""
+
+    @pytest.mark.anyio
+    async def test_empty_fixture_returns_empty_list(self, db_session: AsyncSession):
+        """Fixture function returning [] produces an empty list."""
+        registry = FixtureRegistry()
+
+        @registry.register()
+        def empty() -> list[Role]:
+            return []
+
+        local_ns: dict = {}
+        register_fixtures(registry, local_ns, session_fixture="db_session")
+        inner = local_ns["fixture_empty"].__wrapped__  # type: ignore[attr-defined]
+        result = await inner(db_session=db_session)
+        assert result == []
+
+    @pytest.mark.anyio
+    async def test_insert_strategy_no_relationships(self, db_session: AsyncSession):
+        """INSERT strategy adds instances; model with no rels skips reload (line 135)."""
+        registry = FixtureRegistry()
+
+        @registry.register()
+        def int_roles() -> list[IntRole]:
+            return [IntRole(name="insert_role")]
+
+        local_ns: dict = {}
+        register_fixtures(
+            registry,
+            local_ns,
+            session_fixture="db_session",
+            strategy=LoadStrategy.INSERT,
+        )
+        inner = local_ns["fixture_int_roles"].__wrapped__  # type: ignore[attr-defined]
+        result = await inner(db_session=db_session)
+        assert len(result) == 1
+        assert result[0].name == "insert_role"
+
+    @pytest.mark.anyio
+    async def test_skip_existing_inserts_new_record(self, db_session: AsyncSession):
+        """SKIP_EXISTING inserts when the record does not yet exist."""
+        registry = FixtureRegistry()
+        role_id = uuid.uuid4()
+
+        @registry.register()
+        def new_roles() -> list[Role]:
+            return [Role(id=role_id, name="skip_new")]
+
+        local_ns: dict = {}
+        register_fixtures(
+            registry,
+            local_ns,
+            session_fixture="db_session",
+            strategy=LoadStrategy.SKIP_EXISTING,
+        )
+        inner = local_ns["fixture_new_roles"].__wrapped__  # type: ignore[attr-defined]
+        result = await inner(db_session=db_session)
+        assert len(result) == 1
+        assert result[0].id == role_id
+
+    @pytest.mark.anyio
+    async def test_skip_existing_returns_existing_record(
+        self, db_session: AsyncSession
+    ):
+        """SKIP_EXISTING returns the existing DB record when PK already present."""
+        role_id = uuid.uuid4()
+        existing = Role(id=role_id, name="already_there")
+        db_session.add(existing)
+        await db_session.flush()
+
+        registry = FixtureRegistry()
+
+        @registry.register()
+        def dup_roles() -> list[Role]:
+            return [Role(id=role_id, name="should_not_overwrite")]
+
+        local_ns: dict = {}
+        register_fixtures(
+            registry,
+            local_ns,
+            session_fixture="db_session",
+            strategy=LoadStrategy.SKIP_EXISTING,
+        )
+        inner = local_ns["fixture_dup_roles"].__wrapped__  # type: ignore[attr-defined]
+        result = await inner(db_session=db_session)
+        assert len(result) == 1
+        assert result[0].name == "already_there"
+
+    @pytest.mark.anyio
+    async def test_skip_existing_null_pk_inserts(self, db_session: AsyncSession):
+        """SKIP_EXISTING with null PK (auto-increment) falls through to session.add()."""
+        registry = FixtureRegistry()
+
+        @registry.register()
+        def auto_roles() -> list[IntRole]:
+            return [IntRole(name="auto_int")]
+
+        local_ns: dict = {}
+        register_fixtures(
+            registry,
+            local_ns,
+            session_fixture="db_session",
+            strategy=LoadStrategy.SKIP_EXISTING,
+        )
+        inner = local_ns["fixture_auto_roles"].__wrapped__  # type: ignore[attr-defined]
+        result = await inner(db_session=db_session)
+        assert len(result) == 1
+        assert result[0].name == "auto_int"
+
+
+class TestReloadWithRelationshipsCompositePK:
+    """Integration test for _reload_with_relationships composite-PK fallback."""
+
+    @pytest.mark.anyio
+    async def test_composite_pk_fallback_loads_relationships(self):
+        """Models with composite PKs are reloaded per-instance via session.get()."""
+        async with create_db_session(DATABASE_URL, _LocalBase) as session:
+            group = _Group(id=uuid.uuid4(), name="g1")
+            session.add(group)
+            await session.flush()
+
+            item = _CompositeItem(group_id=group.id, item_code="A")
+            session.add(item)
+            await session.flush()
+
+            load_opts = _relationship_load_options(_CompositeItem)
+            assert load_opts  # _CompositeItem has 'group' relationship
+
+            reloaded = await _reload_with_relationships(session, [item], load_opts)
+            assert len(reloaded) == 1
+            reloaded_item = cast(_CompositeItem, reloaded[0])
+            assert reloaded_item.group is not None
+            assert reloaded_item.group.name == "g1"

tests/test_schemas.py

@@ -5,11 +5,11 @@ from pydantic import ValidationError
 
 from fastapi_toolsets.schemas import (
     ApiError,
-    CursorPagination,
     CursorPaginatedResponse,
+    CursorPagination,
     ErrorResponse,
-    OffsetPagination,
     OffsetPaginatedResponse,
+    OffsetPagination,
     PaginatedResponse,
     PaginationType,
     Response,
@@ -201,6 +201,88 @@ class TestOffsetPagination:
         assert data["page"] == 2
         assert data["has_more"] is True
 
+    def test_total_count_can_be_none(self):
+        """total_count accepts None (include_total=False mode)."""
+        pagination = OffsetPagination(
+            total_count=None,
+            items_per_page=20,
+            page=1,
+            has_more=True,
+        )
+        assert pagination.total_count is None
+
+    def test_serialization_with_none_total_count(self):
+        """OffsetPagination serializes total_count=None correctly."""
+        pagination = OffsetPagination(
+            total_count=None,
+            items_per_page=20,
+            page=1,
+            has_more=False,
+        )
+        data = pagination.model_dump()
+        assert data["total_count"] is None
+
+    def test_pages_computed(self):
+        """pages is ceil(total_count / items_per_page)."""
+        pagination = OffsetPagination(
+            total_count=42,
+            items_per_page=10,
+            page=1,
+            has_more=True,
+        )
+        assert pagination.pages == 5
+
+    def test_pages_exact_division(self):
+        """pages is exact when total_count is evenly divisible."""
+        pagination = OffsetPagination(
+            total_count=40,
+            items_per_page=10,
+            page=1,
+            has_more=False,
+        )
+        assert pagination.pages == 4
+
+    def test_pages_zero_total(self):
+        """pages is 0 when total_count is 0."""
+        pagination = OffsetPagination(
+            total_count=0,
+            items_per_page=10,
+            page=1,
+            has_more=False,
+        )
+        assert pagination.pages == 0
+
+    def test_pages_zero_items_per_page(self):
+        """pages is 0 when items_per_page is 0."""
+        pagination = OffsetPagination(
+            total_count=100,
+            items_per_page=0,
+            page=1,
+            has_more=False,
+        )
+        assert pagination.pages == 0
+
+    def test_pages_none_when_total_count_none(self):
+        """pages is None when total_count is None (include_total=False)."""
+        pagination = OffsetPagination(
+            total_count=None,
+            items_per_page=20,
+            page=1,
+            has_more=True,
+        )
+        assert pagination.pages is None
+
+    def test_pages_in_serialization(self):
+        """pages appears in model_dump output."""
+        pagination = OffsetPagination(
+            total_count=25,
+            items_per_page=10,
+            page=1,
+            has_more=True,
+        )
+        data = pagination.model_dump()
+        assert data["pages"] == 3
+
 
 class TestCursorPagination:
     """Tests for CursorPagination schema."""
@@ -469,7 +551,7 @@ class TestOffsetPaginatedResponse:
                 pagination=OffsetPagination(
                     total_count=0, items_per_page=10, page=1, has_more=False
                 ),
-                pagination_type=PaginationType.CURSOR,  # type: ignore[arg-type]
+                pagination_type=PaginationType.CURSOR,  # type: ignore[arg-type]  # ty:ignore[invalid-argument-type]
             )
 
     def test_filter_attributes_defaults_to_none(self):
@@ -556,7 +638,7 @@ class TestCursorPaginatedResponse:
                 pagination=CursorPagination(
                     next_cursor=None, items_per_page=10, has_more=False
                 ),
-                pagination_type=PaginationType.OFFSET,  # type: ignore[arg-type]
+                pagination_type=PaginationType.OFFSET,  # type: ignore[arg-type]  # ty:ignore[invalid-argument-type]
             )
 
     def test_full_serialization(self):

uv.lock

@@ -33,6 +33,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/38/0e/27be9fdef66e72d64c0cdc3cc2823101b80585f8119b5c112c2e8f5f7dab/anyio-4.12.1-py3-none-any.whl", hash = "sha256:d405828884fc140aa80a3c667b8beed277f1dfedec42ba031bd6ac3db606ab6c", size = 113592, upload-time = "2026-01-06T11:45:19.497Z" },
 ]
 
+[[package]]
+name = "async-lru"
+version = "2.3.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/e8/1f/989ecfef8e64109a489fff357450cb73fa73a865a92bd8c272170a6922c2/async_lru-2.3.0.tar.gz", hash = "sha256:89bdb258a0140d7313cf8f4031d816a042202faa61d0ab310a0a538baa1c24b6", size = 16332, upload-time = "2026-03-19T01:04:32.413Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/e5/e2/c2e3abf398f80732e58b03be77bde9022550d221dd8781bf586bd4d97cc1/async_lru-2.3.0-py3-none-any.whl", hash = "sha256:eea27b01841909316f2cc739807acea1c623df2be8c5cfad7583286397bb8315", size = 8403, upload-time = "2026-03-19T01:04:30.883Z" },
+]
+
 [[package]]
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 source = { editable = "." }
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@@ -282,10 +346,14 @@ pytest = [
 
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+    { name = "bcrypt" },
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     { name = "pytest-anyio" },
     { name = "pytest-cov" },
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     { name = "pytest" },
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zensical.toml

@@ -2,10 +2,15 @@
 site_name = "FastAPI Toolsets"
 site_description = "Production-ready utilities for FastAPI applications."
 site_author = "d3vyce"
-site_url = "https://fastapi-toolsets.d3vyce.fr"
+site_url = "https://fastapi-toolsets.d3vyce.fr/"
 copyright = "Copyright © 2026 d3vyce"
 repo_url = "https://github.com/d3vyce/fastapi-toolsets"
 
+[project.extra.version]
+provider = "mike"
+default = "stable"
+alias = true
+
 [project.theme]
 custom_dir = "docs/overrides"
 language = "en"
@@ -140,6 +145,9 @@ Examples = [
 
 [[project.nav]]
 Migration = [
+    {"v5.0" = "migration/v5.md"},
+    {"v4.0" = "migration/v4.md"},
+    {"v3.0" = "migration/v3.md"},
     {"v2.0" = "migration/v2.md"},
 ]