feat: add lateral_load() for efficient Many:One eager loading via JOIN LATERAL

* feat: support relation tuples in order_fields for cross-table sorting

* docs: update crud module

.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
@@ -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@v6
         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@v6
         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
+        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@v5
-        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

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**
@@ -92,8 +92,8 @@ To skip the `COUNT(*)` query for better performance on large tables, pass `inclu
 
 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**
@@ -132,8 +132,8 @@ Pass `next_cursor` as the `cursor` query parameter on the next request to advanc
 
 [`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.
 
-```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)

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/v3.md

@@ -0,0 +1,180 @@
+# 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/module/crud.md

@@ -36,7 +36,7 @@ class UserCrud(AsyncCrud[User]):
     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
 
@@ -159,18 +159,15 @@ 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):
@@ -194,32 +191,13 @@ The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.Async
 
 !!! 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 skip it:
+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
-result = await UserCrud.offset_paginate(
-    session=session,
-    page=page,
-    items_per_page=items_per_page,
-    include_total=False,
-    schema=UserRead,
-)
-```
-
-#### Pagination params dependency
-
-!!! info "Added in `v2.4.1`"
-
-Use [`offset_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_params) to generate a FastAPI dependency that injects `page` and `items_per_page` from query parameters with configurable defaults and a `max_page_size` cap:
-
-```python
-from typing import Annotated
-from fastapi import Depends
-
 @router.get("")
-async def list_users(
+async def get_users(
     session: SessionDep,
-    params: Annotated[dict, Depends(UserCrud.offset_params(default_page_size=20, max_page_size=100))],
+    params: Annotated[dict, Depends(UserCrud.offset_paginate_params(include_total=False))],
 ) -> OffsetPaginatedResponse[UserRead]:
     return await UserCrud.offset_paginate(session=session, **params, schema=UserRead)
 ```
@@ -230,15 +208,9 @@ async def list_users(
 @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):
@@ -291,24 +263,6 @@ PostCrud = CrudFactory(model=Post, cursor_column=Post.id)
 PostCrud = CrudFactory(model=Post, cursor_column=Post.created_at)
 ```
 
-#### Pagination params dependency
-
-!!! info "Added in `v2.4.1`"
-
-Use [`cursor_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_params) to inject `cursor` and `items_per_page` from query parameters with a `max_page_size` cap:
-
-```python
-from typing import Annotated
-from fastapi import Depends
-
-@router.get("")
-async def list_users(
-    session: SessionDep,
-    params: Annotated[dict, Depends(UserCrud.cursor_params(default_page_size=20, max_page_size=100))],
-) -> CursorPaginatedResponse[UserRead]:
-    return await UserCrud.cursor_paginate(session=session, **params, schema=UserRead)
-```
-
 ### Unified endpoint (both strategies)
 
 !!! info "Added in `v2.3.0`"
@@ -316,25 +270,14 @@ async def list_users(
 [`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)
 ```
 
 ```
@@ -342,25 +285,6 @@ GET /users?pagination_type=offset&page=2&items_per_page=10
 GET /users?pagination_type=cursor&cursor=eyJ2YWx1ZSI6...&items_per_page=10
 ```
 
-#### Pagination params dependency
-
-!!! info "Added in `v2.4.1`"
-
-Use [`paginate_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.paginate_params) to inject all parameters at once with configurable defaults and a `max_page_size` cap:
-
-```python
-from typing import Annotated
-from fastapi import Depends
-from fastapi_toolsets.schemas import PaginatedResponse
-
-@router.get("")
-async def list_users(
-    session: SessionDep,
-    params: Annotated[dict, Depends(UserCrud.paginate_params(default_page_size=20, max_page_size=100))],
-) -> PaginatedResponse[UserRead]:
-    return await UserCrud.paginate(session, **params, schema=UserRead)
-```
-
 ## 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).
@@ -400,49 +324,63 @@ 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(
@@ -464,7 +402,47 @@ 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
 {
@@ -474,57 +452,19 @@ 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 "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"`.
-
-`filter_by` and `filters` can be combined — both are applied with AND logic.
-
-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:
-
-```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)
-```
+!!! 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).
 
 ## 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(
@@ -532,46 +472,80 @@ 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`"
@@ -656,12 +630,11 @@ async def get_user(session: SessionDep, uuid: UUID) -> Response[UserRead]:
     )
 
 @router.get("")
-async def list_users(session: SessionDep, page: int = 1) -> OffsetPaginatedResponse[UserRead]:
-    return await crud.UserCrud.offset_paginate(
-        session=session,
-        page=page,
-        schema=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, **params, schema=UserRead)
 ```
 
 The schema must have `from_attributes=True` (or inherit from [`PydanticBase`](../reference/schemas.md#fastapi_toolsets.schemas.PydanticBase)) so it can be built from SQLAlchemy model instances.

docs/module/fixtures.md

@@ -38,18 +38,20 @@ 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 +60,60 @@ 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.
 
+### 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)]
+
+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
+await load_fixtures_by_context(session, fixtures, Context.BASE, 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 +121,44 @@ 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
+
+[`get_obj_by_attr`](../reference/fixtures.md#fastapi_toolsets.fixtures.utils.get_obj_by_attr) retrieves a specific instance from a fixture function by attribute value — useful when building cross-fixture `depends_on` relationships:
+
+```python
+from fastapi_toolsets.fixtures import get_obj_by_attr
+
+@fixtures.register(depends_on=["roles"])
+def users():
+    admin_role = get_obj_by_attr(roles, "name", "admin")
+    return [User(id=1, username="alice", role_id=admin_role.id)]
+```
+
+Raises `StopIteration` if no matching instance is found.
 
 ## Pytest integration
 
@@ -111,7 +187,6 @@ async def test_user_can_login(fixture_users: list[User], fixture_roles: list[Rol
     ...
 ```
 
-
 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/models.md

@@ -117,139 +117,118 @@ class Article(Base, UUIDMixin, TimestampMixin):
     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:
-
-| 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 |
-
-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`:
-
-| Decorator | `on_update` behaviour |
-|---|---|
-| `@watch("status", "role")` | Only fires when `status` or `role` changes |
-| *(no decorator)* | Fires when **any** mapped field changes |
-
-`@watch` is inherited through the class hierarchy. If a subclass does not declare its own `@watch`, it uses the filter from the nearest decorated parent. Applying `@watch` on the subclass overrides the parent's filter:
+Event dispatch requires [`EventSession`](../reference/models.md#fastapi_toolsets.models.EventSession). Pass it as the session class when creating your session factory:
 
 ```python
-@watch("status")
-class Order(Base, UUIDMixin, WatchedFieldsMixin):
+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)
+```
+
+!!! info "Callbacks fire on `session.commit()` only — not on savepoints."
+    Savepoints created by [`get_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 |
+|---|---|
+| `ModelEvent.CREATE` | After `INSERT` commit |
+| `ModelEvent.DELETE` | After `DELETE` commit |
+| `ModelEvent.UPDATE` | After `UPDATE` commit on a watched field |
+
+!!! warning "Callbacks fire only for ORM-level changes. Rows updated via raw SQL (`UPDATE ... SET ...`) are not detected."
+
+### 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
+class Order(Base, UUIDMixin):
+    __watched_fields__ = ("status",)
     ...
 
 class UrgentOrder(Order):
-    # inherits @watch("status") — on_update fires only for status changes
+    # inherits __watched_fields__ = ("status",)
     ...
 
-@watch("priority")
 class PriorityOrder(Order):
-    # overrides parent — on_update fires only for priority changes
+    __watched_fields__ = ("priority",)
+    # overrides parent — UPDATE fires only for priority changes
     ...
 ```
 
-#### Option 1 — catch-all with `on_event`
+### Registering handlers
 
-Override `on_event` to handle all event types in one place. The specific methods delegate here by default:
+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, WatchedFieldsMixin, watch
+from fastapi_toolsets.models import ModelEvent, UUIDMixin, listens_for
 
-@watch("status")
-class Order(Base, UUIDMixin, WatchedFieldsMixin):
+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."
-
-!!! warning "Callbacks fire when the **outermost active context** (savepoint or transaction) commits."
-    If you create several related objects using `CrudFactory.create` and need
-    callbacks to see all of them (including associations), wrap the whole
-    operation in a single [`get_transaction`](db.md) or [`lock_tables`](db.md)
-    block. Without it, each `create` call commits its own savepoint and
-    `on_create` fires before the remaining objects exist.
-
-    ```python
-    from fastapi_toolsets.db import get_transaction
-
-    async with get_transaction(session):
-        order = await OrderCrud.create(session, order_data)
-        item  = await ItemCrud.create(session, item_data)
-        await session.refresh(order, attribute_names=["items"])
-        order.items.append(item)
-    # on_create fires here for both order and item,
-    # with the full association already committed.
-    ```
-
-## 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

@@ -79,9 +79,6 @@ The examples above are already compatible with parallel test execution with `pyt
 
 ## 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:
 
 ```python

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/routes.py

@@ -2,7 +2,6 @@ from typing import Annotated
 
 from fastapi import APIRouter, Depends
 
-from fastapi_toolsets.crud import OrderByClause
 from fastapi_toolsets.schemas import (
     CursorPaginatedResponse,
     OffsetPaginatedResponse,
@@ -22,21 +21,18 @@ async def list_articles_offset(
     session: SessionDep,
     params: Annotated[
         dict,
-        Depends(ArticleCrud.offset_params(default_page_size=20, max_page_size=100)),
+        Depends(
+            ArticleCrud.offset_paginate_params(
+                default_page_size=20,
+                max_page_size=100,
+                default_order_field=Article.created_at,
+            )
+        ),
     ],
-    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)),
-    ],
-    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,
     )
 
@@ -46,21 +42,18 @@ async def list_articles_cursor(
     session: SessionDep,
     params: Annotated[
         dict,
-        Depends(ArticleCrud.cursor_params(default_page_size=20, max_page_size=100)),
+        Depends(
+            ArticleCrud.cursor_paginate_params(
+                default_page_size=20,
+                max_page_size=100,
+                default_order_field=Article.created_at,
+            )
+        ),
     ],
-    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)),
-    ],
-    search: str | None = None,
 ) -> CursorPaginatedResponse[ArticleRead]:
     return await ArticleCrud.cursor_paginate(
         session=session,
         **params,
-        search=search,
-        filter_by=filter_by or None,
-        order_by=order_by,
         schema=ArticleRead,
     )
 
@@ -70,20 +63,17 @@ async def list_articles(
     session: SessionDep,
     params: Annotated[
         dict,
-        Depends(ArticleCrud.paginate_params(default_page_size=20, max_page_size=100)),
+        Depends(
+            ArticleCrud.paginate_params(
+                default_page_size=20,
+                max_page_size=100,
+                default_order_field=Article.created_at,
+            )
+        ),
     ],
-    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)),
-    ],
-    search: str | None = None,
 ) -> PaginatedResponse[ArticleRead]:
     return await ArticleCrud.paginate(
         session,
         **params,
-        search=search,
-        filter_by=filter_by or None,
-        order_by=order_by,
         schema=ArticleRead,
     )

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "fastapi-toolsets"
-version = "2.4.3"
+version = "3.0.3"
 description = "Production-ready utilities for FastAPI applications"
 readme = "README.md"
 license = "MIT"
@@ -80,8 +80,9 @@ tests = [
     "pytest>=8.0.0",
 ]
 docs = [
+    "mike",
     "mkdocstrings-python>=2.0.2",
-    "zensical>=0.0.23",
+    "zensical>=0.0.30",
 ]
 
 [build-system]
@@ -104,3 +105,6 @@ 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

@@ -21,4 +21,4 @@ Example usage:
         return Response(data={"user": user.username}, message="Success")
 """
 
-__version__ = "2.4.3"
+__version__ = "3.0.3"

src/fastapi_toolsets/crud/__init__.py

@@ -1,28 +1,38 @@
 """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
+from .factory import AsyncCrud, CrudFactory, lateral_load
 from .search import SearchConfig, get_searchable_fields
 
 __all__ = [
     "AsyncCrud",
     "CrudFactory",
+    "lateral_load",
     "FacetFieldType",
     "get_searchable_fields",
     "InvalidFacetFilterError",
+    "InvalidSearchColumnError",
     "JoinType",
     "M2MFieldType",
     "NoSearchableFieldsError",
     "OrderByClause",
+    "OrderFieldType",
     "PaginationType",
     "SearchConfig",
     "SearchFieldType",
+    "UnsupportedFacetTypeError",
 ]

src/fastapi_toolsets/crud/search.py

@@ -2,17 +2,32 @@
 
 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_, func, or_, select
 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]] = []
@@ -150,8 +176,13 @@ 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 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 +191,12 @@ 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
 
 
@@ -212,23 +233,47 @@ 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)
 
-        # Apply base joins (already done on main query, but needed here independently)
+        if is_array:
+            unnested = func.unnest(column).label(column.key)
+            q = select(unnested).select_from(model).distinct()
+        else:
+            q = select(column).select_from(model).distinct()
+
+        # Apply base joins (deduplicated) — needed here independently
+        seen_joins: set[str] = set()
         for rel in base_joins or []:
-            q = q.outerjoin(rel)
+            rel_key = str(rel)
+            if rel_key not in seen_joins:
+                seen_joins.add(rel_key)
+                q = q.outerjoin(rel)
 
-        # Add any extra joins required by this facet field that aren't already in base_joins
+        # Add any extra joins required by this facet field that aren't already applied
         for rel in rels:
-            if str(rel) not in existing_join_keys:
+            rel_key = str(rel)
+            if rel_key not in existing_join_keys and rel_key not in seen_joins:
+                seen_joins.add(rel_key)
                 q = q.outerjoin(rel)
 
         if base_filters:
             q = q.where(and_(*base_filters))
 
-        q = q.order_by(column)
+        if is_array:
+            q = q.order_by(unnested)
+        else:
+            q = q.order_by(column)
         result = await session.execute(q)
-        values = [row[0] for row in result.all() if row[0] is not None]
+        col_type = column.property.columns[0].type
+        enum_class = getattr(col_type, "enum_class", None)
+        values = [
+            row[0].name
+            if (enum_class is not None and isinstance(row[0], enum_class))
+            else row[0]
+            for row in result.all()
+            if row[0] is not None
+        ]
         return key, values
 
     pairs = await asyncio.gather(
@@ -237,6 +282,22 @@ async def build_facets(
     return dict(pairs)
 
 
+_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],
@@ -282,9 +343,42 @@ 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.append(column.in_([coerce(v) for v in value]))
+            else:
+                filters.append(column == coerce(value))
+        elif isinstance(col_type, ARRAY):
+            if isinstance(value, list):
+                filters.append(column.overlap(value))
+            else:
+                filters.append(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) -> Any:
+                    if isinstance(v, enum_class):
+                        return v
+                    return enum_class[v]  # lookup by name: "PENDING", "RED"
+
+                if isinstance(value, list):
+                    filters.append(column.in_([_coerce_enum(v) for v in value]))
+                else:
+                    filters.append(column == _coerce_enum(value))
+            else:  # pragma: no cover
+                if isinstance(value, list):
+                    filters.append(column.in_(value))
+                else:
+                    filters.append(column == value)
+        elif isinstance(col_type, _EQUALITY_TYPES):
+            if isinstance(value, list):
+                filters.append(column.in_(value))
+            else:
+                filters.append(column == value)
         else:
-            filters.append(column == value)
+            raise UnsupportedFacetTypeError(key, type(col_type).__name__)
 
     return filters, joins

src/fastapi_toolsets/db.py

@@ -24,9 +24,12 @@ __all__ = [
 ]
 
 
+_SessionT = TypeVar("_SessionT", bound=AsyncSession)
+
+
 def create_db_dependency(
-    session_maker: async_sessionmaker[AsyncSession],
-) -> Callable[[], AsyncGenerator[AsyncSession, None]]:
+    session_maker: async_sessionmaker[_SessionT],
+) -> Callable[[], AsyncGenerator[_SessionT, None]]:
     """Create a FastAPI dependency for database sessions.
 
     Creates a dependency function that yields a session and auto-commits
@@ -54,7 +57,7 @@ def create_db_dependency(
         ```
     """
 
-    async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async def get_db() -> AsyncGenerator[_SessionT, None]:
         async with session_maker() as session:
             await session.connection()
             yield session
@@ -65,8 +68,8 @@ def create_db_dependency(
 
 
 def create_db_context(
-    session_maker: async_sessionmaker[AsyncSession],
-) -> Callable[[], AbstractAsyncContextManager[AsyncSession]]:
+    session_maker: async_sessionmaker[_SessionT],
+) -> Callable[[], AbstractAsyncContextManager[_SessionT]]:
     """Create a context manager for database sessions.
 
     Creates a context manager for use outside of FastAPI request handlers,

src/fastapi_toolsets/exceptions/__init__.py

@@ -7,9 +7,11 @@ from .exceptions import (
     ForbiddenError,
     InvalidFacetFilterError,
     InvalidOrderFieldError,
+    InvalidSearchColumnError,
     NoSearchableFieldsError,
     NotFoundError,
     UnauthorizedError,
+    UnsupportedFacetTypeError,
     generate_error_responses,
 )
 from .handler import init_exceptions_handlers
@@ -23,7 +25,9 @@ __all__ = [
     "init_exceptions_handlers",
     "InvalidFacetFilterError",
     "InvalidOrderFieldError",
+    "InvalidSearchColumnError",
     "NoSearchableFieldsError",
     "NotFoundError",
     "UnauthorizedError",
+    "UnsupportedFacetTypeError",
 ]

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."""
 

src/fastapi_toolsets/exceptions/handler.py

@@ -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(),
     )
 

src/fastapi_toolsets/fixtures/registry.py

@@ -2,6 +2,7 @@
 
 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
@@ -12,6 +13,13 @@ 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]
+
+
 @dataclass
 class Fixture:
     """A fixture definition with metadata."""
@@ -50,26 +58,51 @@ 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")]
+        # load_fixtures_by_context(..., Context.BASE, Context.TESTING)
+        # → loads both User(admin) and User(tester) under the "users" name
+        ```
     """
 
     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 +176,73 @@ 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.
+        """
         if name not in self._fixtures:
             raise KeyError(f"Fixture '{name}' not found")
-        return self._fixtures[name]
+        variants = self._fixtures[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.  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")
+        variants = self._fixtures[name]
+        if not contexts:
+            return list(variants)
+        context_values = set(_normalize_contexts(contexts))
+        return [v for v in variants if set(v.contexts) & context_values]
 
     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_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 = set(_normalize_contexts(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
 
@@ -185,9 +264,20 @@ class FixtureRegistry:
                 raise ValueError(f"Circular dependency detected: {name}")
 
             visiting.add(name)
-            fixture = self.get(name)
+            variants = self._fixtures.get(name)
+            if variants is None:
+                raise KeyError(f"Fixture '{name}' not found")
 
-            for dep in fixture.depends_on:
+            # Union of depends_on across all variants, preserving first-seen order.
+            seen_deps: set[str] = set()
+            all_deps: list[str] = []
+            for variant in variants:
+                for dep in variant.depends_on:
+                    if dep not in seen_deps:
+                        all_deps.append(dep)
+                        seen_deps.add(dep)
+
+            for dep in all_deps:
                 visit(dep)
 
             visiting.remove(name)
@@ -199,7 +289,7 @@ class FixtureRegistry:
 
         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:
@@ -209,7 +299,9 @@ 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:

src/fastapi_toolsets/fixtures/utils.py

@@ -1,8 +1,11 @@
 """Fixture loading utilities for database seeding."""
 
 from collections.abc import Callable, Sequence
+from enum import Enum
 from typing import Any
 
+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
 
@@ -10,23 +13,177 @@ from ..db import get_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 _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())
+
+
+async def _batch_insert(
+    session: AsyncSession,
+    model_cls: type[DeclarativeBase],
+    instances: list[DeclarativeBase],
+) -> None:
+    """INSERT all instances — raises on conflict (no duplicate handling)."""
+    dicts = [_instance_to_dict(i) for i in instances]
+    for group_dicts, _ in _group_by_column_set(dicts, instances):
+        await session.execute(pg_insert(model_cls).values(group_dicts))
+
+
+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."""
+    mapper = model_cls.__mapper__
+    pk_names = [col.name for col in mapper.primary_key]
+    pk_names_set = set(pk_names)
+    non_pk_cols = [
+        prop.key
+        for prop in mapper.column_attrs
+        if not any(col.name in pk_names_set for col in prop.columns)
+    ]
+
+    dicts = [_instance_to_dict(i) for i in instances]
+    for group_dicts, _ in _group_by_column_set(dicts, instances):
+        stmt = pg_insert(model_cls).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."""
+    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[DeclarativeBase] = list(no_pk)
+    if no_pk:
+        no_pk_dicts = [_instance_to_dict(i) for i in no_pk]
+        for group_dicts, _ in _group_by_column_set(no_pk_dicts, no_pk):
+            await session.execute(pg_insert(model_cls).values(group_dicts))
+
+    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
+
+
 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_variants(name, *contexts)
+            if contexts is not None
+            else registry.get_variants(name)
+        )
+
+        if contexts is not None and not variants:
+            variants = registry.get_variants(name)
+
+        if not variants:
+            results[name] = []
+            continue
+
+        instances = [inst for v in variants for inst in v.func()]
 
         if not instances:
             results[name] = []
@@ -36,25 +193,17 @@ async def _load_ordered(
         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)
-
-                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)
+            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)
 
         results[name] = loaded
         logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
@@ -109,6 +258,8 @@ 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 +276,7 @@ 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 +284,15 @@ 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.BASE``, ``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/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

@@ -7,15 +7,15 @@ from .columns import (
     UUIDv7Mixin,
     UpdatedAtMixin,
 )
-from .watched import ModelEvent, WatchedFieldsMixin, watch
+from .watched import EventSession, ModelEvent, listens_for
 
 __all__ = [
+    "EventSession",
     "ModelEvent",
     "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

@@ -1,11 +1,9 @@
 """Field-change monitoring via SQLAlchemy session events."""
 
-import asyncio
 import inspect
-import weakref
-from collections.abc import Awaitable
+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 inspect as sa_inspect
@@ -14,65 +12,114 @@ from sqlalchemy.orm.attributes import set_committed_value as _sa_set_committed_v
 
 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"
-_SESSION_SAVEPOINT_DEPTH = "_ft_sp_depth"
 
 
 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]]] = {}
+_WATCHED_MODELS: set[type] = set()
+_WATCHED_CACHE: dict[type, bool] = {}
+_HANDLER_CACHE: dict[tuple[type, ModelEvent], list[Callable[..., Any]]] = {}
+
+
+def _invalidate_caches() -> None:
+    """Clear lookup caches after handler registration."""
+    _WATCHED_CACHE.clear()
+    _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)
+        _WATCHED_MODELS.add(model_class)
+        _invalidate_caches()
+        return fn
 
     return decorator
 
 
+def _is_watched(obj: Any) -> bool:
+    """Return True if *obj*'s type (or any ancestor) has registered handlers."""
+    cls = type(obj)
+    try:
+        return _WATCHED_CACHE[cls]
+    except KeyError:
+        result = any(klass in _WATCHED_MODELS for klass in cls.__mro__)
+        _WATCHED_CACHE[cls] = result
+        return result
+
+
+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) -> list[str] | None:
-    """Return the watched fields for *cls*, walking the MRO to inherit from parents."""
-    for klass in cls.__mro__:
-        if klass in _WATCHED_FIELDS:
-            return _WATCHED_FIELDS[klass]
-    return None
+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(
@@ -93,50 +140,32 @@ def _upsert_changes(
         pending[key] = (obj, changes)
 
 
-@event.listens_for(AsyncSession.sync_session_class, "after_transaction_create")
-def _after_transaction_create(session: Any, transaction: Any) -> None:
-    if transaction.nested:
-        session.info[_SESSION_SAVEPOINT_DEPTH] = (
-            session.info.get(_SESSION_SAVEPOINT_DEPTH, 0) + 1
-        )
-
-
-@event.listens_for(AsyncSession.sync_session_class, "after_transaction_end")
-def _after_transaction_end(session: Any, transaction: Any) -> None:
-    if transaction.nested:
-        depth = session.info.get(_SESSION_SAVEPOINT_DEPTH, 0)
-        if depth > 0:  # pragma: no branch
-            session.info[_SESSION_SAVEPOINT_DEPTH] = depth - 1
-
-
 @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 _is_watched(obj):
+            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 _is_watched(obj):
+            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 _is_watched(obj):
             continue
 
-        # None = not in dict = watch all fields; list = specific fields only
         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
@@ -154,116 +183,108 @@ 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 inspect.isawaitable(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:
-    if session.info.get(_SESSION_SAVEPOINT_DEPTH, 0) > 0:
-        return
+class EventSession(AsyncSession):
+    """AsyncSession subclass that dispatches lifecycle callbacks after commit."""
 
-    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 commit(self) -> None:  # noqa: C901
+        await super().commit()
 
-    if creates and deletes:
-        transient_ids = {id(o) for o in creates} & {id(o) for o in deletes}
-        if transient_ids:
-            creates = [o for o in creates if id(o) not in transient_ids]
-            deletes = [o for o in deletes if id(o) not in transient_ids]
+        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, {}
+        )
+
+        if not creates and not deletes and not field_changes:
+            return
+
+        # 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
+                }
+
+        # 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 transient_ids
+                k: v for k, v in field_changes.items() if k not in deleted_ids
             }
 
-    if not creates and not deletes and not field_changes:
-        return
+        # 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
+            }
 
-    try:
-        loop = asyncio.get_running_loop()
-    except RuntimeError:
-        return
+        # Dispatch CREATE callbacks.
+        for obj in creates:
+            try:
+                state = sa_inspect(obj, raiseerr=False)
+                if (
+                    state is None or state.detached or state.transient
+                ):  # pragma: no cover
+                    continue
+                await self.refresh(obj)
+                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)
 
-    for obj in creates:
-        _schedule_with_snapshot(loop, obj, obj.on_create)
+        # 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)
 
-    for obj in deletes:
-        _schedule_with_snapshot(loop, obj, obj.on_delete)
+        # Dispatch UPDATE callbacks.
+        for obj, changes in field_changes.values():
+            try:
+                state = sa_inspect(obj, raiseerr=False)
+                if (
+                    state is None or state.detached or state.transient
+                ):  # pragma: no cover
+                    continue
+                await self.refresh(obj)
+                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)
 
-    for obj, changes in field_changes.values():
-        _schedule_with_snapshot(loop, obj, obj.on_update, changes)
-
-
-class WatchedFieldsMixin:
-    """Mixin that enables lifecycle callbacks for SQLAlchemy models."""
-
-    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.
-
-        Args:
-            event: The event type (:attr:`ModelEvent.CREATE`, :attr:`ModelEvent.DELETE`,
-                or :attr:`ModelEvent.UPDATE`).
-            changes: Field changes for :attr:`ModelEvent.UPDATE`, ``None`` otherwise.
-        """
-
-    def on_create(self) -> Awaitable[None] | None:
-        """Called after INSERT commit."""
-        return self.on_event(ModelEvent.CREATE)
-
-    def on_delete(self) -> Awaitable[None] | None:
-        """Called after DELETE commit."""
-        return self.on_event(ModelEvent.DELETE)
-
-    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)
+    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/utils.py

@@ -1,12 +1,12 @@
 """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 import text
 from sqlalchemy.engine import make_url
 from sqlalchemy.ext.asyncio import (
     AsyncSession,
@@ -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 import cleanup_tables, create_database
+from ..models.watched import EventSession
 
 
 def _get_xdist_worker(default_test_db: str) -> str:
@@ -269,15 +244,14 @@ async def create_db_session(
         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
+        )
+        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

@@ -162,6 +162,8 @@ 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]] = {}
 

src/fastapi_toolsets/types.py

@@ -15,13 +15,15 @@ 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]]
+LateralJoinType = list[tuple[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

@@ -2,6 +2,7 @@
 
 import os
 import uuid
+from enum import Enum
 
 import pytest
 from pydantic import BaseModel
@@ -12,13 +13,16 @@ from sqlalchemy import (
     Column,
     Date,
     DateTime,
+    Enum as SAEnum,
     ForeignKey,
     Integer,
+    JSON,
     Numeric,
     String,
     Table,
     Uuid,
 )
+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
 
@@ -57,6 +61,7 @@ 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 +141,57 @@ 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 RoleCreate(BaseModel):
     """Schema for creating a role."""
 
@@ -270,6 +326,61 @@ 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)

tests/test_crud.py

@@ -6,9 +6,15 @@ import pytest
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
 
-from fastapi_toolsets.crud import CrudFactory, PaginationType
-from fastapi_toolsets.crud.factory import AsyncCrud, _CursorDirection
+from fastapi_toolsets.crud import CrudFactory, PaginationType, lateral_load
+from fastapi_toolsets.crud.factory import (
+    AsyncCrud,
+    _CursorDirection,
+    _LateralLoad,
+    _ResolvedLateral,
+)
 from fastapi_toolsets.exceptions import NotFoundError
+from fastapi_toolsets.schemas import PydanticBase
 
 from .conftest import (
     EventCreate,
@@ -38,6 +44,10 @@ from .conftest import (
     Tag,
     TagCreate,
     TagCrud,
+    Transfer,
+    TransferCreate,
+    TransferCrud,
+    TransferRead,
     User,
     UserCreate,
     UserCrud,
@@ -47,6 +57,12 @@ from .conftest import (
 )
 
 
+class UserWithRoleRead(PydanticBase):
+    id: uuid.UUID
+    username: str
+    role: RoleRead | None = None
+
+
 class TestCrudFactory:
     """Tests for CrudFactory."""
 
@@ -204,11 +220,97 @@ class TestResolveLoadOptions:
         assert crud._resolve_load_options(None) is None
 
     def test_empty_list_overrides_default(self):
-        """An empty list is a valid override and disables default_load_options."""
+        """An explicit empty list disables default_load_options (no options applied)."""
         default = [selectinload(User.role)]
         crud = CrudFactory(User, default_load_options=default)
-        # Empty list is not None, so it should replace default
-        assert crud._resolve_load_options([]) == []
+        # Empty list replaces default; None and [] are both falsy → no options applied
+        assert not 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:
@@ -269,13 +371,6 @@ class TestDefaultLoadOptionsIntegration:
         self, db_session: AsyncSession
     ):
         """default_load_options loads relationships automatically on offset_paginate()."""
-        from fastapi_toolsets.schemas import PydanticBase
-
-        class UserWithRoleRead(PydanticBase):
-            id: uuid.UUID
-            username: str
-            role: RoleRead | None = None
-
         UserWithDefaultLoad = CrudFactory(
             User, default_load_options=[selectinload(User.role)]
         )
@@ -290,6 +385,43 @@ 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_load_options_overrides_default_load_options(
         self, db_session: AsyncSession
@@ -1250,6 +1382,128 @@ 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."""
 
@@ -2213,12 +2467,7 @@ class TestCursorPaginateExtraOptions:
     @pytest.mark.anyio
     async def test_with_load_options(self, db_session: AsyncSession):
         """cursor_paginate passes load_options to the query."""
-        from fastapi_toolsets.schemas import CursorPagination, PydanticBase
-
-        class UserWithRoleRead(PydanticBase):
-            id: uuid.UUID
-            username: str
-            role: RoleRead | None = None
+        from fastapi_toolsets.schemas import CursorPagination
 
         role = await RoleCrud.create(db_session, RoleCreate(name="manager"))
         for i in range(3):
@@ -2584,3 +2833,445 @@ class TestPaginate:
 
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count is None
+
+
+class TestLateralLoadValidation:
+    """lateral_load() raises immediately for bad relationship types."""
+
+    def test_valid_many_to_one_returns_marker(self):
+        """lateral_load() on a Many:One rel returns a _LateralLoad with rel_attr set."""
+        marker = lateral_load(User.role)
+        assert isinstance(marker, _LateralLoad)
+        assert marker.rel_attr is User.role
+
+    def test_raises_type_error_for_plain_column(self):
+        """lateral_load() raises TypeError when passed a plain column."""
+        with pytest.raises(TypeError, match="relationship attribute"):
+            lateral_load(User.username)
+
+    def test_raises_value_error_for_many_to_many(self):
+        """lateral_load() raises ValueError for Many:Many (secondary table)."""
+        with pytest.raises(ValueError, match="Many:Many"):
+            lateral_load(Post.tags)
+
+    def test_raises_value_error_for_one_to_many(self):
+        """lateral_load() raises ValueError for One:Many (uselist=True)."""
+        with pytest.raises(ValueError, match="One:Many"):
+            lateral_load(Role.users)
+
+
+class TestLateralLoadInSubclass:
+    """lateral_load() markers in default_load_options are processed at class definition."""
+
+    def test_marker_extracted_from_default_load_options(self):
+        """_LateralLoad is removed from default_load_options and stored in _resolved_lateral."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        assert UserLateralCrud.default_load_options is None
+        assert UserLateralCrud._resolved_lateral is not None
+
+    def test_resolved_lateral_has_one_join_and_eager(self):
+        """_resolved_lateral contains exactly one join and one eager option."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        resolved = UserLateralCrud._resolved_lateral
+        assert isinstance(resolved, _ResolvedLateral)
+        assert len(resolved.joins) == 1
+        assert len(resolved.eager) == 1
+
+    def test_regular_options_preserved_alongside_lateral(self):
+        """Non-lateral opts stay in default_load_options; lateral marker is extracted."""
+        regular = selectinload(User.role)
+
+        class UserMixedCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role), regular]
+
+        assert UserMixedCrud._resolved_lateral is not None
+        assert UserMixedCrud.default_load_options == [regular]
+
+    def test_no_lateral_leaves_default_load_options_untouched(self):
+        """When no lateral marker is present, default_load_options is unchanged."""
+        opts = [selectinload(User.role)]
+
+        class UserNormalCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = opts
+
+        assert UserNormalCrud.default_load_options is opts
+        assert UserNormalCrud._resolved_lateral is None
+
+    def test_no_default_load_options_leaves_resolved_lateral_none(self):
+        """_resolved_lateral stays None when default_load_options is not set."""
+
+        class UserPlainCrud(AsyncCrud[User]):
+            model = User
+
+        assert UserPlainCrud._resolved_lateral is None
+
+
+class TestResolveLoadOptionsWithLateral:
+    """_resolve_load_options always appends lateral eager options."""
+
+    def test_lateral_eager_included_when_no_call_site_opts(self):
+        """contains_eager from lateral_load is returned when load_options=None."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        resolved = UserLateralCrud._resolve_load_options(None)
+        assert resolved is not None
+        assert len(resolved) == 1  # the contains_eager
+
+    def test_call_site_opts_bypass_lateral_eager(self):
+        """When call-site load_options are provided, lateral eager is NOT appended."""
+        extra = selectinload(User.role)
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        resolved = UserLateralCrud._resolve_load_options([extra])
+        assert resolved is not None
+        assert len(resolved) == 1  # only the call-site option; lateral eager skipped
+
+    def test_lateral_eager_appended_to_default_load_options(self):
+        """default_load_options (regular) + lateral eager are both returned."""
+        regular = selectinload(User.role)
+
+        class UserMixedCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role), regular]
+
+        resolved = UserMixedCrud._resolve_load_options(None)
+        assert resolved is not None
+        assert len(resolved) == 2
+
+
+class TestGetLateralJoins:
+    """_get_lateral_joins merges auto-resolved and manual lateral_joins."""
+
+    def test_returns_none_when_no_lateral_configured(self):
+        """Returns None when neither lateral_joins nor lateral_load is set."""
+
+        class UserPlainCrud(AsyncCrud[User]):
+            model = User
+
+        assert UserPlainCrud._get_lateral_joins() is None
+
+    def test_returns_resolved_lateral_joins(self):
+        """Returns the join tuple built from lateral_load()."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        joins = UserLateralCrud._get_lateral_joins()
+        assert joins is not None
+        assert len(joins) == 1
+
+    def test_manual_lateral_joins_included(self):
+        """Manual lateral_joins class var is included in _get_lateral_joins."""
+        from sqlalchemy import select, true
+
+        manual_sub = select(Role).where(Role.id == User.role_id).lateral("_manual_role")
+
+        class UserManualCrud(AsyncCrud[User]):
+            model = User
+            lateral_joins = [(manual_sub, true())]
+
+        joins = UserManualCrud._get_lateral_joins()
+        assert joins is not None
+        assert len(joins) == 1
+
+    def test_manual_and_auto_lateral_joins_merged(self):
+        """Both manual lateral_joins and auto-resolved from lateral_load are combined."""
+        from sqlalchemy import select, true
+
+        manual_sub = select(Role).where(Role.id == User.role_id).lateral("_manual_role")
+
+        class UserBothCrud(AsyncCrud[User]):
+            model = User
+            lateral_joins = [(manual_sub, true())]
+            default_load_options = [lateral_load(User.role)]
+
+        joins = UserBothCrud._get_lateral_joins()
+        assert joins is not None
+        assert len(joins) == 2
+
+
+class TestLateralLoadIntegration:
+    """lateral_load() in real DB queries: relationship loaded, pagination correct."""
+
+    @pytest.mark.anyio
+    async def test_get_loads_relationship(self, db_session: AsyncSession):
+        """get() populates the relationship via lateral join."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        user = await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="alice@test.com", role_id=role.id),
+        )
+
+        fetched = await UserLateralCrud.get(db_session, [User.id == user.id])
+        assert fetched.role is not None
+        assert fetched.role.name == "admin"
+
+    @pytest.mark.anyio
+    async def test_get_null_fk_preserved(self, db_session: AsyncSession):
+        """User with null role_id still returned (LEFT JOIN behaviour)."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        user = await UserCrud.create(
+            db_session, UserCreate(username="bob", email="bob@test.com")
+        )
+
+        fetched = await UserLateralCrud.get(db_session, [User.id == user.id])
+        assert fetched is not None
+        assert fetched.role is None
+
+    @pytest.mark.anyio
+    async def test_first_loads_relationship(self, db_session: AsyncSession):
+        """first() populates the relationship via lateral join."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="carol", email="carol@test.com", role_id=role.id),
+        )
+
+        user = await UserLateralCrud.first(db_session)
+        assert user is not None
+        assert user.role is not None
+        assert user.role.name == "editor"
+
+    @pytest.mark.anyio
+    async def test_get_multi_loads_relationship(self, db_session: AsyncSession):
+        """get_multi() populates the relationship via lateral join for all rows."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="member"))
+        for i in range(3):
+            await UserCrud.create(
+                db_session,
+                UserCreate(
+                    username=f"user{i}", email=f"u{i}@test.com", role_id=role.id
+                ),
+            )
+
+        users = await UserLateralCrud.get_multi(db_session)
+        assert len(users) == 3
+        assert all(u.role is not None and u.role.name == "member" for u in users)
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_correct_count(self, db_session: AsyncSession):
+        """offset_paginate total_count is not inflated by the lateral join."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        for i in range(5):
+            await UserCrud.create(
+                db_session,
+                UserCreate(
+                    username=f"user{i}", email=f"u{i}@test.com", role_id=role.id
+                ),
+            )
+
+        result = await UserLateralCrud.offset_paginate(
+            db_session, schema=UserWithRoleRead, items_per_page=10
+        )
+        assert result.pagination.total_count == 5
+        assert len(result.data) == 5
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_loads_relationship(self, db_session: AsyncSession):
+        """offset_paginate serializes relationship data loaded via lateral."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="alice@test.com", role_id=role.id),
+        )
+
+        result = await UserLateralCrud.offset_paginate(
+            db_session, schema=UserWithRoleRead, items_per_page=10
+        )
+        assert result.data[0].role is not None
+        assert result.data[0].role.name == "admin"
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_mixed_null_fk(self, db_session: AsyncSession):
+        """offset_paginate returns all users including those with null role_id."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="with_role", email="a@test.com", role_id=role.id),
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="no_role", email="b@test.com")
+        )
+
+        result = await UserLateralCrud.offset_paginate(
+            db_session, schema=UserWithRoleRead, items_per_page=10
+        )
+        assert result.pagination.total_count == 2
+
+    @pytest.mark.anyio
+    async def test_cursor_paginate_loads_relationship(self, db_session: AsyncSession):
+        """cursor_paginate populates the relationship via lateral join."""
+
+        class UserLateralCursorCrud(AsyncCrud[User]):
+            model = User
+            cursor_column = User.id
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        for i in range(3):
+            await UserCrud.create(
+                db_session,
+                UserCreate(
+                    username=f"user{i}", email=f"u{i}@test.com", role_id=role.id
+                ),
+            )
+
+        result = await UserLateralCursorCrud.cursor_paginate(
+            db_session, schema=UserWithRoleRead, items_per_page=10
+        )
+        assert len(result.data) == 3
+        assert all(item.role is not None for item in result.data)
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_with_search_and_lateral(
+        self, db_session: AsyncSession
+    ):
+        """search filter works alongside lateral join."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+            searchable_fields = [User.username]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=role.id),
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com", role_id=role.id)
+        )
+
+        result = await UserLateralCrud.offset_paginate(
+            db_session, schema=UserWithRoleRead, search="alice", items_per_page=10
+        )
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_first_call_site_load_options_bypasses_lateral(
+        self, db_session: AsyncSession
+    ):
+        """When load_options is provided, lateral join is skipped (no conflict)."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        user = await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="alice@test.com", role_id=role.id),
+        )
+
+        # Passing explicit load_options bypasses the lateral join — role loaded via selectinload
+        fetched = await UserLateralCrud.first(
+            db_session,
+            filters=[User.id == user.id],
+            load_options=[selectinload(User.role)],
+        )
+        assert fetched is not None
+        assert fetched.role is not None
+        assert fetched.role.name == "admin"
+
+    @pytest.mark.anyio
+    async def test_get_multi_call_site_load_options_bypasses_lateral(
+        self, db_session: AsyncSession
+    ):
+        """When load_options is provided, lateral join is skipped (no conflict)."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="viewer"))
+        for i in range(2):
+            await UserCrud.create(
+                db_session,
+                UserCreate(username=f"u{i}", email=f"u{i}@test.com", role_id=role.id),
+            )
+
+        # Passing explicit load_options bypasses the lateral join — role loaded via selectinload
+        users = await UserLateralCrud.get_multi(
+            db_session, load_options=[selectinload(User.role)]
+        )
+        assert len(users) == 2
+        assert all(u.role is not None and u.role.name == "viewer" for u in users)
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_call_site_load_options_bypasses_lateral(
+        self, db_session: AsyncSession
+    ):
+        """When load_options is provided, lateral join is skipped (no conflict)."""
+
+        class UserLateralCrud(AsyncCrud[User]):
+            model = User
+            default_load_options = [lateral_load(User.role)]
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+        for i in range(3):
+            await UserCrud.create(
+                db_session,
+                UserCreate(username=f"e{i}", email=f"e{i}@test.com", role_id=role.id),
+            )
+
+        # Passing explicit load_options bypasses the lateral join — role loaded via selectinload
+        result = await UserLateralCrud.offset_paginate(
+            db_session,
+            schema=UserWithRoleRead,
+            items_per_page=10,
+            load_options=[selectinload(User.role)],
+        )
+        assert result.pagination.total_count == 3
+        assert all(item.role is not None for item in result.data)

tests/test_example_pagination_search.py

@@ -97,7 +97,7 @@ class TestAppSessionDep:
         gen = get_db()
         session = await gen.__anext__()
         assert isinstance(session, AsyncSession)
-        await session.close()
+        await gen.aclose()
 
 
 class TestOffsetPagination:
@@ -182,8 +182,7 @@ 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(

tests/test_fixtures.py

@@ -1,6 +1,7 @@
 """Tests for fastapi_toolsets.fixtures module."""
 
 import uuid
+from enum import Enum
 
 import pytest
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -13,10 +14,22 @@ from fastapi_toolsets.fixtures import (
     load_fixtures,
     load_fixtures_by_context,
 )
+from fastapi_toolsets.fixtures.utils import _get_primary_key, _instance_to_dict
 
-from fastapi_toolsets.fixtures.utils import _get_primary_key
+from .conftest import IntRole, Permission, Role, RoleCreate, RoleCrud, User, UserCrud
 
-from .conftest import IntRole, Permission, Role, RoleCrud, User, UserCrud
+
+class AppContext(str, Enum):
+    """Example user-defined str+Enum context."""
+
+    STAGING = "staging"
+    DEMO = "demo"
+
+
+class PlainEnumContext(Enum):
+    """Example user-defined plain Enum context (no str mixin)."""
+
+    STAGING = "staging"
 
 
 class TestContext:
@@ -39,6 +52,86 @@ class TestContext:
         assert Context.TESTING.value == "testing"
 
 
+class TestCustomEnumContext:
+    """Custom Enum types are accepted wherever Context/str are expected."""
+
+    def test_cannot_subclass_context_with_members(self):
+        """Python prohibits extending an Enum that already has members."""
+        with pytest.raises(TypeError):
+
+            class MyContext(Context):  # noqa: F841  # ty: ignore[subclass-of-final-class]
+                STAGING = "staging"
+
+    def test_custom_enum_values_interchangeable_with_context(self):
+        """A custom enum with the same .value as a built-in Context member is
+        treated as the same context — fixtures registered under one are found
+        by the other."""
+
+        class AppContextFull(str, Enum):
+            BASE = "base"
+            STAGING = "staging"
+
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[Context.BASE])
+        def roles():
+            return []
+
+        # AppContextFull.BASE has value "base" — same as Context.BASE
+        fixtures = registry.get_by_context(AppContextFull.BASE)
+        assert len(fixtures) == 1
+
+    def test_custom_enum_registry_default_contexts(self):
+        """FixtureRegistry(contexts=[...]) accepts a custom Enum."""
+        registry = FixtureRegistry(contexts=[AppContext.STAGING])
+
+        @registry.register
+        def data():
+            return []
+
+        fixture = registry.get("data")
+        assert fixture.contexts == ["staging"]
+
+    def test_custom_enum_resolve_context_dependencies(self):
+        """resolve_context_dependencies accepts a custom Enum context."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[AppContext.STAGING])
+        def staging_roles():
+            return []
+
+        order = registry.resolve_context_dependencies(AppContext.STAGING)
+        assert "staging_roles" in order
+
+    @pytest.mark.anyio
+    async def test_custom_enum_e2e(self, db_session: AsyncSession):
+        """End-to-end: register with custom Enum, load with the same Enum."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[AppContext.STAGING])
+        def staging_roles():
+            return [Role(id=uuid.uuid4(), name="staging-admin")]
+
+        result = await load_fixtures_by_context(
+            db_session, registry, AppContext.STAGING
+        )
+        assert len(result["staging_roles"]) == 1
+
+    @pytest.mark.anyio
+    async def test_plain_enum_e2e(self, db_session: AsyncSession):
+        """End-to-end: register with plain Enum, load with the same Enum."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[PlainEnumContext.STAGING])
+        def staging_roles():
+            return [Role(id=uuid.uuid4(), name="plain-staging-admin")]
+
+        result = await load_fixtures_by_context(
+            db_session, registry, PlainEnumContext.STAGING
+        )
+        assert len(result["staging_roles"]) == 1
+
+
 class TestLoadStrategy:
     """Tests for LoadStrategy enum."""
 
@@ -407,6 +500,37 @@ class TestDependencyResolution:
         with pytest.raises(ValueError, match="Circular dependency"):
             registry.resolve_dependencies("a")
 
+    def test_resolve_raises_for_unknown_dependency(self):
+        """KeyError when depends_on references an unregistered fixture."""
+        registry = FixtureRegistry()
+
+        @registry.register(depends_on=["ghost"])
+        def users():
+            return []
+
+        with pytest.raises(KeyError, match="ghost"):
+            registry.resolve_dependencies("users")
+
+    def test_resolve_deduplicates_shared_depends_on_across_variants(self):
+        """A dep shared by two same-name variants appears only once in the order."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[Context.BASE])
+        def roles():
+            return []
+
+        @registry.register(depends_on=["roles"], contexts=[Context.BASE])
+        def items():
+            return []
+
+        @registry.register(depends_on=["roles"], contexts=[Context.TESTING])
+        def items():  # noqa: F811
+            return []
+
+        order = registry.resolve_dependencies("items")
+        assert order.count("roles") == 1
+        assert order.index("roles") < order.index("items")
+
     def test_resolve_context_dependencies(self):
         """Resolve all fixtures for a context with dependencies."""
         registry = FixtureRegistry()
@@ -496,6 +620,52 @@ class TestLoadFixtures:
         count = await RoleCrud.count(db_session)
         assert count == 1
 
+    @pytest.mark.anyio
+    async def test_merge_does_not_overwrite_omitted_nullable_columns(
+        self, db_session: AsyncSession
+    ):
+        """MERGE must not clear nullable columns that the fixture didn't set.
+
+        When a fixture omits a nullable column (e.g. role_id or notes), a re-merge
+        must leave the existing DB value untouched — not overwrite it with NULL.
+        """
+        registry = FixtureRegistry()
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        uid = uuid.uuid4()
+
+        # First load: user has role_id and notes set
+        @registry.register
+        def users():
+            return [
+                User(
+                    id=uid,
+                    username="alice",
+                    email="a@test.com",
+                    role_id=admin.id,
+                    notes="original",
+                )
+            ]
+
+        await load_fixtures(db_session, registry, "users", strategy=LoadStrategy.MERGE)
+
+        # Second load: fixture omits role_id and notes
+        registry2 = FixtureRegistry()
+
+        @registry2.register
+        def users():  # noqa: F811
+            return [User(id=uid, username="alice-updated", email="a@test.com")]
+
+        await load_fixtures(db_session, registry2, "users", strategy=LoadStrategy.MERGE)
+
+        from sqlalchemy import select
+
+        row = (
+            await db_session.execute(select(User).where(User.id == uid))
+        ).scalar_one()
+        assert row.username == "alice-updated"  # updated column changed
+        assert row.role_id == admin.id  # omitted → preserved
+        assert row.notes == "original"  # omitted → preserved
+
     @pytest.mark.anyio
     async def test_load_with_skip_existing_strategy(self, db_session: AsyncSession):
         """Load fixtures with SKIP_EXISTING strategy."""
@@ -795,3 +965,511 @@ class TestGetPrimaryKey:
         instance = Permission(subject="post")  # action is None
         pk = _get_primary_key(instance)
         assert pk is None
+
+
+class TestRegistryGetVariants:
+    """Tests for FixtureRegistry.get and get_variants edge cases."""
+
+    def test_get_raises_value_error_for_multi_variant(self):
+        """get() raises ValueError when the fixture has multiple context variants."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[Context.BASE])
+        def items():
+            return []
+
+        @registry.register(contexts=[Context.TESTING])
+        def items():  # noqa: F811
+            return []
+
+        with pytest.raises(ValueError, match="get_variants"):
+            registry.get("items")
+
+    def test_get_variants_raises_key_error_for_unknown(self):
+        """get_variants() raises KeyError for an unregistered name."""
+        registry = FixtureRegistry()
+        with pytest.raises(KeyError, match="not found"):
+            registry.get_variants("no_such_fixture")
+
+
+class TestInstanceToDict:
+    """Unit tests for the _instance_to_dict helper."""
+
+    def test_explicit_values_included(self):
+        """All explicitly set column values appear in the result."""
+        role_id = uuid.uuid4()
+        instance = Role(id=role_id, name="admin")
+        d = _instance_to_dict(instance)
+        assert d["id"] == role_id
+        assert d["name"] == "admin"
+
+    def test_callable_default_none_excluded(self):
+        """A column whose value is None but has a callable Python-side default
+        (e.g. ``default=uuid.uuid4``) is excluded so the DB generates it."""
+        instance = Role(id=None, name="admin")
+        d = _instance_to_dict(instance)
+        assert "id" not in d
+        assert d["name"] == "admin"
+
+    def test_autoincrement_none_excluded(self):
+        """A column whose value is None but has autoincrement=True is excluded
+        so the DB generates the value via its sequence."""
+        instance = IntRole(id=None, name="admin")
+        d = _instance_to_dict(instance)
+        assert "id" not in d
+        assert d["name"] == "admin"
+
+    def test_nullable_none_included(self):
+        """None on a nullable column with no default is kept (explicit NULL)."""
+        instance = User(id=uuid.uuid4(), username="u", email="e@e.com", role_id=None)
+        d = _instance_to_dict(instance)
+        assert "role_id" in d
+        assert d["role_id"] is None
+
+    def test_nullable_str_no_default_omitted_not_in_dict(self):
+        """Mapped[str | None] with no default, not provided in constructor, is absent from dict."""
+        instance = User(id=uuid.uuid4(), username="u", email="e@e.com")
+        d = _instance_to_dict(instance)
+        assert "notes" not in d
+
+    def test_nullable_str_no_default_explicit_none_included(self):
+        """Mapped[str | None] with no default, explicitly set to None, is included as NULL."""
+        instance = User(id=uuid.uuid4(), username="u", email="e@e.com", notes=None)
+        d = _instance_to_dict(instance)
+        assert "notes" in d
+        assert d["notes"] is None
+
+    def test_nullable_str_no_default_with_value_included(self):
+        """Mapped[str | None] with no default and a value set is included normally."""
+        instance = User(id=uuid.uuid4(), username="u", email="e@e.com", notes="hello")
+        d = _instance_to_dict(instance)
+        assert d["notes"] == "hello"
+
+    @pytest.mark.anyio
+    async def test_nullable_str_no_default_insert_roundtrip(
+        self, db_session: AsyncSession
+    ):
+        """Fixture loading works for models with Mapped[str | None] (no default).
+
+        Both the omitted-value (→ NULL) and explicit-None paths must insert without error.
+        """
+        registry = FixtureRegistry()
+
+        uid_a = uuid.uuid4()
+        uid_b = uuid.uuid4()
+        uid_c = uuid.uuid4()
+
+        @registry.register
+        def users():
+            return [
+                User(
+                    id=uid_a, username="no_notes", email="a@test.com"
+                ),  # notes omitted
+                User(
+                    id=uid_b, username="null_notes", email="b@test.com", notes=None
+                ),  # explicit None
+                User(
+                    id=uid_c, username="has_notes", email="c@test.com", notes="hi"
+                ),  # value set
+            ]
+
+        result = await load_fixtures(db_session, registry, "users")
+
+        from sqlalchemy import select
+
+        rows = (
+            (await db_session.execute(select(User).order_by(User.username)))
+            .scalars()
+            .all()
+        )
+        by_username = {r.username: r for r in rows}
+
+        assert by_username["no_notes"].notes is None
+        assert by_username["null_notes"].notes is None
+        assert by_username["has_notes"].notes == "hi"
+        assert len(result["users"]) == 3
+
+
+class TestBatchMergeNonPkColumns:
+    """Batch MERGE on a model with no non-PK columns (PK-only table)."""
+
+    @pytest.mark.anyio
+    async def test_merge_pk_only_model(self, db_session: AsyncSession):
+        """MERGE strategy on a PK-only model uses on_conflict_do_nothing."""
+        registry = FixtureRegistry()
+
+        @registry.register
+        def permissions():
+            return [
+                Permission(subject="post", action="read"),
+                Permission(subject="post", action="write"),
+            ]
+
+        result = await load_fixtures(
+            db_session, registry, "permissions", strategy=LoadStrategy.MERGE
+        )
+        assert len(result["permissions"]) == 2
+
+        # Run again — conflicts are silently ignored.
+        result2 = await load_fixtures(
+            db_session, registry, "permissions", strategy=LoadStrategy.MERGE
+        )
+        assert len(result2["permissions"]) == 2
+
+
+class TestBatchNullableColumnEdgeCases:
+    """Deep tests for nullable column handling during batch import."""
+
+    @pytest.mark.anyio
+    async def test_insert_batch_mixed_nullable_fk(self, db_session: AsyncSession):
+        """INSERT batch where some rows set a nullable FK and others don't.
+
+        After normalization the omitted role_id becomes None.  For INSERT this
+        is acceptable — both rows should insert successfully with the correct
+        values (one with FK, one with NULL).
+        """
+        registry = FixtureRegistry()
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        uid1 = uuid.uuid4()
+        uid2 = uuid.uuid4()
+
+        @registry.register
+        def users():
+            return [
+                User(
+                    id=uid1, username="with_role", email="a@test.com", role_id=admin.id
+                ),
+                User(id=uid2, username="no_role", email="b@test.com"),
+            ]
+
+        await load_fixtures(db_session, registry, "users", strategy=LoadStrategy.INSERT)
+
+        from sqlalchemy import select
+
+        rows = {
+            r.username: r
+            for r in (await db_session.execute(select(User))).scalars().all()
+        }
+        assert rows["with_role"].role_id == admin.id
+        assert rows["no_role"].role_id is None
+
+    @pytest.mark.anyio
+    async def test_insert_batch_mixed_nullable_notes(self, db_session: AsyncSession):
+        """INSERT batch where some rows have notes and others don't.
+
+        Ensures normalization doesn't break the insert and that each row gets
+        the intended value.
+        """
+        registry = FixtureRegistry()
+        uid1 = uuid.uuid4()
+        uid2 = uuid.uuid4()
+        uid3 = uuid.uuid4()
+
+        @registry.register
+        def users():
+            return [
+                User(
+                    id=uid1,
+                    username="has_notes",
+                    email="a@test.com",
+                    notes="important",
+                ),
+                User(id=uid2, username="no_notes", email="b@test.com"),
+                User(id=uid3, username="null_notes", email="c@test.com", notes=None),
+            ]
+
+        await load_fixtures(db_session, registry, "users", strategy=LoadStrategy.INSERT)
+
+        from sqlalchemy import select
+
+        rows = {
+            r.username: r
+            for r in (await db_session.execute(select(User))).scalars().all()
+        }
+        assert rows["has_notes"].notes == "important"
+        assert rows["no_notes"].notes is None
+        assert rows["null_notes"].notes is None
+
+    @pytest.mark.anyio
+    async def test_merge_batch_mixed_nullable_does_not_overwrite(
+        self, db_session: AsyncSession
+    ):
+        """MERGE batch where one row sets a nullable column and another omits it.
+
+        If both rows already exist in DB, the row that omits the column must
+        NOT have its existing value overwritten with NULL.
+
+        This is the core normalization bug: _normalize_rows fills missing keys
+        with None, and then MERGE's SET clause includes that column for ALL rows.
+        """
+        from sqlalchemy import select
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        uid1 = uuid.uuid4()
+        uid2 = uuid.uuid4()
+
+        # Pre-populate: both users have role_id and notes
+        registry_initial = FixtureRegistry()
+
+        @registry_initial.register
+        def users():
+            return [
+                User(
+                    id=uid1,
+                    username="alice",
+                    email="a@test.com",
+                    role_id=admin.id,
+                    notes="alice notes",
+                ),
+                User(
+                    id=uid2,
+                    username="bob",
+                    email="b@test.com",
+                    role_id=admin.id,
+                    notes="bob notes",
+                ),
+            ]
+
+        await load_fixtures(
+            db_session, registry_initial, "users", strategy=LoadStrategy.INSERT
+        )
+
+        # Re-merge: alice updates notes, bob omits notes entirely
+        registry_merge = FixtureRegistry()
+
+        @registry_merge.register
+        def users():  # noqa: F811
+            return [
+                User(
+                    id=uid1,
+                    username="alice",
+                    email="a@test.com",
+                    role_id=admin.id,
+                    notes="updated",
+                ),
+                User(
+                    id=uid2,
+                    username="bob",
+                    email="b@test.com",
+                    role_id=admin.id,
+                ),  # notes omitted
+            ]
+
+        await load_fixtures(
+            db_session, registry_merge, "users", strategy=LoadStrategy.MERGE
+        )
+
+        rows = {
+            r.username: r
+            for r in (await db_session.execute(select(User))).scalars().all()
+        }
+        assert rows["alice"].notes == "updated"
+        # Bob's notes must be preserved, NOT overwritten with NULL
+        assert rows["bob"].notes == "bob notes"
+
+    @pytest.mark.anyio
+    async def test_merge_batch_mixed_nullable_fk_preserves_existing(
+        self, db_session: AsyncSession
+    ):
+        """MERGE batch where one row sets role_id and another omits it.
+
+        The row that omits role_id must keep its existing DB value.
+        """
+        from sqlalchemy import select
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        editor = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+        uid1 = uuid.uuid4()
+        uid2 = uuid.uuid4()
+
+        # Pre-populate
+        registry_initial = FixtureRegistry()
+
+        @registry_initial.register
+        def users():
+            return [
+                User(
+                    id=uid1,
+                    username="alice",
+                    email="a@test.com",
+                    role_id=admin.id,
+                ),
+                User(
+                    id=uid2,
+                    username="bob",
+                    email="b@test.com",
+                    role_id=editor.id,
+                ),
+            ]
+
+        await load_fixtures(
+            db_session, registry_initial, "users", strategy=LoadStrategy.INSERT
+        )
+
+        # Re-merge: alice changes role, bob omits role_id
+        registry_merge = FixtureRegistry()
+
+        @registry_merge.register
+        def users():  # noqa: F811
+            return [
+                User(
+                    id=uid1,
+                    username="alice",
+                    email="a@test.com",
+                    role_id=editor.id,
+                ),
+                User(id=uid2, username="bob", email="b@test.com"),  # role_id omitted
+            ]
+
+        await load_fixtures(
+            db_session, registry_merge, "users", strategy=LoadStrategy.MERGE
+        )
+
+        rows = {
+            r.username: r
+            for r in (await db_session.execute(select(User))).scalars().all()
+        }
+        assert rows["alice"].role_id == editor.id  # updated
+        assert rows["bob"].role_id == editor.id  # must be preserved, NOT NULL
+
+    @pytest.mark.anyio
+    async def test_insert_batch_mixed_pk_presence(self, db_session: AsyncSession):
+        """INSERT batch where some rows have explicit PK and others rely on
+        the callable default (uuid.uuid4).
+
+        Normalization adds the PK key with None to rows that omitted it,
+        which can cause NOT NULL violations on the PK column.
+        """
+        registry = FixtureRegistry()
+        explicit_id = uuid.uuid4()
+
+        @registry.register
+        def roles():
+            return [
+                Role(id=explicit_id, name="admin"),
+                Role(name="user"),  # PK omitted, relies on default=uuid.uuid4
+            ]
+
+        await load_fixtures(db_session, registry, "roles", strategy=LoadStrategy.INSERT)
+
+        from sqlalchemy import select
+
+        rows = (await db_session.execute(select(Role))).scalars().all()
+        assert len(rows) == 2
+        names = {r.name for r in rows}
+        assert names == {"admin", "user"}
+        # The "admin" row must have the explicit ID
+        admin = next(r for r in rows if r.name == "admin")
+        assert admin.id == explicit_id
+        # The "user" row must have a generated UUID (not None)
+        user = next(r for r in rows if r.name == "user")
+        assert user.id is not None
+
+    @pytest.mark.anyio
+    async def test_skip_existing_batch_mixed_nullable(self, db_session: AsyncSession):
+        """SKIP_EXISTING with mixed nullable columns inserts correctly.
+
+        Only new rows are inserted; existing rows are untouched regardless of
+        which columns the fixture provides.
+        """
+        from sqlalchemy import select
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        uid1 = uuid.uuid4()
+        uid2 = uuid.uuid4()
+
+        # Pre-populate uid1 with notes
+        registry_initial = FixtureRegistry()
+
+        @registry_initial.register
+        def users():
+            return [
+                User(
+                    id=uid1,
+                    username="alice",
+                    email="a@test.com",
+                    role_id=admin.id,
+                    notes="keep me",
+                ),
+            ]
+
+        await load_fixtures(
+            db_session, registry_initial, "users", strategy=LoadStrategy.INSERT
+        )
+
+        # Load again with SKIP_EXISTING: uid1 already exists, uid2 is new
+        registry_skip = FixtureRegistry()
+
+        @registry_skip.register
+        def users():  # noqa: F811
+            return [
+                User(id=uid1, username="alice-updated", email="a@test.com"),  # exists
+                User(
+                    id=uid2,
+                    username="bob",
+                    email="b@test.com",
+                    notes="new user",
+                ),  # new
+            ]
+
+        result = await load_fixtures(
+            db_session, registry_skip, "users", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert len(result["users"]) == 1  # only bob inserted
+
+        rows = {
+            r.username: r
+            for r in (await db_session.execute(select(User))).scalars().all()
+        }
+        # alice untouched
+        assert rows["alice"].role_id == admin.id
+        assert rows["alice"].notes == "keep me"
+        # bob inserted correctly
+        assert rows["bob"].notes == "new user"
+
+    @pytest.mark.anyio
+    async def test_insert_batch_every_row_different_nullable_columns(
+        self, db_session: AsyncSession
+    ):
+        """Each row in the batch sets a different combination of nullable columns.
+
+        Tests that normalization produces valid SQL for all rows.
+        """
+        registry = FixtureRegistry()
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        uid1 = uuid.uuid4()
+        uid2 = uuid.uuid4()
+        uid3 = uuid.uuid4()
+
+        @registry.register
+        def users():
+            return [
+                User(
+                    id=uid1,
+                    username="all_set",
+                    email="a@test.com",
+                    role_id=admin.id,
+                    notes="full",
+                ),
+                User(
+                    id=uid2, username="only_role", email="b@test.com", role_id=admin.id
+                ),
+                User(
+                    id=uid3, username="only_notes", email="c@test.com", notes="partial"
+                ),
+            ]
+
+        await load_fixtures(db_session, registry, "users", strategy=LoadStrategy.INSERT)
+
+        from sqlalchemy import select
+
+        rows = {
+            r.username: r
+            for r in (await db_session.execute(select(User))).scalars().all()
+        }
+        assert rows["all_set"].role_id == admin.id
+        assert rows["all_set"].notes == "full"
+        assert rows["only_role"].role_id == admin.id
+        assert rows["only_role"].notes is None
+        assert rows["only_notes"].role_id is None
+        assert rows["only_notes"].notes == "partial"

tests/test_pytest.py

@@ -7,9 +7,10 @@ from fastapi import Depends, FastAPI
 from httpx import AsyncClient
 from sqlalchemy import select, text
 from sqlalchemy.engine import make_url
-from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 from sqlalchemy.orm import selectinload
 
+from fastapi_toolsets.db import get_transaction
 from fastapi_toolsets.fixtures import Context, FixtureRegistry
 from fastapi_toolsets.pytest import (
     create_async_client,
@@ -336,6 +337,42 @@ class TestCreateDbSession:
             result = await session.execute(select(Role))
             assert result.all() == []
 
+    @pytest.mark.anyio
+    async def test_get_transaction_commits_visible_to_separate_session(self):
+        """Data written via get_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 get_transaction
+            # with no explicit commit afterward.
+            async with get_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 get_transaction() must be committed "
+                        "and visible to a separate session. If create_db_session uses "
+                        "create_db_context, auto-begin forces get_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."""

uv.lock

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+version = "0.135.3"
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 [[package]]
 name = "fastapi-toolsets"
-version = "2.4.3"
+version = "3.0.3"
 source = { editable = "." }
 dependencies = [
     { name = "asyncpg" },
@@ -285,6 +285,7 @@ dev = [
     { name = "coverage" },
     { name = "fastapi-toolsets", extra = ["all"] },
     { name = "httpx" },
+    { name = "mike" },
     { name = "mkdocstrings-python" },
     { name = "prek" },
     { name = "pytest" },
@@ -296,6 +297,7 @@ dev = [
     { name = "zensical" },
 ]
 docs = [
+    { name = "mike" },
     { name = "mkdocstrings-python" },
     { name = "zensical" },
 ]
@@ -328,6 +330,7 @@ dev = [
     { name = "coverage", specifier = ">=7.0.0" },
     { name = "fastapi-toolsets", extras = ["all"] },
     { name = "httpx", specifier = ">=0.25.0" },
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     { name = "pytest", specifier = ">=8.0.0" },
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+    { name = "zensical", specifier = ">=0.0.30" },
 ]
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+    { name = "mike", git = "https://github.com/squidfunk/mike.git?tag=2.2.0%2Bzensical-0.1.0" },
     { name = "mkdocstrings-python", specifier = ">=2.0.2" },
-    { name = "zensical", specifier = ">=0.0.23" },
+    { name = "zensical", specifier = ">=0.0.30" },
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+version = "2.2.0+zensical.0.1.0"
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+    { name = "verspec" },
+    { name = "zensical" },
+]
+
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 name = "mkdocs"
 version = "1.6.1"
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 [[package]]
 name = "watchdog"
 version = "6.0.0"
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 [[package]]
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 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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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 +145,7 @@ Examples = [
 
 [[project.nav]]
 Migration = [
+    {"v3.0" = "migration/v3.md"},
     {"v2.0" = "migration/v2.md"},
 ]