tests: close generator instead of session in test_get_db_yields_async_session

* ⬆ Bump ty from 0.0.23 to 0.0.25

Bumps [ty](https://github.com/astral-sh/ty) from 0.0.23 to 0.0.25.
- [Release notes](https://github.com/astral-sh/ty/releases)
- [Changelog](https://github.com/astral-sh/ty/blob/main/CHANGELOG.md)
- [Commits](https://github.com/astral-sh/ty/compare/0.0.23...0.0.25)

---
updated-dependencies:
- dependency-name: ty
  dependency-version: 0.0.25
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

* fix: ty warnings

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: d3vyce <nicolas.sudres@proton.me>

.github/workflows/docs.yml

@@ -34,5 +34,5 @@ jobs:
         with:
           path: site
 
-      - uses: actions/deploy-pages@v4
+      - uses: actions/deploy-pages@v5
         id: deployment

.pre-commit-config.yaml

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

docs/examples/pagination-search.md

@@ -72,6 +72,7 @@ GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&or
   ],
   "pagination": {
     "total_count": 42,
+    "pages": 5,
     "page": 2,
     "items_per_page": 10,
     "has_more": true
@@ -85,6 +86,8 @@ GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&or
 
 `filter_attributes` always reflects the values visible **after** applying the active filters. Use it to populate filter dropdowns on the client.
 
+To skip the `COUNT(*)` query for better performance on large tables, pass `include_total=False`. `pagination.total_count` will be `null` in the response, while `has_more` remains accurate.
+
 ### Cursor pagination
 
 Best for feeds, infinite scroll, or any high-throughput API where offset performance degrades.
@@ -144,7 +147,7 @@ GET /articles/?pagination_type=offset&page=1&items_per_page=10
   "status": "SUCCESS",
   "pagination_type": "offset",
   "data": ["..."],
-  "pagination": { "total_count": 42, "page": 1, "items_per_page": 10, "has_more": true }
+  "pagination": { "total_count": 42, "pages": 5, "page": 1, "items_per_page": 10, "has_more": true }
 }
 ```
 

docs/module/crud.md

@@ -182,6 +182,7 @@ The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.Async
   "data": ["..."],
   "pagination": {
     "total_count": 100,
+    "pages": 5,
     "page": 1,
     "items_per_page": 20,
     "has_more": true
@@ -189,6 +190,40 @@ The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.Async
 }
 ```
 
+#### Skipping the COUNT query
+
+!!! info "Added in `v2.4.1`"
+
+By default `offset_paginate` runs two queries: one for the page items and one `COUNT(*)` for `total_count`. On large tables the `COUNT` can be expensive. Pass `include_total=False` to 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(
+    session: SessionDep,
+    params: Annotated[dict, Depends(UserCrud.offset_params(default_page_size=20, max_page_size=100))],
+) -> OffsetPaginatedResponse[UserRead]:
+    return await UserCrud.offset_paginate(session=session, **params, schema=UserRead)
+```
+
 ### Cursor pagination
 
 ```python
@@ -238,7 +273,7 @@ The cursor column is set once on [`CrudFactory`](../reference/crud.md#fastapi_to
 !!! note
     `cursor_column` is required. Calling [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate) on a CRUD class that has no `cursor_column` configured raises a `ValueError`.
 
-The cursor value is base64-encoded when returned to the client and decoded back to the correct Python type on the next request. The following SQLAlchemy column types are supported:
+The cursor value is URL-safe base64-encoded (no padding) when returned to the client and decoded back to the correct Python type on the next request. The following SQLAlchemy column types are supported:
 
 | SQLAlchemy type | Python type |
 |---|---|
@@ -256,6 +291,24 @@ 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`"
@@ -289,7 +342,24 @@ GET /users?pagination_type=offset&page=2&items_per_page=10
 GET /users?pagination_type=cursor&cursor=eyJ2YWx1ZSI6...&items_per_page=10
 ```
 
-Both `page` and `cursor` are always accepted by the endpoint — unused parameters are silently ignored by `paginate()`.
+#### 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
 

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.MERGE` | Insert or update on conflict (default) |
-| `LoadStrategy.SKIP` | Skip rows that already exist |
+| `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

@@ -138,6 +138,23 @@ Server-side defaults (e.g. `id`, `created_at`) are fully populated in all callba
 | `@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:
+
+```python
+@watch("status")
+class Order(Base, UUIDMixin, WatchedFieldsMixin):
+    ...
+
+class UrgentOrder(Order):
+    # inherits @watch("status") — on_update fires only for status changes
+    ...
+
+@watch("priority")
+class PriorityOrder(Order):
+    # overrides parent — on_update fires only for priority changes
+    ...
+```
+
 #### Option 1 — catch-all with `on_event`
 
 Override `on_event` to handle all event types in one place. The specific methods delegate here by default:
@@ -197,6 +214,25 @@ The `changes` dict maps each watched field that changed to `{"old": ..., "new":
 
 !!! 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.

docs_src/examples/pagination_search/routes.py

@@ -1,8 +1,8 @@
 from typing import Annotated
 
-from fastapi import APIRouter, Depends, Query
+from fastapi import APIRouter, Depends
 
-from fastapi_toolsets.crud import OrderByClause, PaginationType
+from fastapi_toolsets.crud import OrderByClause
 from fastapi_toolsets.schemas import (
     CursorPaginatedResponse,
     OffsetPaginatedResponse,
@@ -20,19 +20,20 @@ router = APIRouter(prefix="/articles")
 @router.get("/offset")
 async def list_articles_offset(
     session: SessionDep,
+    params: Annotated[
+        dict,
+        Depends(ArticleCrud.offset_params(default_page_size=20, max_page_size=100)),
+    ],
     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)),
     ],
-    page: int = Query(1, ge=1),
-    items_per_page: int = Query(20, ge=1, le=100),
     search: str | None = None,
 ) -> OffsetPaginatedResponse[ArticleRead]:
     return await ArticleCrud.offset_paginate(
         session=session,
-        page=page,
+        **params,
-        items_per_page=items_per_page,
         search=search,
         filter_by=filter_by or None,
         order_by=order_by,
@@ -43,19 +44,20 @@ async def list_articles_offset(
 @router.get("/cursor")
 async def list_articles_cursor(
     session: SessionDep,
+    params: Annotated[
+        dict,
+        Depends(ArticleCrud.cursor_params(default_page_size=20, max_page_size=100)),
+    ],
     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)),
     ],
-    cursor: str | None = None,
-    items_per_page: int = Query(20, ge=1, le=100),
     search: str | None = None,
 ) -> CursorPaginatedResponse[ArticleRead]:
     return await ArticleCrud.cursor_paginate(
         session=session,
-        cursor=cursor,
+        **params,
-        items_per_page=items_per_page,
         search=search,
         filter_by=filter_by or None,
         order_by=order_by,
@@ -66,23 +68,20 @@ async def list_articles_cursor(
 @router.get("/")
 async def list_articles(
     session: SessionDep,
+    params: Annotated[
+        dict,
+        Depends(ArticleCrud.paginate_params(default_page_size=20, max_page_size=100)),
+    ],
     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)),
     ],
-    pagination_type: PaginationType = PaginationType.OFFSET,
-    page: int = Query(1, ge=1),
-    cursor: str | None = None,
-    items_per_page: int = Query(20, ge=1, le=100),
     search: str | None = None,
 ) -> PaginatedResponse[ArticleRead]:
     return await ArticleCrud.paginate(
         session,
-        pagination_type=pagination_type,
+        **params,
-        page=page,
-        cursor=cursor,
-        items_per_page=items_per_page,
         search=search,
         filter_by=filter_by or None,
         order_by=order_by,

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "fastapi-toolsets"
-version = "2.4.0"
+version = "2.4.3"
 description = "Production-ready utilities for FastAPI applications"
 readme = "README.md"
 license = "MIT"
@@ -67,6 +67,7 @@ dev = [
     {include-group = "tests"},
     {include-group = "docs"},
     "fastapi-toolsets[all]",
+    "prek>=0.3.8",
     "ruff>=0.1.0",
     "ty>=0.0.1a0",
 ]
@@ -84,7 +85,7 @@ docs = [
 ]
 
 [build-system]
-requires = ["uv_build>=0.10,<0.11.0"]
+requires = ["uv_build>=0.10,<0.12.0"]
 build-backend = "uv_build"
 
 [tool.pytest.ini_options]

src/fastapi_toolsets/__init__.py

@@ -21,4 +21,4 @@ Example usage:
         return Response(data={"user": user.username}, message="Success")
 """
 
-__version__ = "2.4.0"
+__version__ = "2.4.3"

src/fastapi_toolsets/crud/factory.py

@@ -58,18 +58,33 @@ class _CursorDirection(str, Enum):
 def _encode_cursor(
     value: Any, *, direction: _CursorDirection = _CursorDirection.NEXT
 ) -> str:
-    """Encode a cursor column value and navigation direction as a base64 string."""
+    """Encode a cursor column value and navigation direction as a URL-safe base64 string."""
-    return base64.b64encode(
+    return (
+        base64.urlsafe_b64encode(
             json.dumps({"val": str(value), "dir": direction}).encode()
-    ).decode()
+        )
+        .decode()
+        .rstrip("=")
+    )
 
 
 def _decode_cursor(cursor: str) -> tuple[str, _CursorDirection]:
-    """Decode a cursor base64 string into ``(raw_value, direction)``."""
+    """Decode a URL-safe base64 cursor string into ``(raw_value, direction)``."""
-    payload = json.loads(base64.b64decode(cursor.encode()).decode())
+    padded = cursor + "=" * (-len(cursor) % 4)
+    payload = json.loads(base64.urlsafe_b64decode(padded).decode())
     return payload["val"], _CursorDirection(payload["dir"])
 
 
+def _page_size_query(default: int, max_size: int) -> int:
+    """Return a FastAPI ``Query`` for the ``items_per_page`` parameter."""
+    return Query(
+        default,
+        ge=1,
+        le=max_size,
+        description=f"Number of items per page (max {max_size})",
+    )
+
+
 def _parse_cursor_value(raw_val: str, col_type: Any) -> Any:
     """Parse a raw cursor string value back into the appropriate Python type."""
     if isinstance(col_type, Integer):
@@ -254,6 +269,7 @@ class AsyncCrud(Generic[ModelType]):
         facet_fields: Sequence[FacetFieldType] | None = None,
     ) -> Callable[..., Awaitable[dict[str, list[str]]]]:
         """Return a FastAPI dependency that collects facet filter values from query parameters.
+
         Args:
             facet_fields: Override the facet fields for this dependency. Falls back to the
                 class-level ``facet_fields`` if not provided.
@@ -279,7 +295,7 @@ class AsyncCrud(Generic[ModelType]):
             return {k: v for k, v in kwargs.items() if v is not None}
 
         dependency.__name__ = f"{cls.model.__name__}FilterParams"
-        dependency.__signature__ = inspect.Signature(  # type: ignore[attr-defined]
+        dependency.__signature__ = inspect.Signature(  # type: ignore[attr-defined]  # ty:ignore[unresolved-attribute]
             parameters=[
                 inspect.Parameter(
                     k,
@@ -293,6 +309,121 @@ class AsyncCrud(Generic[ModelType]):
 
         return dependency
 
+    @classmethod
+    def offset_params(
+        cls: type[Self],
+        *,
+        default_page_size: int = 20,
+        max_page_size: int = 100,
+        include_total: bool = True,
+    ) -> Callable[..., Awaitable[dict[str, Any]]]:
+        """Return a FastAPI dependency that collects offset pagination params from query params.
+
+        Args:
+            default_page_size: Default value for the ``items_per_page`` query parameter.
+            max_page_size: Maximum allowed value for ``items_per_page`` (enforced via
+                ``le`` on the ``Query``).
+            include_total: Server-side flag forwarded as-is to ``include_total`` in
+                :meth:`offset_paginate`. Not exposed as a query parameter.
+
+        Returns:
+            An async dependency that resolves to a dict with ``page``,
+            ``items_per_page``, and ``include_total`` keys, ready to be
+            unpacked into :meth:`offset_paginate`.
+        """
+
+        async def dependency(
+            page: int = Query(1, ge=1, description="Page number (1-indexed)"),
+            items_per_page: int = _page_size_query(default_page_size, max_page_size),
+        ) -> dict[str, Any]:
+            return {
+                "page": page,
+                "items_per_page": items_per_page,
+                "include_total": include_total,
+            }
+
+        dependency.__name__ = f"{cls.model.__name__}OffsetParams"
+        return dependency
+
+    @classmethod
+    def cursor_params(
+        cls: type[Self],
+        *,
+        default_page_size: int = 20,
+        max_page_size: int = 100,
+    ) -> Callable[..., Awaitable[dict[str, Any]]]:
+        """Return a FastAPI dependency that collects cursor pagination params from query params.
+
+        Args:
+            default_page_size: Default value for the ``items_per_page`` query parameter.
+            max_page_size: Maximum allowed value for ``items_per_page`` (enforced via
+                ``le`` on the ``Query``).
+
+        Returns:
+            An async dependency that resolves to a dict with ``cursor`` and
+            ``items_per_page`` keys, ready to be unpacked into
+            :meth:`cursor_paginate`.
+        """
+
+        async def dependency(
+            cursor: str | None = Query(
+                None, description="Cursor token from a previous response"
+            ),
+            items_per_page: int = _page_size_query(default_page_size, max_page_size),
+        ) -> dict[str, Any]:
+            return {"cursor": cursor, "items_per_page": items_per_page}
+
+        dependency.__name__ = f"{cls.model.__name__}CursorParams"
+        return dependency
+
+    @classmethod
+    def paginate_params(
+        cls: type[Self],
+        *,
+        default_page_size: int = 20,
+        max_page_size: int = 100,
+        default_pagination_type: PaginationType = PaginationType.OFFSET,
+        include_total: bool = True,
+    ) -> Callable[..., Awaitable[dict[str, Any]]]:
+        """Return a FastAPI dependency that collects all pagination params from query params.
+
+        Args:
+            default_page_size: Default value for the ``items_per_page`` query parameter.
+            max_page_size: Maximum allowed value for ``items_per_page`` (enforced via
+                ``le`` on the ``Query``).
+            default_pagination_type: Default pagination strategy.
+            include_total: Server-side flag forwarded as-is to ``include_total`` in
+                :meth:`paginate`. Not exposed as a query parameter.
+
+        Returns:
+            An async dependency that resolves to a dict with ``pagination_type``,
+            ``page``, ``cursor``, ``items_per_page``, and ``include_total`` keys,
+            ready to be unpacked into :meth:`paginate`.
+        """
+
+        async def dependency(
+            pagination_type: PaginationType = Query(
+                default_pagination_type, description="Pagination strategy"
+            ),
+            page: int = Query(
+                1, ge=1, description="Page number (1-indexed, offset only)"
+            ),
+            cursor: str | None = Query(
+                None, description="Cursor token from a previous response (cursor only)"
+            ),
+            items_per_page: int = _page_size_query(default_page_size, max_page_size),
+        ) -> dict[str, Any]:
+            return {
+                "pagination_type": pagination_type,
+                "page": page,
+                "cursor": cursor,
+                "items_per_page": items_per_page,
+                "include_total": include_total,
+            }
+
+        dependency.__name__ = f"{cls.model.__name__}PaginateParams"
+        return dependency
+
     @classmethod
     def order_params(
         cls: type[Self],
@@ -922,6 +1053,7 @@ class AsyncCrud(Generic[ModelType]):
         order_by: OrderByClause | None = None,
         page: int = 1,
         items_per_page: int = 20,
+        include_total: bool = True,
         search: str | SearchConfig | None = None,
         search_fields: Sequence[SearchFieldType] | None = None,
         facet_fields: Sequence[FacetFieldType] | None = None,
@@ -939,6 +1071,8 @@ class AsyncCrud(Generic[ModelType]):
             order_by: Column or list of columns to order by
             page: Page number (1-indexed)
             items_per_page: Number of items per page
+            include_total: When ``False``, skip the ``COUNT`` query;
+                ``pagination.total_count`` will be ``None``.
             search: Search query string or SearchConfig object
             search_fields: Fields to search in (overrides class default)
             facet_fields: Columns to compute distinct values for (overrides class default)
@@ -983,10 +1117,10 @@ class AsyncCrud(Generic[ModelType]):
         if order_by is not None:
             q = q.order_by(order_by)
 
+        if include_total:
             q = q.offset(offset).limit(items_per_page)
             result = await session.execute(q)
             raw_items = cast(list[ModelType], result.unique().scalars().all())
-        items: list[Any] = [schema.model_validate(item) for item in raw_items]
 
             # Count query (with same joins and filters)
             pk_col = cls.model.__mapper__.primary_key[0]
@@ -1003,7 +1137,18 @@ class AsyncCrud(Generic[ModelType]):
                 count_q = count_q.where(and_(*filters))
 
             count_result = await session.execute(count_q)
-        total_count = count_result.scalar_one()
+            total_count: int | None = count_result.scalar_one()
+            has_more = page * items_per_page < total_count
+        else:
+            # Fetch one extra row to detect if a next page exists without COUNT
+            q = q.offset(offset).limit(items_per_page + 1)
+            result = await session.execute(q)
+            raw_items = cast(list[ModelType], result.unique().scalars().all())
+            has_more = len(raw_items) > items_per_page
+            raw_items = raw_items[:items_per_page]
+            total_count = None
+
+        items: list[Any] = [schema.model_validate(item) for item in raw_items]
 
         filter_attributes = await cls._build_filter_attributes(
             session, facet_fields, filters, search_joins
@@ -1015,7 +1160,7 @@ class AsyncCrud(Generic[ModelType]):
                 total_count=total_count,
                 items_per_page=items_per_page,
                 page=page,
-                has_more=page * items_per_page < total_count,
+                has_more=has_more,
             ),
             filter_attributes=filter_attributes,
         )
@@ -1190,6 +1335,7 @@ class AsyncCrud(Generic[ModelType]):
         page: int = ...,
         cursor: str | None = ...,
         items_per_page: int = ...,
+        include_total: bool = ...,
         search: str | SearchConfig | None = ...,
         search_fields: Sequence[SearchFieldType] | None = ...,
         facet_fields: Sequence[FacetFieldType] | None = ...,
@@ -1212,6 +1358,7 @@ class AsyncCrud(Generic[ModelType]):
         page: int = ...,
         cursor: str | None = ...,
         items_per_page: int = ...,
+        include_total: bool = ...,
         search: str | SearchConfig | None = ...,
         search_fields: Sequence[SearchFieldType] | None = ...,
         facet_fields: Sequence[FacetFieldType] | None = ...,
@@ -1233,6 +1380,7 @@ class AsyncCrud(Generic[ModelType]):
         page: int = 1,
         cursor: str | None = None,
         items_per_page: int = 20,
+        include_total: bool = True,
         search: str | SearchConfig | None = None,
         search_fields: Sequence[SearchFieldType] | None = None,
         facet_fields: Sequence[FacetFieldType] | None = None,
@@ -1258,6 +1406,8 @@ class AsyncCrud(Generic[ModelType]):
                 :class:`.CursorPaginatedResponse`.  Only used when
                 ``pagination_type`` is ``CURSOR``.
             items_per_page: Number of items per page (default 20).
+            include_total: When ``False``, skip the ``COUNT`` query;
+                only applies when ``pagination_type`` is ``OFFSET``.
             search: Search query string or :class:`.SearchConfig` object.
             search_fields: Fields to search in (overrides class default).
             facet_fields: Columns to compute distinct values for (overrides
@@ -1304,6 +1454,7 @@ class AsyncCrud(Generic[ModelType]):
                     order_by=order_by,
                     page=page,
                     items_per_page=items_per_page,
+                    include_total=include_total,
                     search=search,
                     search_fields=search_fields,
                     facet_fields=facet_fields,

src/fastapi_toolsets/db.py

@@ -56,6 +56,7 @@ def create_db_dependency(
 
     async def get_db() -> AsyncGenerator[AsyncSession, None]:
         async with session_maker() as session:
+            await session.connection()
             yield session
             if session.in_transaction():
                 await session.commit()

src/fastapi_toolsets/exceptions/handler.py

@@ -30,7 +30,7 @@ def init_exceptions_handlers(app: FastAPI) -> FastAPI:
     """
     _register_exception_handlers(app)
     _original_openapi = app.openapi
-    app.openapi = lambda: _patched_openapi(app, _original_openapi)  # type: ignore[method-assign]
+    app.openapi = lambda: _patched_openapi(app, _original_openapi)  # type: ignore[method-assign]  # ty:ignore[invalid-assignment]
     return app
 
 

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."""
@@ -50,17 +58,42 @@ 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]
+            _normalize_contexts(contexts) if contexts else None
-            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(
@@ -69,7 +102,7 @@ class FixtureRegistry:
         *,
         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(
@@ -98,20 +131,21 @@ class FixtureRegistry:
         ) -> Callable[[], Sequence[DeclarativeBase]]:
             fixture_name = name or cast(Any, fn).__name__
             if contexts is not None:
-                fixture_contexts = [
+                fixture_contexts = _normalize_contexts(contexts)
-                    c.value if isinstance(c, Context) else c for c in contexts
-                ]
             elif self._default_contexts is not None:
                 fixture_contexts = self._default_contexts
             else:
                 fixture_contexts = [Context.BASE.value]
 
-            self._fixtures[fixture_name] = Fixture(
+            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
 
         if func is not None:
@@ -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():
+        for name, variants in registry._fixtures.items():
-            if name in self._fixtures:
+            for fixture in variants:
-                raise ValueError(
+                self._validate_no_context_overlap(name, fixture.contexts)
-                    f"Fixture '{name}' already exists in the current registry"
+                self._fixtures.setdefault(name, []).append(fixture)
-                )
-            self._fixtures[name] = 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."""
+        """Get all registered fixtures (all variants of all names)."""
-        return list(self._fixtures.values())
+        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}
+        context_values = set(_normalize_contexts(contexts))
-        return [f for f in self._fixtures.values() if set(f.contexts) & context_values]
+        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 +13,152 @@ 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
+            ):
+                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())
+
+
+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]
+    await session.execute(pg_insert(model_cls).values(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]
+    stmt = pg_insert(model_cls).values(dicts)
+
+    if non_pk_cols:
+        stmt = stmt.on_conflict_do_update(
+            index_elements=pk_names,
+            set_={col: stmt.excluded[col] for col in non_pk_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:
+        await session.execute(
+            pg_insert(model_cls).values([_instance_to_dict(i) for i in no_pk])
+        )
+
+    if with_pk_pairs:
+        with_pk = [i for i, _ in with_pk_pairs]
+        stmt = (
+            pg_insert(model_cls)
+            .values([_instance_to_dict(i) for i in with_pk])
+            .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 with_pk_pairs 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.
+
+    When *contexts* is provided only variants whose context set intersects with
+    *contexts* are called for each name; their instances are concatenated.
+    When *contexts* is ``None`` all variants of each name are loaded.
+    """
     results: dict[str, list[DeclarativeBase]] = {}
 
     for name in ordered_names:
-        fixture = registry.get(name)
+        variants = (
-        instances = list(fixture.func())
+            registry.get_variants(name, *contexts)
+            if contexts is not None
+            else registry.get_variants(name)
+        )
+
+        # Cross-context dependency fallback: if we're loading by context but
+        # no variant matches (e.g. a "base"-only fixture required by a
+        # "testing" fixture), load all available variants so the dependency
+        # is satisfied.
+        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 +168,17 @@ async def _load_ordered(
         loaded: list[DeclarativeBase] = []
 
         async with get_transaction(session):
-            for instance in instances:
+            for model_cls, group in _group_by_type(instances):
-                if strategy == LoadStrategy.INSERT:
+                match strategy:
-                    session.add(instance)
+                    case LoadStrategy.INSERT:
-                    loaded.append(instance)
+                        await _batch_insert(session, model_cls, group)
-
+                        loaded.extend(group)
-                elif strategy == LoadStrategy.MERGE:
+                    case LoadStrategy.MERGE:
-                    merged = await session.merge(instance)
+                        await _batch_merge(session, model_cls, group)
-                    loaded.append(merged)
+                        loaded.extend(group)
-
+                    case LoadStrategy.SKIP_EXISTING:
-                else:  # LoadStrategy.SKIP_EXISTING
+                        inserted = await _batch_skip_existing(session, model_cls, group)
-                    pk = _get_primary_key(instance)
+                        loaded.extend(inserted)
-                    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)
 
         results[name] = loaded
         logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
@@ -109,6 +233,8 @@ 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
@@ -125,19 +251,27 @@ 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.
 
+    For each fixture name, only the variants whose context set intersects with
+    *contexts* are loaded.  When a name has variants in multiple of the
+    requested contexts, their instances are merged before being inserted.
+
     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/logger.py

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

src/fastapi_toolsets/models/watched.py

@@ -1,6 +1,7 @@
 """Field-change monitoring via SQLAlchemy session events."""
 
 import asyncio
+import inspect
 import weakref
 from collections.abc import Awaitable
 from enum import Enum
@@ -25,6 +26,7 @@ _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):
@@ -65,6 +67,14 @@ def _snapshot_column_attrs(obj: Any) -> dict[str, Any]:
     }
 
 
+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 _upsert_changes(
     pending: dict[int, tuple[Any, dict[str, dict[str, Any]]]],
     obj: Any,
@@ -83,6 +93,22 @@ 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.
@@ -102,7 +128,7 @@ def _after_flush(session: Any, flush_context: Any) -> None:
             continue
 
         # None = not in dict = watch all fields; list = specific fields only
-        watched = _WATCHED_FIELDS.get(type(obj))
+        watched = _get_watched_fields(type(obj))
         changes: dict[str, dict[str, Any]] = {}
 
         attrs = (
@@ -169,7 +195,7 @@ def _schedule_with_snapshot(
             _sa_set_committed_value(obj, key, value)
         try:
             result = fn(*args)
-            if asyncio.iscoroutine(result):
+            if inspect.isawaitable(result):
                 await result
         except Exception as exc:
             _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
@@ -180,12 +206,24 @@ def _schedule_with_snapshot(
 
 @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
+
     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, {}
     )
 
+    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]
+            field_changes = {
+                k: v for k, v in field_changes.items() if k not in transient_ids
+            }
+
     if not creates and not deletes and not field_changes:
         return
 

src/fastapi_toolsets/pytest/utils.py

@@ -7,6 +7,7 @@ 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,
@@ -15,13 +16,8 @@ from sqlalchemy.ext.asyncio import (
 )
 from sqlalchemy.orm import DeclarativeBase
 
-from sqlalchemy import text
+from ..db import cleanup_tables as _cleanup_tables
-
+from ..db import create_database
-from ..db import (
-    cleanup_tables as _cleanup_tables,
-    create_database,
-    create_db_context,
-)
 
 
 async def cleanup_tables(
@@ -129,7 +125,8 @@ async def create_worker_database(
     worker_url = worker_database_url(
         database_url=database_url, default_test_db=default_test_db
     )
-    worker_db_name: str = make_url(worker_url).database  # type: ignore[assignment]
+    worker_db_name = make_url(worker_url).database
+    assert worker_db_name is not None
 
     engine = create_async_engine(database_url, isolation_level="AUTOCOMMIT")
     try:
@@ -268,15 +265,12 @@ 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 session_maker() as session:
-
-        async with get_session() as session:
             yield session
 
             if cleanup:
-                await cleanup_tables(session, base)
+                await _cleanup_tables(session=session, base=base)
 
         if drop_tables:
             async with engine.begin() as conn:

src/fastapi_toolsets/schemas.py

@@ -1,9 +1,10 @@
 """Base Pydantic schemas for API responses."""
 
+import math
 from enum import Enum
 from typing import Annotated, Any, ClassVar, Generic, Literal, TypeVar, Union
 
-from pydantic import BaseModel, ConfigDict, Field
+from pydantic import BaseModel, ConfigDict, Field, computed_field
 
 from .types import DataT
 
@@ -98,17 +99,29 @@ class OffsetPagination(PydanticBase):
     """Pagination metadata for offset-based list responses.
 
     Attributes:
-        total_count: Total number of items across all pages
+        total_count: Total number of items across all pages.
+            ``None`` when ``include_total=False``.
         items_per_page: Number of items per page
         page: Current page number (1-indexed)
         has_more: Whether there are more pages
+        pages: Total number of pages
     """
 
-    total_count: int
+    total_count: int | None
     items_per_page: int
     page: int
     has_more: bool
 
+    @computed_field
+    @property
+    def pages(self) -> int | None:
+        """Total number of pages, or ``None`` when ``total_count`` is unknown."""
+        if self.total_count is None:
+            return None
+        if self.items_per_page == 0:
+            return 0
+        return math.ceil(self.total_count / self.items_per_page)
+
 
 class CursorPagination(PydanticBase):
     """Pagination metadata for cursor-based list responses.
@@ -152,18 +165,18 @@ class PaginatedResponse(BaseResponse, Generic[DataT]):
 
     _discriminated_union_cache: ClassVar[dict[Any, Any]] = {}
 
-    def __class_getitem__(  # type: ignore[invalid-method-override]
+    def __class_getitem__(  # ty:ignore[invalid-method-override]
         cls, item: type[Any] | tuple[type[Any], ...]
     ) -> type[Any]:
         if cls is PaginatedResponse and not isinstance(item, TypeVar):
             cached = cls._discriminated_union_cache.get(item)
             if cached is None:
                 cached = Annotated[
-                    Union[CursorPaginatedResponse[item], OffsetPaginatedResponse[item]],  # type: ignore[invalid-type-form]
+                    Union[CursorPaginatedResponse[item], OffsetPaginatedResponse[item]],  # ty:ignore[invalid-type-form]
                     Field(discriminator="pagination_type"),
                 ]
                 cls._discriminated_union_cache[item] = cached
-            return cached  # type: ignore[invalid-return-type]
+            return cached  # ty:ignore[invalid-return-type]
         return super().__class_getitem__(item)
 
 

tests/conftest.py

@@ -321,30 +321,3 @@ async def db_session(engine):
         # Drop tables after test
         async with engine.begin() as conn:
             await conn.run_sync(Base.metadata.drop_all)
-
-
-@pytest.fixture
-def sample_role_data() -> RoleCreate:
-    """Sample role creation data."""
-    return RoleCreate(name="admin")
-
-
-@pytest.fixture
-def sample_user_data() -> UserCreate:
-    """Sample user creation data."""
-    return UserCreate(
-        username="testuser",
-        email="test@example.com",
-        is_active=True,
-    )
-
-
-@pytest.fixture
-def sample_post_data() -> PostCreate:
-    """Sample post creation data."""
-    return PostCreate(
-        title="Test Post",
-        content="Test content",
-        is_published=True,
-        author_id=uuid.uuid4(),
-    )

tests/test_crud.py

@@ -1759,6 +1759,52 @@ class TestSchemaResponse:
         assert result.data[0].username == "pg_user"
         assert not hasattr(result.data[0], "email")
 
+    @pytest.mark.anyio
+    async def test_include_total_false_skips_count(self, db_session: AsyncSession):
+        """offset_paginate with include_total=False returns total_count=None."""
+        from fastapi_toolsets.schemas import OffsetPagination
+
+        for i in range(5):
+            await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
+
+        result = await RoleCrud.offset_paginate(
+            db_session, items_per_page=10, include_total=False, schema=RoleRead
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count is None
+        assert len(result.data) == 5
+        assert result.pagination.has_more is False
+
+    @pytest.mark.anyio
+    async def test_include_total_false_has_more_true(self, db_session: AsyncSession):
+        """offset_paginate with include_total=False sets has_more via extra-row probe."""
+        for i in range(15):
+            await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
+
+        result = await RoleCrud.offset_paginate(
+            db_session, items_per_page=10, include_total=False, schema=RoleRead
+        )
+
+        assert result.pagination.total_count is None
+        assert result.pagination.has_more is True
+        assert len(result.data) == 10
+
+    @pytest.mark.anyio
+    async def test_include_total_false_exact_page_boundary(
+        self, db_session: AsyncSession
+    ):
+        """offset_paginate with include_total=False: has_more=False when items == page size."""
+        for i in range(10):
+            await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
+
+        result = await RoleCrud.offset_paginate(
+            db_session, items_per_page=10, include_total=False, schema=RoleRead
+        )
+
+        assert result.pagination.has_more is False
+        assert len(result.data) == 10
+
 
 class TestCursorPaginate:
     """Tests for cursor-based pagination via cursor_paginate()."""
@@ -2520,4 +2566,21 @@ class TestPaginate:
                 db_session,
                 pagination_type="unknown",
                 schema=RoleRead,
-            )  # type: ignore[no-matching-overload]
+            )  # type: ignore[no-matching-overload]  # ty:ignore[no-matching-overload]
+
+    @pytest.mark.anyio
+    async def test_offset_include_total_false(self, db_session: AsyncSession):
+        """paginate() passes include_total=False through to offset_paginate."""
+        from fastapi_toolsets.schemas import OffsetPagination
+
+        await RoleCrud.create(db_session, RoleCreate(name="admin"))
+
+        result = await RoleCrud.paginate(
+            db_session,
+            pagination_type=PaginationType.OFFSET,
+            include_total=False,
+            schema=RoleRead,
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count is None

tests/test_crud_search.py

@@ -14,12 +14,14 @@ from fastapi_toolsets.crud import (
     get_searchable_fields,
 )
 from fastapi_toolsets.exceptions import InvalidOrderFieldError
-from fastapi_toolsets.schemas import OffsetPagination
+from fastapi_toolsets.schemas import OffsetPagination, PaginationType
 
 from .conftest import (
     Role,
     RoleCreate,
     RoleCrud,
+    RoleCursorCrud,
+    RoleRead,
     User,
     UserCreate,
     UserCrud,
@@ -988,7 +990,7 @@ class TestFilterParamsSchema:
         UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
         dep = UserFacetCrud.filter_params()
 
-        assert dep.__name__ == "UserFilterParams"  # type: ignore[union-attr]
+        assert dep.__name__ == "UserFilterParams"  # type: ignore[union-attr]  # ty:ignore[unresolved-attribute]
 
     @pytest.mark.anyio
     async def test_integration_with_offset_paginate(self, db_session: AsyncSession):
@@ -1193,3 +1195,245 @@ class TestOrderParamsSchema:
 
         assert results[0].username == "alice"
         assert results[1].username == "charlie"
+
+
+class TestOffsetParamsSchema:
+    """Tests for AsyncCrud.offset_params()."""
+
+    def test_returns_page_and_items_per_page_params(self):
+        """Returned dependency has page and items_per_page params only."""
+        dep = RoleCrud.offset_params()
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"page", "items_per_page"}
+
+    def test_dependency_name_includes_model_name(self):
+        """Dependency function is named after the model."""
+        dep = RoleCrud.offset_params()
+        assert getattr(dep, "__name__") == "RoleOffsetParams"
+
+    def test_default_page_size_reflected_in_items_per_page_default(self):
+        """default_page_size is used as the default for items_per_page."""
+        dep = RoleCrud.offset_params(default_page_size=42)
+        sig = inspect.signature(dep)
+        assert sig.parameters["items_per_page"].default.default == 42
+
+    def test_max_page_size_reflected_in_items_per_page_le(self):
+        """max_page_size is used as le constraint on items_per_page."""
+        dep = RoleCrud.offset_params(max_page_size=50)
+        sig = inspect.signature(dep)
+        le = next(
+            m.le
+            for m in sig.parameters["items_per_page"].default.metadata
+            if hasattr(m, "le")
+        )
+        assert le == 50
+
+    def test_include_total_not_a_query_param(self):
+        """include_total is not exposed as a query parameter."""
+        dep = RoleCrud.offset_params()
+        param_names = set(inspect.signature(dep).parameters)
+        assert "include_total" not in param_names
+
+    @pytest.mark.anyio
+    async def test_include_total_true_forwarded_in_result(self):
+        """include_total=True factory arg appears in the resolved dict."""
+        result = await RoleCrud.offset_params(include_total=True)(
+            page=1, items_per_page=10
+        )
+        assert result["include_total"] is True
+
+    @pytest.mark.anyio
+    async def test_include_total_false_forwarded_in_result(self):
+        """include_total=False factory arg appears in the resolved dict."""
+        result = await RoleCrud.offset_params(include_total=False)(
+            page=1, items_per_page=10
+        )
+        assert result["include_total"] is False
+
+    @pytest.mark.anyio
+    async def test_awaiting_dep_returns_dict(self):
+        """Awaiting the dependency returns a dict with page, items_per_page, include_total."""
+        dep = RoleCrud.offset_params(include_total=False)
+        result = await dep(page=2, items_per_page=10)
+        assert result == {"page": 2, "items_per_page": 10, "include_total": False}
+
+    @pytest.mark.anyio
+    async def test_integrates_with_offset_paginate(self, db_session: AsyncSession):
+        """offset_params output can be unpacked directly into offset_paginate."""
+        await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        dep = RoleCrud.offset_params()
+        params = await dep(page=1, items_per_page=10)
+        result = await RoleCrud.offset_paginate(db_session, **params, schema=RoleRead)
+        assert result.pagination.page == 1
+        assert result.pagination.items_per_page == 10
+
+
+class TestCursorParamsSchema:
+    """Tests for AsyncCrud.cursor_params()."""
+
+    def test_returns_cursor_and_items_per_page_params(self):
+        """Returned dependency has cursor and items_per_page params."""
+        dep = RoleCursorCrud.cursor_params()
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"cursor", "items_per_page"}
+
+    def test_dependency_name_includes_model_name(self):
+        """Dependency function is named after the model."""
+        dep = RoleCursorCrud.cursor_params()
+        assert getattr(dep, "__name__") == "RoleCursorParams"
+
+    def test_default_page_size_reflected_in_items_per_page_default(self):
+        """default_page_size is used as the default for items_per_page."""
+        dep = RoleCursorCrud.cursor_params(default_page_size=15)
+        sig = inspect.signature(dep)
+        assert sig.parameters["items_per_page"].default.default == 15
+
+    def test_max_page_size_reflected_in_items_per_page_le(self):
+        """max_page_size is used as le constraint on items_per_page."""
+        dep = RoleCursorCrud.cursor_params(max_page_size=75)
+        sig = inspect.signature(dep)
+        le = next(
+            m.le
+            for m in sig.parameters["items_per_page"].default.metadata
+            if hasattr(m, "le")
+        )
+        assert le == 75
+
+    def test_cursor_defaults_to_none(self):
+        """cursor defaults to None."""
+        dep = RoleCursorCrud.cursor_params()
+        sig = inspect.signature(dep)
+        assert sig.parameters["cursor"].default.default is None
+
+    @pytest.mark.anyio
+    async def test_awaiting_dep_returns_dict(self):
+        """Awaiting the dependency returns a dict with cursor and items_per_page."""
+        dep = RoleCursorCrud.cursor_params()
+        result = await dep(cursor=None, items_per_page=5)
+        assert result == {"cursor": None, "items_per_page": 5}
+
+    @pytest.mark.anyio
+    async def test_integrates_with_cursor_paginate(self, db_session: AsyncSession):
+        """cursor_params output can be unpacked directly into cursor_paginate."""
+        await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        dep = RoleCursorCrud.cursor_params()
+        params = await dep(cursor=None, items_per_page=10)
+        result = await RoleCursorCrud.cursor_paginate(
+            db_session, **params, schema=RoleRead
+        )
+        assert result.pagination.items_per_page == 10
+
+
+class TestPaginateParamsSchema:
+    """Tests for AsyncCrud.paginate_params()."""
+
+    def test_returns_all_params(self):
+        """Returned dependency has pagination_type, page, cursor, items_per_page (no include_total)."""
+        dep = RoleCursorCrud.paginate_params()
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"pagination_type", "page", "cursor", "items_per_page"}
+
+    def test_dependency_name_includes_model_name(self):
+        """Dependency function is named after the model."""
+        dep = RoleCursorCrud.paginate_params()
+        assert getattr(dep, "__name__") == "RolePaginateParams"
+
+    def test_default_pagination_type(self):
+        """default_pagination_type is reflected in pagination_type default."""
+        from fastapi_toolsets.schemas import PaginationType
+
+        dep = RoleCursorCrud.paginate_params(
+            default_pagination_type=PaginationType.CURSOR
+        )
+        sig = inspect.signature(dep)
+        assert (
+            sig.parameters["pagination_type"].default.default == PaginationType.CURSOR
+        )
+
+    def test_default_page_size(self):
+        """default_page_size is reflected in items_per_page default."""
+        dep = RoleCursorCrud.paginate_params(default_page_size=15)
+        sig = inspect.signature(dep)
+        assert sig.parameters["items_per_page"].default.default == 15
+
+    def test_max_page_size_le_constraint(self):
+        """max_page_size is used as le constraint on items_per_page."""
+        dep = RoleCursorCrud.paginate_params(max_page_size=60)
+        sig = inspect.signature(dep)
+        le = next(
+            m.le
+            for m in sig.parameters["items_per_page"].default.metadata
+            if hasattr(m, "le")
+        )
+        assert le == 60
+
+    def test_include_total_not_a_query_param(self):
+        """include_total is not exposed as a query parameter."""
+        dep = RoleCursorCrud.paginate_params()
+        assert "include_total" not in set(inspect.signature(dep).parameters)
+
+    @pytest.mark.anyio
+    async def test_include_total_forwarded_in_result(self):
+        """include_total factory arg appears in the resolved dict."""
+        result_true = await RoleCursorCrud.paginate_params(include_total=True)(
+            pagination_type=PaginationType.OFFSET,
+            page=1,
+            cursor=None,
+            items_per_page=10,
+        )
+        result_false = await RoleCursorCrud.paginate_params(include_total=False)(
+            pagination_type=PaginationType.OFFSET,
+            page=1,
+            cursor=None,
+            items_per_page=10,
+        )
+        assert result_true["include_total"] is True
+        assert result_false["include_total"] is False
+
+    @pytest.mark.anyio
+    async def test_awaiting_dep_returns_dict(self):
+        """Awaiting the dependency returns a dict with all pagination keys."""
+        dep = RoleCursorCrud.paginate_params()
+        result = await dep(
+            pagination_type=PaginationType.OFFSET,
+            page=2,
+            cursor=None,
+            items_per_page=10,
+        )
+        assert result == {
+            "pagination_type": PaginationType.OFFSET,
+            "page": 2,
+            "cursor": None,
+            "items_per_page": 10,
+            "include_total": True,
+        }
+
+    @pytest.mark.anyio
+    async def test_integrates_with_paginate_offset(self, db_session: AsyncSession):
+        """paginate_params output unpacks into paginate() for offset strategy."""
+        from fastapi_toolsets.schemas import OffsetPagination
+
+        await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        params = await RoleCursorCrud.paginate_params()(
+            pagination_type=PaginationType.OFFSET,
+            page=1,
+            cursor=None,
+            items_per_page=10,
+        )
+        result = await RoleCursorCrud.paginate(db_session, **params, schema=RoleRead)
+        assert isinstance(result.pagination, OffsetPagination)
+
+    @pytest.mark.anyio
+    async def test_integrates_with_paginate_cursor(self, db_session: AsyncSession):
+        """paginate_params output unpacks into paginate() for cursor strategy."""
+        from fastapi_toolsets.schemas import CursorPagination
+
+        await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        params = await RoleCursorCrud.paginate_params()(
+            pagination_type=PaginationType.CURSOR,
+            page=1,
+            cursor=None,
+            items_per_page=10,
+        )
+        result = await RoleCursorCrud.paginate(db_session, **params, schema=RoleRead)
+        assert isinstance(result.pagination, CursorPagination)

tests/test_db.py

@@ -68,6 +68,55 @@ class TestCreateDbDependency:
                 await conn.run_sync(Base.metadata.drop_all)
             await engine.dispose()
 
+    @pytest.mark.anyio
+    async def test_in_transaction_on_yield(self):
+        """Session is already in a transaction when the endpoint body starts."""
+        engine = create_async_engine(DATABASE_URL, echo=False)
+        session_factory = async_sessionmaker(engine, expire_on_commit=False)
+        get_db = create_db_dependency(session_factory)
+
+        async for session in get_db():
+            assert session.in_transaction()
+            break
+
+        await engine.dispose()
+
+    @pytest.mark.anyio
+    async def test_update_after_lock_tables_is_persisted(self):
+        """Changes made after lock_tables exits (before endpoint returns) are committed.
+
+        Regression: without the auto-begin fix, lock_tables would start and commit a
+        real outer transaction, leaving the session idle. Any modifications after that
+        point were silently dropped.
+        """
+        engine = create_async_engine(DATABASE_URL, echo=False)
+        session_factory = async_sessionmaker(engine, expire_on_commit=False)
+
+        async with engine.begin() as conn:
+            await conn.run_sync(Base.metadata.create_all)
+
+        try:
+            get_db = create_db_dependency(session_factory)
+
+            async for session in get_db():
+                async with lock_tables(session, [Role]):
+                    role = Role(name="lock_then_update")
+                    session.add(role)
+                    await session.flush()
+                # lock_tables has exited — outer transaction must still be open
+                assert session.in_transaction()
+                role.name = "updated_after_lock"
+
+            async with session_factory() as verify:
+                result = await RoleCrud.first(
+                    verify, [Role.name == "updated_after_lock"]
+                )
+                assert result is not None
+        finally:
+            async with engine.begin() as conn:
+                await conn.run_sync(Base.metadata.drop_all)
+            await engine.dispose()
+
 
 class TestCreateDbContext:
     """Tests for create_db_context."""
@@ -363,7 +412,8 @@ class TestCreateDatabase:
             .set(database="test_create_db_general")
             .render_as_string(hide_password=False)
         )
-        expected_db: str = make_url(target_url).database  # type: ignore[assignment]
+        expected_db = make_url(target_url).database
+        assert expected_db is not None
 
         engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
         try:

tests/test_dependencies.py

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

tests/test_example_pagination_search.py

@@ -10,12 +10,13 @@ import datetime
 import pytest
 from fastapi import FastAPI
 from httpx import ASGITransport, AsyncClient
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.ext.asyncio import AsyncSession
 
 from docs_src.examples.pagination_search.db import get_db
 from docs_src.examples.pagination_search.models import Article, Base, Category
 from docs_src.examples.pagination_search.routes import router
 from fastapi_toolsets.exceptions import init_exceptions_handlers
+from fastapi_toolsets.pytest import create_db_session
 
 from .conftest import DATABASE_URL
 
@@ -35,20 +36,8 @@ def build_app(session: AsyncSession) -> FastAPI:
 @pytest.fixture(scope="function")
 async def ex_db_session():
     """Isolated session for the example models (separate tables from conftest)."""
-    engine = create_async_engine(DATABASE_URL, echo=False)
+    async with create_db_session(DATABASE_URL, Base) as session:
-    async with engine.begin() as conn:
-        await conn.run_sync(Base.metadata.create_all)
-
-    session_factory = async_sessionmaker(engine, expire_on_commit=False)
-    session = session_factory()
-
-    try:
         yield session
-    finally:
-        await session.close()
-        async with engine.begin() as conn:
-            await conn.run_sync(Base.metadata.drop_all)
-        await engine.dispose()
 
 
 @pytest.fixture
@@ -108,7 +97,7 @@ class TestAppSessionDep:
         gen = get_db()
         session = await gen.__anext__()
         assert isinstance(session, AsyncSession)
-        await session.close()
+        await gen.aclose()
 
 
 class TestOffsetPagination:

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
@@ -14,9 +15,22 @@ from fastapi_toolsets.fixtures import (
     load_fixtures_by_context,
 )
 
-from fastapi_toolsets.fixtures.utils import _get_primary_key
+from fastapi_toolsets.fixtures.utils import _get_primary_key, _instance_to_dict
 
-from .conftest import IntRole, Permission, Role, User
+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 +53,86 @@ 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 +501,37 @@ 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()
@@ -447,8 +572,6 @@ class TestLoadFixtures:
         assert "roles" in result
         assert len(result["roles"]) == 2
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 2
 
@@ -479,8 +602,6 @@ class TestLoadFixtures:
         assert "roles" in result
         assert "users" in result
 
-        from .conftest import RoleCrud, UserCrud
-
         assert await RoleCrud.count(db_session) == 1
         assert await UserCrud.count(db_session) == 1
 
@@ -497,8 +618,6 @@ class TestLoadFixtures:
         await load_fixtures(db_session, registry, "roles", strategy=LoadStrategy.MERGE)
         await load_fixtures(db_session, registry, "roles", strategy=LoadStrategy.MERGE)
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 1
 
@@ -526,8 +645,6 @@ class TestLoadFixtures:
             db_session, registry, "roles", strategy=LoadStrategy.SKIP_EXISTING
         )
 
-        from .conftest import RoleCrud
-
         role = await RoleCrud.first(db_session, [Role.id == role_id])
         assert role is not None
         assert role.name == "original"
@@ -553,8 +670,6 @@ class TestLoadFixtures:
         assert "roles" in result
         assert len(result["roles"]) == 2
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 2
 
@@ -594,8 +709,6 @@ class TestLoadFixtures:
         assert "roles" in result
         assert "other_roles" in result
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 2
 
@@ -660,8 +773,6 @@ class TestLoadFixturesByContext:
 
         await load_fixtures_by_context(db_session, registry, Context.BASE)
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 1
 
@@ -688,8 +799,6 @@ class TestLoadFixturesByContext:
             db_session, registry, Context.BASE, Context.TESTING
         )
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 2
 
@@ -717,8 +826,6 @@ class TestLoadFixturesByContext:
 
         await load_fixtures_by_context(db_session, registry, Context.TESTING)
 
-        from .conftest import RoleCrud, UserCrud
-
         assert await RoleCrud.count(db_session) == 1
         assert await UserCrud.count(db_session) == 1
 
@@ -813,3 +920,82 @@ 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_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
+
+
+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

tests/test_imports.py

@@ -101,7 +101,7 @@ class TestMetricsImportGuard:
             with patch("builtins.__import__", side_effect=blocking_import):
                 mod = importlib.import_module("fastapi_toolsets.metrics")
                 with pytest.raises(ImportError, match="prometheus_client"):
-                    mod.init_metrics(None, None)  # type: ignore[arg-type]
+                    mod.init_metrics(None, None)  # type: ignore[arg-type]  # ty:ignore[invalid-argument-type]
         finally:
             for key in list(sys.modules):
                 if key.startswith("fastapi_toolsets.metrics"):
@@ -171,8 +171,15 @@ class TestPytestImportGuard:
 class TestCliImportGuard:
     """Tests for CLI module import guard when typer is missing."""
 
-    def test_import_raises_without_typer(self):
+    @pytest.mark.parametrize(
-        """Importing cli.app raises when typer is missing."""
+        "expected_match",
+        [
+            "typer",
+            r"pip install fastapi-toolsets\[cli\]",
+        ],
+    )
+    def test_import_raises_without_typer(self, expected_match):
+        """Importing cli.app raises when typer is missing, with an informative error message."""
         saved, blocking_import = _reload_without_package(
             "fastapi_toolsets.cli.app", ["typer"]
         )
@@ -186,33 +193,7 @@ class TestCliImportGuard:
 
         try:
             with patch("builtins.__import__", side_effect=blocking_import):
-                with pytest.raises(ImportError, match="typer"):
+                with pytest.raises(ImportError, match=expected_match):
-                    importlib.import_module("fastapi_toolsets.cli.app")
-        finally:
-            for key in list(sys.modules):
-                if key.startswith("fastapi_toolsets.cli.app") or key.startswith(
-                    "fastapi_toolsets.cli.config"
-                ):
-                    sys.modules.pop(key, None)
-            sys.modules.update(saved)
-
-    def test_error_message_suggests_cli_extra(self):
-        """Error message suggests installing the cli extra."""
-        saved, blocking_import = _reload_without_package(
-            "fastapi_toolsets.cli.app", ["typer"]
-        )
-        config_keys = [
-            k for k in sys.modules if k.startswith("fastapi_toolsets.cli.config")
-        ]
-        for key in config_keys:
-            if key not in saved:
-                saved[key] = sys.modules.pop(key)
-
-        try:
-            with patch("builtins.__import__", side_effect=blocking_import):
-                with pytest.raises(
-                    ImportError, match=r"pip install fastapi-toolsets\[cli\]"
-                ):
                     importlib.import_module("fastapi_toolsets.cli.app")
         finally:
             for key in list(sys.modules):

tests/test_metrics.py

@@ -1,6 +1,5 @@
 """Tests for fastapi_toolsets.metrics module."""
 
-import os
 import tempfile
 from unittest.mock import AsyncMock, MagicMock
 
@@ -287,6 +286,16 @@ class TestIncludeRegistry:
 class TestInitMetrics:
     """Tests for init_metrics function."""
 
+    @pytest.fixture
+    def metrics_client(self):
+        """Create a FastAPI app with MetricsRegistry and return a TestClient."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry)
+        client = TestClient(app)
+        yield client
+        client.close()
+
     def test_returns_app(self):
         """Returns the FastAPI app."""
         app = FastAPI()
@@ -294,26 +303,14 @@ class TestInitMetrics:
         result = init_metrics(app, registry)
         assert result is app
 
-    def test_metrics_endpoint_responds(self):
+    def test_metrics_endpoint_responds(self, metrics_client):
         """The /metrics endpoint returns 200."""
-        app = FastAPI()
+        response = metrics_client.get("/metrics")
-        registry = MetricsRegistry()
-        init_metrics(app, registry)
-
-        client = TestClient(app)
-        response = client.get("/metrics")
-
         assert response.status_code == 200
 
-    def test_metrics_endpoint_content_type(self):
+    def test_metrics_endpoint_content_type(self, metrics_client):
         """The /metrics endpoint returns prometheus content type."""
-        app = FastAPI()
+        response = metrics_client.get("/metrics")
-        registry = MetricsRegistry()
-        init_metrics(app, registry)
-
-        client = TestClient(app)
-        response = client.get("/metrics")
-
         assert "text/plain" in response.headers["content-type"]
 
     def test_custom_path(self):
@@ -445,11 +442,10 @@ class TestInitMetrics:
 class TestMultiProcessMode:
     """Tests for multi-process Prometheus mode."""
 
-    def test_multiprocess_with_env_var(self):
+    def test_multiprocess_with_env_var(self, monkeypatch):
         """Multi-process mode works when PROMETHEUS_MULTIPROC_DIR is set."""
         with tempfile.TemporaryDirectory() as tmpdir:
-            os.environ["PROMETHEUS_MULTIPROC_DIR"] = tmpdir
+            monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", tmpdir)
-            try:
             # Use a separate registry to avoid conflicts with default
             prom_registry = CollectorRegistry()
             app = FastAPI()
@@ -469,12 +465,10 @@ class TestMultiProcessMode:
             response = client.get("/metrics")
 
             assert response.status_code == 200
-            finally:
-                del os.environ["PROMETHEUS_MULTIPROC_DIR"]
 
-    def test_single_process_without_env_var(self):
+    def test_single_process_without_env_var(self, monkeypatch):
         """Single-process mode when PROMETHEUS_MULTIPROC_DIR is not set."""
-        os.environ.pop("PROMETHEUS_MULTIPROC_DIR", None)
+        monkeypatch.delenv("PROMETHEUS_MULTIPROC_DIR", raising=False)
 
         app = FastAPI()
         registry = MetricsRegistry()

tests/test_models.py

@@ -6,27 +6,28 @@ from contextlib import suppress
 from types import SimpleNamespace
 from unittest.mock import patch
 
-import fastapi_toolsets.models.watched as _watched_module
 import pytest
 from sqlalchemy import String
-from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
 
+from fastapi_toolsets.pytest import create_db_session
+
+import fastapi_toolsets.models.watched as _watched_module
 from fastapi_toolsets.models import (
     CreatedAtMixin,
     ModelEvent,
     TimestampMixin,
+    UpdatedAtMixin,
     UUIDMixin,
     UUIDv7Mixin,
-    UpdatedAtMixin,
     WatchedFieldsMixin,
     watch,
 )
 from fastapi_toolsets.models.watched import (
     _SESSION_CREATES,
     _SESSION_DELETES,
-    _SESSION_UPDATES,
     _SESSION_PENDING_NEW,
+    _SESSION_UPDATES,
     _after_commit,
     _after_flush,
     _after_flush_postexec,
@@ -81,8 +82,6 @@ class FullMixinModel(MixinBase, UUIDMixin, UpdatedAtMixin):
     name: Mapped[str] = mapped_column(String(50))
 
 
-# --- WatchedFieldsMixin test models ---
-
 _test_events: list[dict] = []
 
 
@@ -145,6 +144,66 @@ class NonWatchedModel(MixinBase):
     value: Mapped[str] = mapped_column(String(50))
 
 
+_poly_events: list[dict] = []
+
+
+class PolyAnimal(MixinBase, UUIDMixin, WatchedFieldsMixin):
+    """Base class for STI polymorphism tests."""
+
+    __tablename__ = "mixin_poly_animals"
+    __mapper_args__ = {"polymorphic_on": "kind", "polymorphic_identity": "animal"}
+
+    kind: Mapped[str] = mapped_column(String(50))
+    name: Mapped[str] = mapped_column(String(50))
+
+    async def on_create(self) -> None:
+        _poly_events.append(
+            {"event": "create", "type": type(self).__name__, "obj_id": self.id}
+        )
+
+    async def on_delete(self) -> None:
+        _poly_events.append(
+            {"event": "delete", "type": type(self).__name__, "obj_id": self.id}
+        )
+
+
+class PolyDog(PolyAnimal):
+    """STI subclass — shares the same table as PolyAnimal."""
+
+    __mapper_args__ = {"polymorphic_identity": "dog"}
+
+
+_watch_inherit_events: list[dict] = []
+
+
+@watch("status")
+class WatchParent(MixinBase, UUIDMixin, WatchedFieldsMixin):
+    """Base class with @watch("status") — subclasses should inherit this filter."""
+
+    __tablename__ = "mixin_watch_parent"
+    __mapper_args__ = {"polymorphic_on": "kind", "polymorphic_identity": "parent"}
+
+    kind: Mapped[str] = mapped_column(String(50))
+    status: Mapped[str] = mapped_column(String(50))
+    other: Mapped[str] = mapped_column(String(50))
+
+    async def on_update(self, changes: dict) -> None:
+        _watch_inherit_events.append({"type": type(self).__name__, "changes": changes})
+
+
+class WatchChild(WatchParent):
+    """STI subclass that does NOT redeclare @watch — should inherit parent's filter."""
+
+    __mapper_args__ = {"polymorphic_identity": "child"}
+
+
+@watch("other")
+class WatchOverride(WatchParent):
+    """STI subclass that overrides @watch with a different field."""
+
+    __mapper_args__ = {"polymorphic_identity": "override"}
+
+
 _attr_access_events: list[dict] = []
 
 
@@ -172,6 +231,7 @@ class AttrAccessModel(MixinBase, UUIDMixin, WatchedFieldsMixin):
 
 
 _sync_events: list[dict] = []
+_future_events: list[str] = []
 
 
 @watch("status")
@@ -192,41 +252,33 @@ class SyncCallbackModel(MixinBase, UUIDMixin, WatchedFieldsMixin):
         _sync_events.append({"event": "update", "changes": changes})
 
 
+class FutureCallbackModel(MixinBase, UUIDMixin, WatchedFieldsMixin):
+    """Model whose on_create returns an asyncio.Task (awaitable, not a coroutine)."""
+
+    __tablename__ = "mixin_future_callback_models"
+
+    name: Mapped[str] = mapped_column(String(50))
+
+    def on_create(self) -> "asyncio.Task[None]":
+        async def _work() -> None:
+            _future_events.append("created")
+
+        return asyncio.ensure_future(_work())
+
+
 @pytest.fixture(scope="function")
 async def mixin_session():
-    engine = create_async_engine(DATABASE_URL, echo=False)
+    async with create_db_session(DATABASE_URL, MixinBase) as session:
-    async with engine.begin() as conn:
-        await conn.run_sync(MixinBase.metadata.create_all)
-
-    session_factory = async_sessionmaker(engine, expire_on_commit=False)
-    session = session_factory()
-
-    try:
         yield session
-    finally:
-        await session.close()
-        async with engine.begin() as conn:
-            await conn.run_sync(MixinBase.metadata.drop_all)
-        await engine.dispose()
 
 
 @pytest.fixture(scope="function")
 async def mixin_session_expire():
     """Session with expire_on_commit=True (the default) to exercise attribute access after commit."""
-    engine = create_async_engine(DATABASE_URL, echo=False)
+    async with create_db_session(
-    async with engine.begin() as conn:
+        DATABASE_URL, MixinBase, expire_on_commit=True
-        await conn.run_sync(MixinBase.metadata.create_all)
+    ) as session:
-
-    session_factory = async_sessionmaker(engine, expire_on_commit=True)
-    session = session_factory()
-
-    try:
         yield session
-    finally:
-        await session.close()
-        async with engine.begin() as conn:
-            await conn.run_sync(MixinBase.metadata.drop_all)
-        await engine.dispose()
 
 
 class TestUUIDMixin:
@@ -473,6 +525,67 @@ class TestWatchDecorator:
             watch()
 
 
+class TestWatchInheritance:
+    @pytest.fixture(autouse=True)
+    def clear_events(self):
+        _watch_inherit_events.clear()
+        yield
+        _watch_inherit_events.clear()
+
+    @pytest.mark.anyio
+    async def test_child_inherits_parent_watch_filter(self, mixin_session):
+        """Subclass without @watch inherits the parent's field filter."""
+        obj = WatchChild(status="initial", other="x")
+        mixin_session.add(obj)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        obj.other = "changed"  # not watched by parent's @watch("status")
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        assert _watch_inherit_events == []
+
+    @pytest.mark.anyio
+    async def test_child_triggers_on_watched_field(self, mixin_session):
+        """Subclass without @watch triggers on_update for the parent's watched field."""
+        obj = WatchChild(status="initial", other="x")
+        mixin_session.add(obj)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        obj.status = "updated"
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        assert len(_watch_inherit_events) == 1
+        assert _watch_inherit_events[0]["type"] == "WatchChild"
+        assert "status" in _watch_inherit_events[0]["changes"]
+
+    @pytest.mark.anyio
+    async def test_subclass_override_takes_precedence(self, mixin_session):
+        """Subclass @watch overrides the parent's field filter."""
+        obj = WatchOverride(status="initial", other="x")
+        mixin_session.add(obj)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        obj.status = (
+            "changed"  # watched by parent but overridden by child's @watch("other")
+        )
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        assert _watch_inherit_events == []
+
+        obj.other = "changed"
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        assert len(_watch_inherit_events) == 1
+        assert "other" in _watch_inherit_events[0]["changes"]
+
+
 class TestUpsertChanges:
     def test_inserts_new_entry(self):
         """New key is inserted with the full changes dict."""
@@ -871,6 +984,119 @@ class TestWatchedFieldsMixin:
         }
 
 
+class TestTransientObject:
+    """Create + delete within the same transaction should fire no events."""
+
+    @pytest.fixture(autouse=True)
+    def clear_events(self):
+        _test_events.clear()
+        yield
+        _test_events.clear()
+
+    @pytest.mark.anyio
+    async def test_no_events_when_created_and_deleted_in_same_transaction(
+        self, mixin_session
+    ):
+        """Neither on_create nor on_delete fires when the object never survives a commit."""
+        obj = WatchedModel(status="active", other="x")
+        mixin_session.add(obj)
+        await mixin_session.flush()
+        await mixin_session.delete(obj)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        assert _test_events == []
+
+    @pytest.mark.anyio
+    async def test_other_objects_unaffected(self, mixin_session):
+        """on_create still fires for objects that are not deleted in the same transaction."""
+        survivor = WatchedModel(status="active", other="x")
+        transient = WatchedModel(status="gone", other="y")
+        mixin_session.add(survivor)
+        mixin_session.add(transient)
+        await mixin_session.flush()
+        await mixin_session.delete(transient)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        creates = [e for e in _test_events if e["event"] == "create"]
+        deletes = [e for e in _test_events if e["event"] == "delete"]
+        assert len(creates) == 1
+        assert creates[0]["obj_id"] == survivor.id
+        assert deletes == []
+
+    @pytest.mark.anyio
+    async def test_distinct_create_and_delete_both_fire(self, mixin_session):
+        """on_create and on_delete both fire when different objects are created and deleted."""
+        existing = WatchedModel(status="old", other="x")
+        mixin_session.add(existing)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+        _test_events.clear()
+
+        new_obj = WatchedModel(status="new", other="y")
+        mixin_session.add(new_obj)
+        await mixin_session.delete(existing)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        creates = [e for e in _test_events if e["event"] == "create"]
+        deletes = [e for e in _test_events if e["event"] == "delete"]
+        assert len(creates) == 1
+        assert len(deletes) == 1
+
+
+class TestPolymorphism:
+    """WatchedFieldsMixin with STI (Single Table Inheritance)."""
+
+    @pytest.fixture(autouse=True)
+    def clear_events(self):
+        _poly_events.clear()
+        yield
+        _poly_events.clear()
+
+    @pytest.mark.anyio
+    async def test_on_create_fires_once_for_subclass(self, mixin_session):
+        """on_create fires exactly once for a STI subclass instance."""
+        dog = PolyDog(name="Rex")
+        mixin_session.add(dog)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        assert len(_poly_events) == 1
+        assert _poly_events[0]["event"] == "create"
+        assert _poly_events[0]["type"] == "PolyDog"
+
+    @pytest.mark.anyio
+    async def test_on_delete_fires_for_subclass(self, mixin_session):
+        """on_delete fires for a STI subclass instance."""
+        dog = PolyDog(name="Rex")
+        mixin_session.add(dog)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+        _poly_events.clear()
+
+        await mixin_session.delete(dog)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        assert len(_poly_events) == 1
+        assert _poly_events[0]["event"] == "delete"
+        assert _poly_events[0]["type"] == "PolyDog"
+
+    @pytest.mark.anyio
+    async def test_transient_subclass_fires_no_events(self, mixin_session):
+        """Create + delete of a STI subclass in one transaction fires no events."""
+        dog = PolyDog(name="Rex")
+        mixin_session.add(dog)
+        await mixin_session.flush()
+        await mixin_session.delete(dog)
+        await mixin_session.commit()
+        await asyncio.sleep(0)
+
+        assert _poly_events == []
+
+
 class TestWatchAll:
     @pytest.fixture(autouse=True)
     def clear_events(self):
@@ -968,6 +1194,28 @@ class TestSyncCallbacks:
         assert updates[0]["changes"]["status"] == {"old": "initial", "new": "updated"}
 
 
+class TestFutureCallbacks:
+    """Callbacks returning a non-coroutine awaitable (asyncio.Task / Future)."""
+
+    @pytest.fixture(autouse=True)
+    def clear_events(self):
+        _future_events.clear()
+        yield
+        _future_events.clear()
+
+    @pytest.mark.anyio
+    async def test_task_callback_is_awaited(self, mixin_session):
+        """on_create returning an asyncio.Task is awaited and its work completes."""
+        obj = FutureCallbackModel(name="test")
+        mixin_session.add(obj)
+        await mixin_session.commit()
+        # Two turns: one for _run() to execute, one for the inner _work() task.
+        await asyncio.sleep(0)
+        await asyncio.sleep(0)
+
+        assert _future_events == ["created"]
+
+
 class TestAttributeAccessInCallbacks:
     """Verify that self attributes are accessible inside every callback type.
 

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 +337,55 @@ 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 TestDeprecatedCleanupTables:
+    """Tests for the deprecated cleanup_tables re-export in fastapi_toolsets.pytest."""
+
+    @pytest.mark.anyio
+    async def test_emits_deprecation_warning(self):
+        """cleanup_tables imported from fastapi_toolsets.pytest emits DeprecationWarning."""
+        from fastapi_toolsets.pytest.utils import cleanup_tables
+
+        async with create_db_session(DATABASE_URL, Base, drop_tables=True) as session:
+            with pytest.warns(DeprecationWarning, match="fastapi_toolsets.db"):
+                await cleanup_tables(session, Base)
+
 
 class TestGetXdistWorker:
     """Tests for _get_xdist_worker helper."""

tests/test_schemas.py

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

uv.lock

@@ -251,7 +251,7 @@ wheels = [
 
 [[package]]
 name = "fastapi-toolsets"
-version = "2.4.0"
+version = "2.4.3"
 source = { editable = "." }
 dependencies = [
     { name = "asyncpg" },
@@ -286,6 +286,7 @@ dev = [
     { name = "fastapi-toolsets", extra = ["all"] },
     { name = "httpx" },
     { name = "mkdocstrings-python" },
+    { name = "prek" },
     { name = "pytest" },
     { name = "pytest-anyio" },
     { name = "pytest-cov" },
@@ -328,6 +329,7 @@ dev = [
     { name = "fastapi-toolsets", extras = ["all"] },
     { name = "httpx", specifier = ">=0.25.0" },
     { name = "mkdocstrings-python", specifier = ">=2.0.2" },
+    { name = "prek", specifier = ">=0.3.8" },
     { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-anyio", specifier = ">=0.0.0" },
     { name = "pytest-cov", specifier = ">=4.0.0" },
@@ -417,6 +419,7 @@ wheels = [
 name = "griffelib"
 version = "2.0.0"
 source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/ad/06/eccbd311c9e2b3ca45dbc063b93134c57a1ccc7607c5e545264ad092c4a9/griffelib-2.0.0.tar.gz", hash = "sha256:e504d637a089f5cab9b5daf18f7645970509bf4f53eda8d79ed71cce8bd97934", size = 166312, upload-time = "2026-03-23T21:06:55.954Z" }
 wheels = [
     { url = "https://files.pythonhosted.org/packages/4d/51/c936033e16d12b627ea334aaaaf42229c37620d0f15593456ab69ab48161/griffelib-2.0.0-py3-none-any.whl", hash = "sha256:01284878c966508b6d6f1dbff9b6fa607bc062d8261c5c7253cb285b06422a7f", size = 142004, upload-time = "2026-02-09T19:09:40.561Z" },
 ]
@@ -720,6 +723,30 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/54/20/4d324d65cc6d9205fabedc306948156824eb9f0ee1633355a8f7ec5c66bf/pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746", size = 20538, upload-time = "2025-05-15T12:30:06.134Z" },
 ]
 
+[[package]]
+name = "prek"
+version = "0.3.8"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/62/ee/03e8180e3fda9de25b6480bd15cc2bde40d573868d50648b0e527b35562f/prek-0.3.8.tar.gz", hash = "sha256:434a214256516f187a3ab15f869d950243be66b94ad47987ee4281b69643a2d9", size = 400224, upload-time = "2026-03-23T08:23:35.981Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/00/84/40d2ddf362d12c4cd4a25a8c89a862edf87cdfbf1422aa41aac8e315d409/prek-0.3.8-py3-none-linux_armv6l.whl", hash = "sha256:6fb646ada60658fa6dd7771b2e0fb097f005151be222f869dada3eb26d79ed33", size = 5226646, upload-time = "2026-03-23T08:23:18.306Z" },
+    { url = "https://files.pythonhosted.org/packages/e1/52/7308a033fa43b7e8e188797bd2b3b017c0f0adda70fa7af575b1f43ea888/prek-0.3.8-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:f3d7fdadb15efc19c09953c7a33cf2061a70f367d1e1957358d3ad5cc49d0616", size = 5620104, upload-time = "2026-03-23T08:23:40.053Z" },
+    { url = "https://files.pythonhosted.org/packages/ff/b1/f106ac000a91511a9cd80169868daf2f5b693480ef5232cec5517a38a512/prek-0.3.8-py3-none-macosx_11_0_arm64.whl", hash = "sha256:72728c3295e79ca443f8c1ec037d2a5b914ec73a358f69cf1bc1964511876bf8", size = 5199867, upload-time = "2026-03-23T08:23:38.066Z" },
+    { url = "https://files.pythonhosted.org/packages/b3/e9/970713f4b019f69de9844e1bab37b8ddb67558e410916f4eb5869a696165/prek-0.3.8-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.musllinux_1_1_aarch64.whl", hash = "sha256:48efc28f2f53b5b8087efca9daaed91572d62df97d5f24a1c7a087fecb5017de", size = 5441801, upload-time = "2026-03-23T08:23:32.617Z" },
+    { url = "https://files.pythonhosted.org/packages/12/a4/7ef44032b181753e19452ec3b09abb3a32607cf6b0a0508f0604becaaf2b/prek-0.3.8-py3-none-manylinux_2_17_armv7l.manylinux2014_armv7l.whl", hash = "sha256:f6ca9d63bacbc448a5c18e955c78d3ac5176c3a17c3baacdd949b1a623e08a36", size = 5155107, upload-time = "2026-03-23T08:23:31.021Z" },
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