Create CNAME

* ⬆ 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

README.md

@@ -20,7 +20,7 @@ A modular collection of production-ready utilities for FastAPI. Install only wha
 
 ## Installation
 
-The base package includes the core modules (CRUD, database, schemas, exceptions, fixtures, dependencies, logging):
+The base package includes the core modules (CRUD, database, schemas, exceptions, fixtures, dependencies, model mixins, logging):
 
 ```bash
 uv add fastapi-toolsets
@@ -29,9 +29,9 @@ uv add fastapi-toolsets
 Install only the extras you need:
 
 ```bash
-uv add "fastapi-toolsets[cli]"      # CLI (typer)
+uv add "fastapi-toolsets[cli]"
-uv add "fastapi-toolsets[metrics]"  # Prometheus metrics (prometheus_client)
+uv add "fastapi-toolsets[metrics]"
-uv add "fastapi-toolsets[pytest]"   # Pytest helpers (httpx, pytest-xdist)
+uv add "fastapi-toolsets[pytest]"
 ```
 
 Or install everything:
@@ -48,7 +48,8 @@ uv add "fastapi-toolsets[all]"
 - **Database**: Session management, transaction helpers, table locking, and polling-based row change detection
 - **Dependencies**: FastAPI dependency factories (`PathDependency`, `BodyDependency`) for automatic DB lookups from path or body parameters
 - **Fixtures**: Fixture system with dependency management, context support, and pytest integration
-- **Standardized API Responses**: Consistent response format with `Response`, `PaginatedResponse`, and `PydanticBase`
+- **Model Mixins**: SQLAlchemy mixins for common column patterns (`UUIDMixin`, `UUIDv7Mixin`, `CreatedAtMixin`, `UpdatedAtMixin`, `TimestampMixin`) and lifecycle callbacks (`WatchedFieldsMixin`, `@watch`) that fire after commit for insert, update, and delete events
+- **Standardized API Responses**: Consistent response format with `Response`, `ErrorResponse`, `PaginatedResponse`, `CursorPaginatedResponse` and `OffsetPaginatedResponse`.
 - **Exception Handling**: Structured error responses with automatic OpenAPI documentation
 - **Logging**: Logging configuration with uvicorn integration via `configure_logging` and `get_logger`
 

docs/CNAME

@@ -0,0 +1 @@
+fastapi-toolsets.d3vyce.fr

docs/examples/pagination-search.md

@@ -42,12 +42,17 @@ Declare `searchable_fields`, `facet_fields`, and `order_fields` once on [`CrudFa
 
 
 ## Routes
+
+```python title="routes.py:1:17"
+--8<-- "docs_src/examples/pagination_search/routes.py:1:17"
+```
+
 ### Offset pagination
 
 Best for admin panels or any UI that needs a total item count and numbered pages.
 
-```python title="routes.py:1:36"
+```python title="routes.py:20:40"
---8<-- "docs_src/examples/pagination_search/routes.py:1:36"
+--8<-- "docs_src/examples/pagination_search/routes.py:20:40"
 ```
 
 **Example request**
@@ -61,11 +66,13 @@ GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&or
 ```json
 {
   "status": "SUCCESS",
+  "pagination_type": "offset",
   "data": [
     { "id": "3f47ac69-...", "title": "FastAPI tips", "status": "published", ... }
   ],
   "pagination": {
     "total_count": 42,
+    "pages": 5,
     "page": 2,
     "items_per_page": 10,
     "has_more": true
@@ -79,12 +86,14 @@ GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&or
 
 `filter_attributes` always reflects the values visible **after** applying the active filters. Use it to populate filter dropdowns on the client.
 
+To skip the `COUNT(*)` query for better performance on large tables, pass `include_total=False`. `pagination.total_count` will be `null` in the response, while `has_more` remains accurate.
+
 ### Cursor pagination
 
 Best for feeds, infinite scroll, or any high-throughput API where offset performance degrades.
 
-```python title="routes.py:39:59"
+```python title="routes.py:43:63"
---8<-- "docs_src/examples/pagination_search/routes.py:39:59"
+--8<-- "docs_src/examples/pagination_search/routes.py:43:63"
 ```
 
 **Example request**
@@ -98,6 +107,7 @@ GET /articles/cursor?items_per_page=10&status=published&order_by=created_at&orde
 ```json
 {
   "status": "SUCCESS",
+  "pagination_type": "cursor",
   "data": [
     { "id": "3f47ac69-...", "title": "FastAPI tips", "status": "published", ... }
   ],
@@ -116,6 +126,47 @@ GET /articles/cursor?items_per_page=10&status=published&order_by=created_at&orde
 
 Pass `next_cursor` as the `cursor` query parameter on the next request to advance to the next page.
 
+### Unified endpoint (both strategies)
+
+!!! info "Added in `v2.3.0`"
+
+[`paginate()`](../module/crud.md#unified-paginate--both-strategies-on-one-endpoint) lets a single endpoint support both strategies via a `pagination_type` query parameter. The `pagination_type` field in the response acts as a discriminator for frontend tooling.
+
+```python title="routes.py:66:90"
+--8<-- "docs_src/examples/pagination_search/routes.py:66:90"
+```
+
+**Offset request** (default)
+
+```
+GET /articles/?pagination_type=offset&page=1&items_per_page=10
+```
+
+```json
+{
+  "status": "SUCCESS",
+  "pagination_type": "offset",
+  "data": ["..."],
+  "pagination": { "total_count": 42, "pages": 5, "page": 1, "items_per_page": 10, "has_more": true }
+}
+```
+
+**Cursor request**
+
+```
+GET /articles/?pagination_type=cursor&items_per_page=10
+GET /articles/?pagination_type=cursor&items_per_page=10&cursor=eyJ2YWx1ZSI6...
+```
+
+```json
+{
+  "status": "SUCCESS",
+  "pagination_type": "cursor",
+  "data": ["..."],
+  "pagination": { "next_cursor": "eyJ2YWx1ZSI6...", "prev_cursor": null, "items_per_page": 10, "has_more": true }
+}
+```
+
 ## Search behaviour
 
 Both endpoints inherit the same `searchable_fields` declared on `ArticleCrud`:

docs/index.md

@@ -20,7 +20,7 @@ A modular collection of production-ready utilities for FastAPI. Install only wha
 
 ## Installation
 
-The base package includes the core modules (CRUD, database, schemas, exceptions, fixtures, dependencies, logging):
+The base package includes the core modules (CRUD, database, schemas, exceptions, fixtures, dependencies, model mixins, logging):
 
 ```bash
 uv add fastapi-toolsets
@@ -29,9 +29,9 @@ uv add fastapi-toolsets
 Install only the extras you need:
 
 ```bash
-uv add "fastapi-toolsets[cli]"      # CLI (typer)
+uv add "fastapi-toolsets[cli]"
-uv add "fastapi-toolsets[metrics]"  # Prometheus metrics (prometheus_client)
+uv add "fastapi-toolsets[metrics]"
-uv add "fastapi-toolsets[pytest]"   # Pytest helpers (httpx, pytest-xdist)
+uv add "fastapi-toolsets[pytest]"
 ```
 
 Or install everything:
@@ -44,11 +44,12 @@ uv add "fastapi-toolsets[all]"
 
 ### Core
 
-- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in full-text/faceted search and offset/cursor pagination.
+- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in full-text/faceted search and Offset/Cursor pagination.
 - **Database**: Session management, transaction helpers, table locking, and polling-based row change detection
 - **Dependencies**: FastAPI dependency factories (`PathDependency`, `BodyDependency`) for automatic DB lookups from path or body parameters
 - **Fixtures**: Fixture system with dependency management, context support, and pytest integration
-- **Standardized API Responses**: Consistent response format with `Response`, `PaginatedResponse`, and `PydanticBase`
+- **Model Mixins**: SQLAlchemy mixins for common column patterns (`UUIDMixin`, `UUIDv7Mixin`, `CreatedAtMixin`, `UpdatedAtMixin`, `TimestampMixin`) and lifecycle callbacks (`WatchedFieldsMixin`) that fire after commit for insert, update, and delete events.
+- **Standardized API Responses**: Consistent response format with `Response`, `ErrorResponse`, `PaginatedResponse`, `CursorPaginatedResponse` and `OffsetPaginatedResponse`.
 - **Exception Handling**: Structured error responses with automatic OpenAPI documentation
 - **Logging**: Logging configuration with uvicorn integration via `configure_logging` and `get_logger`
 

docs/migration/v2.md

@@ -0,0 +1,137 @@
+# Migrating to v2.0
+
+This page covers every breaking change introduced in **v2.0** and the steps required to update your code.
+
+---
+
+## CRUD
+
+### `schema` is now required in `offset_paginate()` and `cursor_paginate()`
+
+Calls that omit `schema` will now raise a `TypeError` at runtime.
+
+Previously `schema` was optional; omitting it returned raw SQLAlchemy model instances inside the response. It is now a required keyword argument and the response always contains serialized schema instances.
+
+=== "Before (`v1`)"
+
+    ```python
+    # schema omitted — returned raw model instances
+    result = await UserCrud.offset_paginate(session=session, page=1)
+    result = await UserCrud.cursor_paginate(session=session, cursor=token)
+    ```
+
+=== "Now (`v2`)"
+
+    ```python
+    result = await UserCrud.offset_paginate(session=session, page=1, schema=UserRead)
+    result = await UserCrud.cursor_paginate(session=session, cursor=token, schema=UserRead)
+    ```
+
+### `as_response` removed from `create()`, `get()`, and `update()`
+
+Passing `as_response` to these methods will raise a `TypeError` at runtime.
+
+The `as_response=True` shorthand is replaced by passing a `schema` directly. The return value is a `Response[schema]` when `schema` is provided, or the raw model instance when it is not.
+
+=== "Before (`v1`)"
+
+    ```python
+    user = await UserCrud.create(session=session, obj=data, as_response=True)
+    user = await UserCrud.get(session=session, filters=filters, as_response=True)
+    user = await UserCrud.update(session=session, obj=data, filters, as_response=True)
+    ```
+
+=== "Now (`v2`)"
+
+    ```python
+    user = await UserCrud.create(session=session, obj=data, schema=UserRead)
+    user = await UserCrud.get(session=session, filters=filters, schema=UserRead)
+    user = await UserCrud.update(session=session, obj=data, filters, schema=UserRead)
+    ```
+
+### `delete()`: `as_response` renamed and return type changed
+
+`as_response` is gone, and the plain (non-response) call no longer returns `True`.
+
+Two changes were made to `delete()`:
+
+1. The `as_response` parameter is renamed to `return_response`.
+2. When called without `return_response=True`, the method now returns `None` on success instead of `True`.
+
+=== "Before (`v1`)"
+
+    ```python
+    ok = await UserCrud.delete(session=session, filters=filters)
+    if ok:  # True on success
+        ...
+
+    response = await UserCrud.delete(session=session, filters=filters, as_response=True)
+    ```
+
+=== "Now (`v2`)"
+
+    ```python
+    await UserCrud.delete(session=session, filters=filters)  # returns None
+
+    response = await UserCrud.delete(session=session, filters=filters, return_response=True)
+    ```
+
+### `paginate()` alias removed
+
+Any call to `crud.paginate(...)` will raise `AttributeError` at runtime.
+
+The `paginate` shorthand was an alias for `offset_paginate`. It has been removed; call `offset_paginate` directly.
+
+=== "Before (`v1`)"
+
+    ```python
+    result = await UserCrud.paginate(session=session, page=2, items_per_page=20, schema=UserRead)
+    ```
+
+=== "Now (`v2`)"
+
+    ```python
+    result = await UserCrud.offset_paginate(session=session, page=2, items_per_page=20, schema=UserRead)
+    ```
+
+---
+
+## Exceptions
+
+### Missing `api_error` raises `TypeError` at class definition time
+
+Unfinished or stub exception subclasses that previously compiled fine will now fail on import.
+
+In `v1`, a subclass without `api_error` would only fail when the exception was raised. In `v2`, `__init_subclass__` validates this at class definition time.
+
+=== "Before (`v1`)"
+
+    ```python
+    class MyError(ApiException):
+        pass  # fine until raised
+    ```
+
+=== "Now (`v2`)"
+
+    ```python
+    class MyError(ApiException):
+        pass  # TypeError: MyError must define an 'api_error' class attribute.
+    ```
+
+For shared base classes that are not meant to be raised directly, use `abstract=True`:
+
+```python
+class BillingError(ApiException, abstract=True):
+    """Base for all billing-related errors — not raised directly."""
+
+class PaymentRequiredError(BillingError):
+    api_error = ApiError(code=402, msg="Payment Required", desc="...", err_code="BILLING-402")
+```
+
+---
+
+## Schemas
+
+### `Pagination` alias removed
+
+`Pagination` was already deprecated in `v1` and is fully removed in `v2`, you now need to use [`OffsetPagination`](../reference/schemas.md#fastapi_toolsets.schemas.OffsetPagination) or [`CursorPagination`](../reference/schemas.md#fastapi_toolsets.schemas.CursorPagination).

docs/module/crud.md

@@ -7,10 +7,12 @@ Generic async CRUD operations for SQLAlchemy models with search, pagination, and
 
 ## Overview
 
-The `crud` module provides [`AsyncCrud`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud), an abstract base class with a full suite of async database operations, and [`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory), a convenience function to instantiate it for a given model.
+The `crud` module provides [`AsyncCrud`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud), a base class with a full suite of async database operations, and [`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory), a convenience function to instantiate it for a given model.
 
 ## Creating a CRUD class
 
+### Factory style
+
 ```python
 from fastapi_toolsets.crud import CrudFactory
 from myapp.models import User
@@ -18,10 +20,70 @@ from myapp.models import User
 UserCrud = CrudFactory(model=User)
 ```
 
-[`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory) dynamically creates a class named `AsyncUserCrud` with `User` as its model.
+[`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory) dynamically creates a class named `AsyncUserCrud` with `User` as its model. This is the most concise option for straightforward CRUD with no custom logic.
+
+### Subclass style
+
+!!! info "Added in `v2.3.0`"
+
+```python
+from fastapi_toolsets.crud.factory import AsyncCrud
+from myapp.models import User
+
+class UserCrud(AsyncCrud[User]):
+    model = User
+    searchable_fields = [User.username, User.email]
+    default_load_options = [selectinload(User.role)]
+```
+
+Subclassing [`AsyncCrud`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud) directly is the preferred style when you need to add custom methods or when the configuration is complex enough to benefit from a named class body.
+
+### Adding custom methods
+
+```python
+class UserCrud(AsyncCrud[User]):
+    model = User
+
+    @classmethod
+    async def get_active(cls, session: AsyncSession) -> list[User]:
+        return await cls.get_multi(session, filters=[User.is_active == True])
+```
+
+### Sharing a custom base across multiple models
+
+Define a generic base class with the shared methods, then subclass it for each model:
+
+```python
+from typing import Generic, TypeVar
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import DeclarativeBase
+from fastapi_toolsets.crud.factory import AsyncCrud
+
+T = TypeVar("T", bound=DeclarativeBase)
+
+class AuditedCrud(AsyncCrud[T], Generic[T]):
+    """Base CRUD with custom function"""
+
+    @classmethod
+    async def get_active(cls, session: AsyncSession):
+        return await cls.get_multi(session, filters=[cls.model.is_active == True])
+
+
+class UserCrud(AuditedCrud[User]):
+    model = User
+    searchable_fields = [User.username, User.email]
+```
+
+You can also use the factory shorthand with the same base by passing `base_class`:
+
+```python
+UserCrud = CrudFactory(User, base_class=AuditedCrud)
+```
 
 ## Basic operations
 
+!!! info "`get_or_none` added in `v2.2`"
+
 ```python
 # Create
 user = await UserCrud.create(session=session, obj=UserCreateSchema(username="alice"))
@@ -29,6 +91,9 @@ user = await UserCrud.create(session=session, obj=UserCreateSchema(username="ali
 # Get one (raises NotFoundError if not found)
 user = await UserCrud.get(session=session, filters=[User.id == user_id])
 
+# Get one or None (never raises)
+user = await UserCrud.get_or_none(session=session, filters=[User.id == user_id])
+
 # Get first or None
 user = await UserCrud.first(session=session, filters=[User.email == email])
 
@@ -46,48 +111,78 @@ count = await UserCrud.count(session=session, filters=[User.is_active == True])
 exists = await UserCrud.exists(session=session, filters=[User.email == email])
 ```
 
+## Fetching a single record
+
+Three methods fetch a single record — choose based on how you want to handle the "not found" case and whether you need strict uniqueness:
+
+| Method | Not found | Multiple results |
+|---|---|---|
+| `get` | raises `NotFoundError` | raises `MultipleResultsFound` |
+| `get_or_none` | returns `None` | raises `MultipleResultsFound` |
+| `first` | returns `None` | returns the first match silently |
+
+Use `get` when the record must exist (e.g. a detail endpoint that should return 404):
+
+```python
+user = await UserCrud.get(session=session, filters=[User.id == user_id])
+```
+
+Use `get_or_none` when the record may not exist but you still want strict uniqueness enforcement:
+
+```python
+user = await UserCrud.get_or_none(session=session, filters=[User.email == email])
+if user is None:
+    ...  # handle missing case without catching an exception
+```
+
+Use `first` when you only care about any one match and don't need uniqueness:
+
+```python
+user = await UserCrud.first(session=session, filters=[User.is_active == True])
+```
+
 ## Pagination
 
 !!! info "Added in `v1.1` (only offset_pagination via `paginate` if `<v1.1`)"
 
-Two pagination strategies are available. Both return a [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse) but differ in how they navigate through results.
+Three pagination methods are available.  All return a typed response whose `pagination_type` field tells clients which strategy was used.
 
-| | `offset_paginate` | `cursor_paginate` |
+| | `offset_paginate` | `cursor_paginate` | `paginate` |
-|---|---|---|
+|---|---|---|---|
-| Total count | Yes | No |
+| Return type | `OffsetPaginatedResponse` | `CursorPaginatedResponse` | either, based on `pagination_type` param |
-| Jump to arbitrary page | Yes | No |
+| Total count | Yes | No | / |
-| Performance on deep pages | Degrades | Constant |
+| Jump to arbitrary page | Yes | No | / |
-| Stable under concurrent inserts | No | Yes |
+| Performance on deep pages | Degrades | Constant | / |
-| Search compatible | Yes | Yes |
+| Stable under concurrent inserts | No | Yes | / |
-| Use case | Admin panels, numbered pagination | Feeds, APIs, infinite scroll |
+| Use case | Admin panels, numbered pagination | Feeds, APIs, infinite scroll | single endpoint, both strategies |
 
 ### Offset pagination
 
 ```python
-@router.get(
+@router.get("")
-    "",
-    response_model=PaginatedResponse[User],
-)
 async def get_users(
     session: SessionDep,
     items_per_page: int = 50,
     page: int = 1,
-):
+) -> OffsetPaginatedResponse[UserRead]:
-    return await crud.UserCrud.offset_paginate(
+    return await UserCrud.offset_paginate(
         session=session,
         items_per_page=items_per_page,
         page=page,
+        schema=UserRead,
     )
 ```
 
-The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) method returns a [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse) whose `pagination` field is an [`OffsetPagination`](../reference/schemas.md#fastapi_toolsets.schemas.OffsetPagination) object:
+The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) method returns an [`OffsetPaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.OffsetPaginatedResponse):
 
 ```json
 {
   "status": "SUCCESS",
+  "pagination_type": "offset",
   "data": ["..."],
   "pagination": {
     "total_count": 100,
+    "pages": 5,
     "page": 1,
     "items_per_page": 20,
     "has_more": true
@@ -95,33 +190,63 @@ The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.Async
 }
 ```
 
-!!! warning "Deprecated: `paginate`"
+#### Skipping the COUNT query
-    The `paginate` function is a backward-compatible alias for `offset_paginate`. This function is **deprecated** and will be removed in **v2.0**.
+
+!!! 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
-@router.get(
+@router.get("")
-    "",
-    response_model=PaginatedResponse[UserRead],
-)
 async def list_users(
     session: SessionDep,
     cursor: str | None = None,
     items_per_page: int = 20,
-):
+) -> CursorPaginatedResponse[UserRead]:
     return await UserCrud.cursor_paginate(
         session=session,
         cursor=cursor,
         items_per_page=items_per_page,
+        schema=UserRead,
     )
 ```
 
-The [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate) method returns a [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse) whose `pagination` field is a [`CursorPagination`](../reference/schemas.md#fastapi_toolsets.schemas.CursorPagination) object:
+The [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate) method returns a [`CursorPaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.CursorPaginatedResponse):
 
 ```json
 {
   "status": "SUCCESS",
+  "pagination_type": "cursor",
   "data": ["..."],
   "pagination": {
     "next_cursor": "eyJ2YWx1ZSI6ICIzZjQ3YWM2OS0uLi4ifQ==",
@@ -148,7 +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 |
 |---|---|
@@ -166,6 +291,76 @@ 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`"
+
+[`paginate()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.paginate) dispatches to `offset_paginate` or `cursor_paginate` based on a `pagination_type` query parameter, letting you expose **one endpoint** that supports both strategies.  The `pagination_type` field in the response tells clients which strategy was used, enabling frontend discriminated-union typing.
+
+```python
+from fastapi_toolsets.crud import PaginationType
+from fastapi_toolsets.schemas import PaginatedResponse
+
+@router.get("")
+async def list_users(
+    session: SessionDep,
+    pagination_type: PaginationType = PaginationType.OFFSET,
+    page: int = Query(1, ge=1, description="Current page (offset only)"),
+    cursor: str | None = Query(None, description="Cursor token (cursor only)"),
+    items_per_page: int = Query(20, ge=1, le=100),
+) -> PaginatedResponse[UserRead]:
+    return await UserCrud.paginate(
+        session,
+        pagination_type=pagination_type,
+        page=page,
+        cursor=cursor,
+        items_per_page=items_per_page,
+        schema=UserRead,
+    )
+```
+
+```
+GET /users?pagination_type=offset&page=2&items_per_page=10
+GET /users?pagination_type=cursor&cursor=eyJ2YWx1ZSI6...&items_per_page=10
+```
+
+#### Pagination params dependency
+
+!!! info "Added in `v2.4.1`"
+
+Use [`paginate_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.paginate_params) to inject all parameters at once with configurable defaults and a `max_page_size` cap:
+
+```python
+from typing import Annotated
+from fastapi import Depends
+from fastapi_toolsets.schemas import PaginatedResponse
+
+@router.get("")
+async def list_users(
+    session: SessionDep,
+    params: Annotated[dict, Depends(UserCrud.paginate_params(default_page_size=20, max_page_size=100))],
+) -> PaginatedResponse[UserRead]:
+    return await UserCrud.paginate(session, **params, schema=UserRead)
+```
+
 ## Search
 
 Two search strategies are available, both compatible with [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) and [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate).
@@ -180,6 +375,9 @@ Two search strategies are available, both compatible with [`offset_paginate`](..
 
 ### Full-text search
 
+!!! info "Added in `v2.2.1`"
+    The model's primary key is always included in `searchable_fields` automatically, so searching by ID works out of the box without any configuration. When no `searchable_fields` are declared, only the primary key is searched.
+
 Declare `searchable_fields` on the CRUD class. Relationship traversal is supported via tuples:
 
 ```python
@@ -205,40 +403,36 @@ result = await UserCrud.offset_paginate(
 This allows searching with both [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) and [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate):
 
 ```python
-@router.get(
+@router.get("")
-    "",
-    response_model=PaginatedResponse[User],
-)
 async def get_users(
     session: SessionDep,
     items_per_page: int = 50,
     page: int = 1,
     search: str | None = None,
-):
+) -> OffsetPaginatedResponse[UserRead]:
-    return await crud.UserCrud.offset_paginate(
+    return await UserCrud.offset_paginate(
         session=session,
         items_per_page=items_per_page,
         page=page,
         search=search,
+        schema=UserRead,
     )
 ```
 
 ```python
-@router.get(
+@router.get("")
-    "",
-    response_model=PaginatedResponse[User],
-)
 async def get_users(
     session: SessionDep,
     cursor: str | None = None,
     items_per_page: int = 50,
     search: str | None = None,
-):
+) -> CursorPaginatedResponse[UserRead]:
-    return await crud.UserCrud.cursor_paginate(
+    return await UserCrud.cursor_paginate(
         session=session,
         items_per_page=items_per_page,
         cursor=cursor,
         search=search,
+        schema=UserRead,
     )
 ```
 
@@ -280,7 +474,7 @@ The distinct values are returned in the `filter_attributes` field of [`Paginated
   "filter_attributes": {
     "status": ["active", "inactive"],
     "country": ["DE", "FR", "US"],
-    "name": ["admin", "editor", "viewer"]
+    "role__name": ["admin", "editor", "viewer"]
   }
 }
 ```
@@ -288,7 +482,7 @@ The distinct values are returned in the `filter_attributes` field of [`Paginated
 Use `filter_by` to pass the client's chosen filter values directly — no need to build SQLAlchemy conditions by hand. Any unknown key raises [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError).
 
 !!! info "The keys in `filter_by` are the same keys the client received in `filter_attributes`."
-    Keys are normally the terminal `column.key` (e.g. `"name"` for `Role.name`). When two facet fields share the same column key (e.g. `(Build.project, Project.name)` and `(Build.os, Os.name)`), the relationship name is prepended automatically: `"project__name"` and `"os__name"`.
+    Keys use `__` as a separator for the full relationship chain. A direct column `User.status` produces `"status"`. A relationship tuple `(User.role, Role.name)` produces `"role__name"`. A deeper chain `(User.role, Role.permission, Permission.name)` produces `"role__permission__name"`.
 
 `filter_by` and `filters` can be combined — both are applied with AND logic.
 
@@ -309,20 +503,21 @@ async def list_users(
     session: SessionDep,
     page: int = 1,
     filter_by: Annotated[dict[str, list[str]], Depends(UserCrud.filter_params())],
-) -> PaginatedResponse[UserRead]:
+) -> OffsetPaginatedResponse[UserRead]:
     return await UserCrud.offset_paginate(
         session=session,
         page=page,
         filter_by=filter_by,
+        schema=UserRead,
     )
 ```
 
 Both single-value and multi-value query parameters work:
 
 ```
-GET /users?status=active              → filter_by={"status": ["active"]}
+GET /users?status=active                      → filter_by={"status": ["active"]}
-GET /users?status=active&country=FR   → filter_by={"status": ["active"], "country": ["FR"]}
+GET /users?status=active&country=FR           → filter_by={"status": ["active"], "country": ["FR"]}
-GET /users?role=admin&role=editor     → filter_by={"role": ["admin", "editor"]}  (IN clause)
+GET /users?role__name=admin&role__name=editor → filter_by={"role__name": ["admin", "editor"]}  (IN clause)
 ```
 
 ## Sorting
@@ -353,8 +548,8 @@ from fastapi_toolsets.crud import OrderByClause
 async def list_users(
     session: SessionDep,
     order_by: Annotated[OrderByClause | None, Depends(UserCrud.order_params())],
-) -> PaginatedResponse[UserRead]:
+) -> OffsetPaginatedResponse[UserRead]:
-    return await UserCrud.offset_paginate(session=session, order_by=order_by)
+    return await UserCrud.offset_paginate(session=session, order_by=order_by, schema=UserRead)
 ```
 
 The dependency adds two query parameters to the endpoint:
@@ -461,7 +656,7 @@ async def get_user(session: SessionDep, uuid: UUID) -> Response[UserRead]:
     )
 
 @router.get("")
-async def list_users(session: SessionDep, page: int = 1) -> PaginatedResponse[UserRead]:
+async def list_users(session: SessionDep, page: int = 1) -> OffsetPaginatedResponse[UserRead]:
     return await crud.UserCrud.offset_paginate(
         session=session,
         page=page,
@@ -471,9 +666,6 @@ async def list_users(session: SessionDep, page: int = 1) -> PaginatedResponse[Us
 
 The schema must have `from_attributes=True` (or inherit from [`PydanticBase`](../reference/schemas.md#fastapi_toolsets.schemas.PydanticBase)) so it can be built from SQLAlchemy model instances.
 
-!!! warning "Deprecated: `as_response`"
-    The `as_response=True` parameter is **deprecated** and will be removed in **v2.0**. Replace it with `schema=YourSchema`.
-
 ---
 
 [:material-api: API Reference](../reference/crud.md)

docs/module/db.md

@@ -87,6 +87,37 @@ await wait_for_row_change(
 )
 ```
 
+## Creating a database
+
+!!! info "Added in `v2.1`"
+
+[`create_database`](../reference/db.md#fastapi_toolsets.db.create_database) creates a database at a given URL. It connects to *server_url* and issues a `CREATE DATABASE` statement:
+
+```python
+from fastapi_toolsets.db import create_database
+
+SERVER_URL = "postgresql+asyncpg://postgres:postgres@localhost/postgres"
+
+await create_database(db_name="myapp_test", server_url=SERVER_URL)
+```
+
+For test isolation with automatic cleanup, use [`create_worker_database`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_worker_database) from the `pytest` module instead — it handles drop-before, create, and drop-after automatically.
+
+## Cleaning up tables
+
+!!! info "Added in `v2.1`"
+
+[`cleanup_tables`](../reference/db.md#fastapi_toolsets.db.cleanup_tables) truncates all tables:
+
+```python
+from fastapi_toolsets.db import cleanup_tables
+
+@pytest.fixture(autouse=True)
+async def clean(db_session):
+    yield
+    await cleanup_tables(session=db_session, base=Base)
+```
+
 ---
 
 [:material-api: API Reference](../reference/db.md)

docs/module/dependencies.md

@@ -13,8 +13,13 @@ The `dependencies` module provides two factory functions that create FastAPI dep
 ```python
 from fastapi_toolsets.dependencies import PathDependency
 
+# Plain callable
 UserDep = PathDependency(model=User, field=User.id, session_dep=get_db)
 
+# Annotated
+SessionDep = Annotated[AsyncSession, Depends(get_db)]
+UserDep = PathDependency(model=User, field=User.id, session_dep=SessionDep)
+
 @router.get("/users/{user_id}")
 async def get_user(user: User = UserDep):
     return user
@@ -37,8 +42,14 @@ async def get_user(user: User = UserDep):
 ```python
 from fastapi_toolsets.dependencies import BodyDependency
 
+# Plain callable
 RoleDep = BodyDependency(model=Role, field=Role.id, session_dep=get_db, body_field="role_id")
 
+# Annotated
+SessionDep = Annotated[AsyncSession, Depends(get_db)]
+RoleDep = BodyDependency(model=Role, field=Role.id, session_dep=SessionDep, body_field="role_id")
+
+
 @router.post("/users")
 async def create_user(body: UserCreateSchema, role: Role = RoleDep):
     user = User(username=body.username, role=role)

docs/module/exceptions.md

@@ -21,30 +21,37 @@ init_exceptions_handlers(app=app)
 This registers handlers for:
 
 - [`ApiException`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.ApiException) — all custom exceptions below
+- `HTTPException` — Starlette/FastAPI HTTP errors
 - `RequestValidationError` — Pydantic request validation (422)
 - `ResponseValidationError` — Pydantic response validation (422)
 - `Exception` — unhandled errors (500)
 
+It also patches `app.openapi()` to replace the default Pydantic 422 schema with a structured example matching the `ErrorResponse` format.
+
 ## Built-in exceptions
 
 | Exception | Status | Default message |
 |-----------|--------|-----------------|
 | [`UnauthorizedError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.UnauthorizedError) | 401 | Unauthorized |
 | [`ForbiddenError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.ForbiddenError) | 403 | Forbidden |
-| [`NotFoundError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NotFoundError) | 404 | Not found |
+| [`NotFoundError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NotFoundError) | 404 | Not Found |
 | [`ConflictError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.ConflictError) | 409 | Conflict |
-| [`NoSearchableFieldsError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NoSearchableFieldsError) | 400 | No searchable fields |
+| [`NoSearchableFieldsError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NoSearchableFieldsError) | 400 | No Searchable Fields |
-| [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError) | 400 | Invalid facet filter |
+| [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError) | 400 | Invalid Facet Filter |
+| [`InvalidOrderFieldError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError) | 422 | Invalid Order Field |
+
+### Per-instance overrides
+
+All built-in exceptions accept optional keyword arguments to customise the response for a specific raise site without changing the class defaults:
+
+| Argument | Effect |
+|----------|--------|
+| `detail` | Overrides both `str(exc)` (log output) and the `message` field in the response body |
+| `desc` | Overrides the `description` field |
+| `data` | Overrides the `data` field |
 
 ```python
-from fastapi_toolsets.exceptions import NotFoundError
+raise NotFoundError(detail="User 42 not found", desc="No user with that ID exists in the database.")
-
-@router.get("/users/{id}")
-async def get_user(id: int, session: AsyncSession = Depends(get_db)):
-    user = await UserCrud.first(session=session, filters=[User.id == id])
-    if not user:
-        raise NotFoundError
-    return user
 ```
 
 ## Custom exceptions
@@ -58,12 +65,51 @@ from fastapi_toolsets.schemas import ApiError
 class PaymentRequiredError(ApiException):
     api_error = ApiError(
         code=402,
-        msg="Payment required",
+        msg="Payment Required",
         desc="Your subscription has expired.",
-        err_code="PAYMENT_REQUIRED",
+        err_code="BILLING-402",
     )
 ```
 
+!!! warning
+    Subclasses that do not define `api_error` raise a `TypeError` at **class creation time**, not at raise time.
+
+### Custom `__init__`
+
+Override `__init__` to compute `detail`, `desc`, or `data` dynamically, then delegate to `super().__init__()`:
+
+```python
+class OrderValidationError(ApiException):
+    api_error = ApiError(
+        code=422,
+        msg="Order Validation Failed",
+        desc="One or more order fields are invalid.",
+        err_code="ORDER-422",
+    )
+
+    def __init__(self, *field_errors: str) -> None:
+        super().__init__(
+            f"{len(field_errors)} validation error(s)",
+            desc=", ".join(field_errors),
+            data={"errors": [{"message": e} for e in field_errors]},
+        )
+```
+
+### Intermediate base classes
+
+Use `abstract=True` when creating a shared base that is not meant to be raised directly:
+
+```python
+class BillingError(ApiException, abstract=True):
+    """Base for all billing-related errors."""
+
+class PaymentRequiredError(BillingError):
+    api_error = ApiError(code=402, msg="Payment Required", desc="...", err_code="BILLING-402")
+
+class SubscriptionExpiredError(BillingError):
+    api_error = ApiError(code=402, msg="Subscription Expired", desc="...", err_code="BILLING-402-EXP")
+```
+
 ## OpenAPI response documentation
 
 Use [`generate_error_responses`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.generate_error_responses) to add error schemas to your endpoint's OpenAPI spec:
@@ -78,8 +124,7 @@ from fastapi_toolsets.exceptions import generate_error_responses, NotFoundError,
 async def get_user(...): ...
 ```
 
-!!! info
+Multiple exceptions sharing the same HTTP status code are grouped under one entry, each appearing as a named example keyed by its `err_code`. This keeps the OpenAPI UI readable when several error variants map to the same status.
-    The pydantic validation error is automatically added by FastAPI.
 
 ---
 

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/metrics.md

@@ -36,7 +36,13 @@ This mounts the `/metrics` endpoint that Prometheus can scrape.
 
 ### Providers
 
-Providers are called once at startup and register metrics that are updated externally (e.g. counters, histograms):
+Providers are called once at startup by `init_metrics`. The return value (the Prometheus metric object) is stored in the registry and can be retrieved later with [`registry.get(name)`](../reference/metrics.md#fastapi_toolsets.metrics.registry.MetricsRegistry.get).
+
+Use providers when you want **deferred initialization**: the Prometheus metric is not registered with the global `CollectorRegistry` until `init_metrics` runs, not at import time. This is particularly useful for testing — importing the module in a test suite without calling `init_metrics` leaves no metrics registered, avoiding cross-test pollution.
+
+It is also useful when metrics are defined across multiple modules and merged with `include_registry`: any code that needs a metric can call `metrics.get()` on the shared registry instead of importing the metric directly from its origin module.
+
+If neither of these applies to you, declaring metrics at module level (e.g. `HTTP_REQUESTS = Counter(...)`) is simpler and equally valid.
 
 ```python
 from prometheus_client import Counter, Histogram
@@ -50,15 +56,32 @@ def request_duration():
     return Histogram("request_duration_seconds", "Request duration")
 ```
 
-### Collectors
+To use a provider's metric elsewhere (e.g. in a middleware), call `metrics.get()` inside the handler — **not** at module level, as providers are only initialized when `init_metrics` runs:
-
-Collectors are called on every scrape. Use them for metrics that reflect current state (e.g. gauges):
 
 ```python
+async def metrics_middleware(request: Request, call_next):
+    response = await call_next(request)
+    metrics.get("http_requests").labels(
+        method=request.method, status=response.status_code
+    ).inc()
+    return response
+```
+
+### Collectors
+
+Collectors are called on every scrape. Use them for metrics that reflect current state (e.g. gauges).
+
+!!! warning "Declare the metric at module level"
+    Do **not** instantiate the Prometheus metric inside the collector function. Doing so recreates it on every scrape, raising `ValueError: Duplicated timeseries in CollectorRegistry`. Declare it once at module level instead:
+
+```python
+from prometheus_client import Gauge
+
+_queue_depth = Gauge("queue_depth", "Current queue depth")
+
 @metrics.register(collect=True)
-def queue_depth():
+def collect_queue_depth():
-    gauge = Gauge("queue_depth", "Current queue depth")
+    _queue_depth.set(get_current_queue_depth())
-    gauge.set(get_current_queue_depth())
 ```
 
 ## Merging registries

docs/module/models.md

@@ -0,0 +1,255 @@
+# Models
+
+!!! info "Added in `v2.0`"
+
+Reusable SQLAlchemy 2.0 mixins for common column patterns, designed to be composed freely on any `DeclarativeBase` model.
+
+## Overview
+
+The `models` module provides mixins that each add a single, well-defined column behaviour. They work with standard SQLAlchemy 2.0 declarative syntax and are fully compatible with `AsyncSession`.
+
+```python
+from fastapi_toolsets.models import UUIDMixin, TimestampMixin
+
+class Article(Base, UUIDMixin, TimestampMixin):
+    __tablename__ = "articles"
+
+    title: Mapped[str]
+    content: Mapped[str]
+```
+
+All timestamp columns are timezone-aware (`TIMESTAMPTZ`). All defaults are server-side (`clock_timestamp()`), so they are also applied when inserting rows via raw SQL outside the ORM.
+
+## Mixins
+
+### [`UUIDMixin`](../reference/models.md#fastapi_toolsets.models.UUIDMixin)
+
+Adds a `id: UUID` primary key generated server-side by PostgreSQL using `gen_random_uuid()`. The value is retrieved via `RETURNING` after insert, so it is available on the Python object immediately after `flush()`.
+
+!!! warning "Requires PostgreSQL 13+"
+
+```python
+from fastapi_toolsets.models import UUIDMixin
+
+class User(Base, UUIDMixin):
+    __tablename__ = "users"
+
+    username: Mapped[str]
+
+# id is None before flush
+user = User(username="alice")
+session.add(user)
+await session.flush()
+print(user.id)  # UUID('...')
+```
+
+### [`UUIDv7Mixin`](../reference/models.md#fastapi_toolsets.models.UUIDv7Mixin)
+
+!!! info "Added in `v2.3`"
+
+Adds a `id: UUID` primary key generated server-side by PostgreSQL using `uuidv7()`. It's a time-ordered UUID format that encodes a millisecond-precision timestamp in the most significant bits, making it naturally sortable and index-friendly.
+
+!!! warning "Requires PostgreSQL 18+"
+
+```python
+from fastapi_toolsets.models import UUIDv7Mixin
+
+class Event(Base, UUIDv7Mixin):
+    __tablename__ = "events"
+
+    name: Mapped[str]
+
+# id is None before flush
+event = Event(name="user.signup")
+session.add(event)
+await session.flush()
+print(event.id)  # UUID('019...')
+```
+
+### [`CreatedAtMixin`](../reference/models.md#fastapi_toolsets.models.CreatedAtMixin)
+
+Adds a `created_at: datetime` column set to `clock_timestamp()` on insert. The column has no `onupdate` hook — it is intentionally immutable after the row is created.
+
+```python
+from fastapi_toolsets.models import UUIDMixin, CreatedAtMixin
+
+class Order(Base, UUIDMixin, CreatedAtMixin):
+    __tablename__ = "orders"
+
+    total: Mapped[float]
+```
+
+### [`UpdatedAtMixin`](../reference/models.md#fastapi_toolsets.models.UpdatedAtMixin)
+
+Adds an `updated_at: datetime` column set to `clock_timestamp()` on insert and automatically updated to `clock_timestamp()` on every ORM-level update (via SQLAlchemy's `onupdate` hook).
+
+```python
+from fastapi_toolsets.models import UUIDMixin, UpdatedAtMixin
+
+class Post(Base, UUIDMixin, UpdatedAtMixin):
+    __tablename__ = "posts"
+
+    title: Mapped[str]
+
+post = Post(title="Hello")
+await session.flush()
+await session.refresh(post)
+
+post.title = "Hello World"
+await session.flush()
+await session.refresh(post)
+print(post.updated_at)
+```
+
+!!! note
+    `updated_at` is updated by SQLAlchemy at ORM flush time. If you update rows via raw SQL (e.g. `UPDATE posts SET ...`), the column will **not** be updated automatically — use a database trigger if you need that guarantee.
+
+### [`TimestampMixin`](../reference/models.md#fastapi_toolsets.models.TimestampMixin)
+
+Convenience mixin that combines [`CreatedAtMixin`](../reference/models.md#fastapi_toolsets.models.CreatedAtMixin) and [`UpdatedAtMixin`](../reference/models.md#fastapi_toolsets.models.UpdatedAtMixin). Equivalent to inheriting both.
+
+```python
+from fastapi_toolsets.models import UUIDMixin, TimestampMixin
+
+class Article(Base, UUIDMixin, TimestampMixin):
+    __tablename__ = "articles"
+
+    title: Mapped[str]
+```
+
+### [`WatchedFieldsMixin`](../reference/models.md#fastapi_toolsets.models.WatchedFieldsMixin)
+
+!!! info "Added in `v2.4`"
+
+`WatchedFieldsMixin` provides lifecycle callbacks that fire **after commit** — meaning the row is durably persisted when your callback runs. If the transaction rolls back, no callback fires.
+
+Three callbacks are available, each corresponding to a [`ModelEvent`](../reference/models.md#fastapi_toolsets.models.ModelEvent) value:
+
+| Callback | Event | Trigger |
+|---|---|---|
+| `on_create()` | `ModelEvent.CREATE` | After `INSERT` |
+| `on_delete()` | `ModelEvent.DELETE` | After `DELETE` |
+| `on_update(changes)` | `ModelEvent.UPDATE` | After `UPDATE` on a watched field |
+
+Server-side defaults (e.g. `id`, `created_at`) are fully populated in all callbacks. All callbacks support both `async def` and plain `def`. Use `@watch` to restrict which fields trigger `on_update`:
+
+| Decorator | `on_update` behaviour |
+|---|---|
+| `@watch("status", "role")` | Only fires when `status` or `role` changes |
+| *(no decorator)* | Fires when **any** mapped field changes |
+
+`@watch` is inherited through the class hierarchy. If a subclass does not declare its own `@watch`, it uses the filter from the nearest decorated parent. Applying `@watch` on the subclass overrides the parent's filter:
+
+```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:
+
+```python
+from fastapi_toolsets.models import ModelEvent, UUIDMixin, WatchedFieldsMixin, watch
+
+@watch("status")
+class Order(Base, UUIDMixin, WatchedFieldsMixin):
+    __tablename__ = "orders"
+
+    status: Mapped[str]
+
+    async def on_event(self, event: ModelEvent, changes: dict | None = None) -> None:
+        if event == ModelEvent.CREATE:
+            await notify_new_order(self.id)
+        elif event == ModelEvent.DELETE:
+            await notify_order_cancelled(self.id)
+        elif event == ModelEvent.UPDATE:
+            await notify_status_change(self.id, changes["status"])
+```
+
+#### Option 2 — targeted overrides
+
+Override individual methods for more focused logic:
+
+```python
+@watch("status")
+class Order(Base, UUIDMixin, WatchedFieldsMixin):
+    __tablename__ = "orders"
+
+    status: Mapped[str]
+
+    async def on_create(self) -> None:
+        await notify_new_order(self.id)
+
+    async def on_delete(self) -> None:
+        await notify_order_cancelled(self.id)
+
+    async def on_update(self, changes: dict) -> None:
+        if "status" in changes:
+            old = changes["status"]["old"]
+            new = changes["status"]["new"]
+            await notify_status_change(self.id, old, new)
+```
+
+#### Field changes format
+
+The `changes` dict maps each watched field that changed to `{"old": ..., "new": ...}`. Only fields that actually changed are included:
+
+```python
+# status changed   → {"status": {"old": "pending", "new": "shipped"}}
+# two fields changed → {"status": {...}, "assigned_to": {...}}
+```
+
+!!! info "Multiple flushes in one transaction are merged: the earliest `old` and latest `new` are preserved, and `on_update` fires only once per commit."
+
+!!! warning "Callbacks fire only for ORM-level changes. Rows updated via raw SQL (`UPDATE ... SET ...`) are not detected."
+
+!!! warning "Callbacks fire when the **outermost active context** (savepoint or transaction) commits."
+    If you create several related objects using `CrudFactory.create` and need
+    callbacks to see all of them (including associations), wrap the whole
+    operation in a single [`get_transaction`](db.md) or [`lock_tables`](db.md)
+    block. Without it, each `create` call commits its own savepoint and
+    `on_create` fires before the remaining objects exist.
+
+    ```python
+    from fastapi_toolsets.db import get_transaction
+
+    async with get_transaction(session):
+        order = await OrderCrud.create(session, order_data)
+        item  = await ItemCrud.create(session, item_data)
+        await session.refresh(order, attribute_names=["items"])
+        order.items.append(item)
+    # on_create fires here for both order and item,
+    # with the full association already committed.
+    ```
+
+## Composing mixins
+
+All mixins can be combined in any order. The only constraint is that exactly one primary key must be defined — either via `UUIDMixin` or directly on the model.
+
+```python
+from fastapi_toolsets.models import UUIDMixin, TimestampMixin
+
+class Event(Base, UUIDMixin, TimestampMixin):
+    __tablename__ = "events"
+    name: Mapped[str]
+
+class Counter(Base, UpdatedAtMixin):
+    __tablename__ = "counters"
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    value: Mapped[int]
+```
+
+---
+
+[:material-api: API Reference](../reference/models.md)

docs/module/pytest.md

@@ -40,10 +40,10 @@ async def http_client(db_session):
 
 ## Database sessions in tests
 
-Use [`create_db_session`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_db_session) to create an isolated `AsyncSession` for a test:
+Use [`create_db_session`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_db_session) to create an isolated `AsyncSession` for a test, combined with [`create_worker_database`](../reference/pytest.md#fastapi_toolsets.pytest.utils.create_worker_database) to set up a per-worker database:
 
 ```python
-from fastapi_toolsets.pytest import create_db_session, create_worker_database
+from fastapi_toolsets.pytest import create_worker_database, create_db_session
 
 @pytest.fixture(scope="session")
 async def worker_db_url():
@@ -64,16 +64,28 @@ async def db_session(worker_db_url):
 !!! info
     In this example, the database is reset between each test using the argument `cleanup=True`.
 
+Use [`worker_database_url`](../reference/pytest.md#fastapi_toolsets.pytest.utils.worker_database_url) to derive the per-worker URL manually if needed:
+
+```python
+from fastapi_toolsets.pytest import worker_database_url
+
+url = worker_database_url("postgresql+asyncpg://user:pass@localhost/test_db", default_test_db="test")
+# e.g. "postgresql+asyncpg://user:pass@localhost/test_db_gw0" under xdist
+```
+
 ## Parallel testing with pytest-xdist
 
 The examples above are already compatible with parallel test execution with `pytest-xdist`.
 
 ## Cleaning up tables
 
-If you want to manually clean up a database you can use [`cleanup_tables`](../reference/pytest.md#fastapi_toolsets.pytest.utils.cleanup_tables), this will truncates all tables between tests for fast isolation:
+!!! warning
+    Since `V2.1.0` `cleanup_tables` now live in `fastapi_toolsets.db`. For backward compatibility the function is still available in `fastapi_toolsets.pytest`, but this will be remove in `V3.0.0`.
+
+If you want to manually clean up a database you can use [`cleanup_tables`](../reference/db.md#fastapi_toolsets.db.cleanup_tables), this will truncate all tables between tests for fast isolation:
 
 ```python
-from fastapi_toolsets.pytest import cleanup_tables
+from fastapi_toolsets.db import cleanup_tables
 
 @pytest.fixture(autouse=True)
 async def clean(db_session):

docs/module/schemas.md

@@ -20,26 +20,115 @@ async def get_user(user: User = UserDep) -> Response[UserSchema]:
     return Response(data=user, message="User retrieved")
 ```
 
-### [`PaginatedResponse[T]`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse)
+### Paginated response models
 
-Wraps a list of items with pagination metadata and optional facet values.
+Three classes wrap paginated list results. Pick the one that matches your endpoint's strategy:
+
+| Class | `pagination` type | `pagination_type` field | Use when |
+|---|---|---|---|
+| [`OffsetPaginatedResponse[T]`](#offsetpaginatedresponset) | `OffsetPagination` | `"offset"` (fixed) | endpoint always uses offset |
+| [`CursorPaginatedResponse[T]`](#cursorpaginatedresponset) | `CursorPagination` | `"cursor"` (fixed) | endpoint always uses cursor |
+| [`PaginatedResponse[T]`](#paginatedresponset) | `OffsetPagination \| CursorPagination` | — | unified endpoint supporting both strategies |
+
+#### [`OffsetPaginatedResponse[T]`](../reference/schemas.md#fastapi_toolsets.schemas.OffsetPaginatedResponse)
+
+!!! info "Added in `v2.3.0`"
+
+Use as the return type when the endpoint always uses [`offset_paginate`](crud.md#offset-pagination).  The `pagination` field is guaranteed to be an [`OffsetPagination`](../reference/schemas.md#fastapi_toolsets.schemas.OffsetPagination) object; the response always includes a `pagination_type: "offset"` discriminator.
 
 ```python
-from fastapi_toolsets.schemas import PaginatedResponse, Pagination
+from fastapi_toolsets.schemas import OffsetPaginatedResponse
 
 @router.get("/users")
-async def list_users() -> PaginatedResponse[UserSchema]:
+async def list_users(
-    return PaginatedResponse(
+    page: int = 1,
-        data=users,
+    items_per_page: int = 20,
-        pagination=Pagination(
+) -> OffsetPaginatedResponse[UserSchema]:
-            total_count=100,
+    return await UserCrud.offset_paginate(
-            items_per_page=10,
+        session, page=page, items_per_page=items_per_page, schema=UserSchema
-            page=1,
-            has_more=True,
-        ),
     )
 ```
 
+**Response shape:**
+
+```json
+{
+  "status": "SUCCESS",
+  "pagination_type": "offset",
+  "data": ["..."],
+  "pagination": {
+    "total_count": 100,
+    "page": 1,
+    "items_per_page": 20,
+    "has_more": true
+  }
+}
+```
+
+#### [`CursorPaginatedResponse[T]`](../reference/schemas.md#fastapi_toolsets.schemas.CursorPaginatedResponse)
+
+!!! info "Added in `v2.3.0`"
+
+Use as the return type when the endpoint always uses [`cursor_paginate`](crud.md#cursor-pagination).  The `pagination` field is guaranteed to be a [`CursorPagination`](../reference/schemas.md#fastapi_toolsets.schemas.CursorPagination) object; the response always includes a `pagination_type: "cursor"` discriminator.
+
+```python
+from fastapi_toolsets.schemas import CursorPaginatedResponse
+
+@router.get("/events")
+async def list_events(
+    cursor: str | None = None,
+    items_per_page: int = 20,
+) -> CursorPaginatedResponse[EventSchema]:
+    return await EventCrud.cursor_paginate(
+        session, cursor=cursor, items_per_page=items_per_page, schema=EventSchema
+    )
+```
+
+**Response shape:**
+
+```json
+{
+  "status": "SUCCESS",
+  "pagination_type": "cursor",
+  "data": ["..."],
+  "pagination": {
+    "next_cursor": "eyJpZCI6IDQyfQ==",
+    "prev_cursor": null,
+    "items_per_page": 20,
+    "has_more": true
+  }
+}
+```
+
+#### [`PaginatedResponse[T]`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse)
+
+Return type for endpoints that support **both** pagination strategies via a `pagination_type` query parameter (using [`paginate()`](crud.md#unified-paginate--both-strategies-on-one-endpoint)).
+
+When used as a return annotation, `PaginatedResponse[T]` automatically expands to `Annotated[Union[CursorPaginatedResponse[T], OffsetPaginatedResponse[T]], Field(discriminator="pagination_type")]`, so FastAPI emits a proper `oneOf` + discriminator in the OpenAPI schema with no extra boilerplate:
+
+```python
+from fastapi_toolsets.crud import PaginationType
+from fastapi_toolsets.schemas import PaginatedResponse
+
+@router.get("/users")
+async def list_users(
+    pagination_type: PaginationType = PaginationType.OFFSET,
+    page: int = 1,
+    cursor: str | None = None,
+    items_per_page: int = 20,
+) -> PaginatedResponse[UserSchema]:
+    return await UserCrud.paginate(
+        session,
+        pagination_type=pagination_type,
+        page=page,
+        cursor=cursor,
+        items_per_page=items_per_page,
+        schema=UserSchema,
+    )
+```
+
+#### Pagination metadata models
+
 The optional `filter_attributes` field is populated when `facet_fields` are configured on the CRUD class (see [Filter attributes](crud.md#filter-attributes-facets)). It is `None` by default and can be hidden from API responses with `response_model_exclude_none=True`.
 
 ### [`ErrorResponse`](../reference/schemas.md#fastapi_toolsets.schemas.ErrorResponse)

docs/reference/db.md

@@ -7,6 +7,8 @@ You can import them directly from `fastapi_toolsets.db`:
 ```python
 from fastapi_toolsets.db import (
     LockMode,
+    cleanup_tables,
+    create_database,
     create_db_dependency,
     create_db_context,
     get_transaction,
@@ -26,3 +28,7 @@ from fastapi_toolsets.db import (
 ## ::: fastapi_toolsets.db.lock_tables
 
 ## ::: fastapi_toolsets.db.wait_for_row_change
+
+## ::: fastapi_toolsets.db.create_database
+
+## ::: fastapi_toolsets.db.cleanup_tables

docs/reference/models.md

@@ -0,0 +1,34 @@
+# `models`
+
+Here's the reference for the SQLAlchemy model mixins provided by the `models` module.
+
+You can import them directly from `fastapi_toolsets.models`:
+
+```python
+from fastapi_toolsets.models import (
+    ModelEvent,
+    UUIDMixin,
+    UUIDv7Mixin,
+    CreatedAtMixin,
+    UpdatedAtMixin,
+    TimestampMixin,
+    WatchedFieldsMixin,
+    watch,
+)
+```
+
+## ::: fastapi_toolsets.models.ModelEvent
+
+## ::: fastapi_toolsets.models.UUIDMixin
+
+## ::: fastapi_toolsets.models.UUIDv7Mixin
+
+## ::: fastapi_toolsets.models.CreatedAtMixin
+
+## ::: fastapi_toolsets.models.UpdatedAtMixin
+
+## ::: fastapi_toolsets.models.TimestampMixin
+
+## ::: fastapi_toolsets.models.WatchedFieldsMixin
+
+## ::: fastapi_toolsets.models.watch

docs/reference/pytest.md

@@ -24,5 +24,3 @@ from fastapi_toolsets.pytest import (
 ## ::: fastapi_toolsets.pytest.utils.worker_database_url
 
 ## ::: fastapi_toolsets.pytest.utils.create_worker_database
-
-## ::: fastapi_toolsets.pytest.utils.cleanup_tables

docs/reference/schemas.md

@@ -1,4 +1,4 @@
-# `schemas` module
+# `schemas`
 
 Here's the reference for all response models and types provided by the `schemas` module.
 
@@ -12,8 +12,12 @@ from fastapi_toolsets.schemas import (
     BaseResponse,
     Response,
     ErrorResponse,
-    Pagination,
+    OffsetPagination,
+    CursorPagination,
+    PaginationType,
     PaginatedResponse,
+    OffsetPaginatedResponse,
+    CursorPaginatedResponse,
 )
 ```
 
@@ -29,6 +33,14 @@ from fastapi_toolsets.schemas import (
 
 ## ::: fastapi_toolsets.schemas.ErrorResponse
 
-## ::: fastapi_toolsets.schemas.Pagination
+## ::: fastapi_toolsets.schemas.OffsetPagination
+
+## ::: fastapi_toolsets.schemas.CursorPagination
+
+## ::: fastapi_toolsets.schemas.PaginationType
 
 ## ::: fastapi_toolsets.schemas.PaginatedResponse
+
+## ::: fastapi_toolsets.schemas.OffsetPaginatedResponse
+
+## ::: fastapi_toolsets.schemas.CursorPaginatedResponse

docs_src/examples/pagination_search/models.py

@@ -1,9 +1,10 @@
-import datetime
 import uuid
 
-from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text, func
+from sqlalchemy import Boolean, ForeignKey, String, Text
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
+from fastapi_toolsets.models import CreatedAtMixin
+
 
 class Base(DeclarativeBase):
     pass
@@ -18,13 +19,10 @@ class Category(Base):
     articles: Mapped[list["Article"]] = relationship(back_populates="category")
 
 
-class Article(Base):
+class Article(Base, CreatedAtMixin):
     __tablename__ = "articles"
 
     id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
-    created_at: Mapped[datetime.datetime] = mapped_column(
-        DateTime(timezone=True), server_default=func.now()
-    )
     title: Mapped[str] = mapped_column(String(256))
     body: Mapped[str] = mapped_column(Text)
     status: Mapped[str] = mapped_column(String(32))

docs_src/examples/pagination_search/routes.py

@@ -1,9 +1,13 @@
 from typing import Annotated
 
-from fastapi import APIRouter, Depends, Query
+from fastapi import APIRouter, Depends
 
 from fastapi_toolsets.crud import OrderByClause
-from fastapi_toolsets.schemas import PaginatedResponse
+from fastapi_toolsets.schemas import (
+    CursorPaginatedResponse,
+    OffsetPaginatedResponse,
+    PaginatedResponse,
+)
 
 from .crud import ArticleCrud
 from .db import SessionDep
@@ -16,19 +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,
-) -> PaginatedResponse[ArticleRead]:
+) -> 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,
@@ -39,19 +44,44 @@ 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,
-) -> PaginatedResponse[ArticleRead]:
+) -> 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,
+        schema=ArticleRead,
+    )
+
+
+@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)),
+    ],
+    search: str | None = None,
+) -> PaginatedResponse[ArticleRead]:
+    return await ArticleCrud.paginate(
+        session,
+        **params,
         search=search,
         filter_by=filter_by or None,
         order_by=order_by,

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "fastapi-toolsets"
-version = "1.3.0"
+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__ = "1.3.0"
+__version__ = "2.4.3"

src/fastapi_toolsets/cli/commands/fixtures.py

@@ -72,7 +72,7 @@ async def load(
     registry = get_fixtures_registry()
     db_context = get_db_context()
 
-    context_list = [c.value for c in contexts] if contexts else [Context.BASE]
+    context_list = list(contexts) if contexts else [Context.BASE]
 
     ordered = registry.resolve_context_dependencies(*context_list)
 

src/fastapi_toolsets/crud/__init__.py

@@ -1,14 +1,19 @@
 """Generic async CRUD operations for SQLAlchemy models."""
 
 from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
-from .factory import CrudFactory, JoinType, M2MFieldType, OrderByClause
+from ..schemas import PaginationType
-from .search import (
+from ..types import (
     FacetFieldType,
-    SearchConfig,
+    JoinType,
-    get_searchable_fields,
+    M2MFieldType,
+    OrderByClause,
+    SearchFieldType,
 )
+from .factory import AsyncCrud, CrudFactory
+from .search import SearchConfig, get_searchable_fields
 
 __all__ = [
+    "AsyncCrud",
     "CrudFactory",
     "FacetFieldType",
     "get_searchable_fields",
@@ -17,5 +22,7 @@ __all__ = [
     "M2MFieldType",
     "NoSearchableFieldsError",
     "OrderByClause",
+    "PaginationType",
     "SearchConfig",
+    "SearchFieldType",
 ]

src/fastapi_toolsets/crud/search.py

@@ -1,24 +1,22 @@
 """Search utilities for AsyncCrud."""
 
 import asyncio
-from collections import Counter
+import functools
 from collections.abc import Sequence
-from dataclasses import dataclass
+from dataclasses import dataclass, replace
 from typing import TYPE_CHECKING, Any, Literal
 
-from sqlalchemy import String, or_, select
+from sqlalchemy import String, and_, or_, select
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 from sqlalchemy.orm.attributes import InstrumentedAttribute
 
 from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
+from ..types import FacetFieldType, SearchFieldType
 
 if TYPE_CHECKING:
     from sqlalchemy.sql.elements import ColumnElement
 
-SearchFieldType = InstrumentedAttribute[Any] | tuple[InstrumentedAttribute[Any], ...]
-FacetFieldType = SearchFieldType
-
 
 @dataclass
 class SearchConfig:
@@ -37,6 +35,7 @@ class SearchConfig:
     match_mode: Literal["any", "all"] = "any"
 
 
+@functools.lru_cache(maxsize=128)
 def get_searchable_fields(
     model: type[DeclarativeBase],
     *,
@@ -101,14 +100,11 @@ def build_search_filters(
     if isinstance(search, str):
         config = SearchConfig(query=search, fields=search_fields)
     else:
-        config = search
+        config = (
-        if search_fields is not None:
+            replace(search, fields=search_fields)
-            config = SearchConfig(
+            if search_fields is not None
-                query=config.query,
+            else search
-                fields=search_fields,
+        )
-                case_sensitive=config.case_sensitive,
-                match_mode=config.match_mode,
-            )
 
     if not config.query or not config.query.strip():
         return [], []
@@ -154,7 +150,7 @@ def build_search_filters(
 
 
 def facet_keys(facet_fields: Sequence[FacetFieldType]) -> list[str]:
-    """Return a key for each facet field, disambiguating duplicate column keys.
+    """Return a key for each facet field.
 
     Args:
         facet_fields: Sequence of facet fields — either direct columns or
@@ -163,22 +159,12 @@ def facet_keys(facet_fields: Sequence[FacetFieldType]) -> list[str]:
     Returns:
         A list of string keys, one per facet field, in the same order.
     """
-    raw: list[tuple[str, str | None]] = []
+    keys: list[str] = []
     for field in facet_fields:
         if isinstance(field, tuple):
-            rel = field[-2]
+            keys.append("__".join(el.key for el in field))
-            column = field[-1]
-            raw.append((column.key, rel.key))
         else:
-            raw.append((field.key, None))
+            keys.append(field.key)
-
-    counts = Counter(col_key for col_key, _ in raw)
-    keys: list[str] = []
-    for col_key, rel_key in raw:
-        if counts[col_key] > 1 and rel_key is not None:
-            keys.append(f"{rel_key}__{col_key}")
-        else:
-            keys.append(col_key)
     return keys
 
 
@@ -227,8 +213,6 @@ async def build_facets(
                 q = q.outerjoin(rel)
 
         if base_filters:
-            from sqlalchemy import and_
-
             q = q.where(and_(*base_filters))
 
         q = q.order_by(column)

src/fastapi_toolsets/db.py

@@ -7,15 +7,19 @@ from enum import Enum
 from typing import Any, TypeVar
 
 from sqlalchemy import text
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 from sqlalchemy.orm import DeclarativeBase
 
+from .exceptions import NotFoundError
+
 __all__ = [
     "LockMode",
+    "cleanup_tables",
+    "create_database",
     "create_db_context",
     "create_db_dependency",
-    "lock_tables",
     "get_transaction",
+    "lock_tables",
     "wait_for_row_change",
 ]
 
@@ -52,6 +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()
@@ -186,6 +191,71 @@ async def lock_tables(
         yield session
 
 
+async def create_database(
+    db_name: str,
+    *,
+    server_url: str,
+) -> None:
+    """Create a database.
+
+    Connects to *server_url* using ``AUTOCOMMIT`` isolation and issues a
+    ``CREATE DATABASE`` statement for *db_name*.
+
+    Args:
+        db_name: Name of the database to create.
+        server_url: URL used for server-level DDL (must point to an existing
+            database on the same server).
+
+    Example:
+        ```python
+        from fastapi_toolsets.db import create_database
+
+        SERVER_URL = "postgresql+asyncpg://postgres:postgres@localhost/postgres"
+        await create_database("myapp_test", server_url=SERVER_URL)
+        ```
+    """
+    engine = create_async_engine(server_url, isolation_level="AUTOCOMMIT")
+    try:
+        async with engine.connect() as conn:
+            await conn.execute(text(f"CREATE DATABASE {db_name}"))
+    finally:
+        await engine.dispose()
+
+
+async def cleanup_tables(
+    session: AsyncSession,
+    base: type[DeclarativeBase],
+) -> None:
+    """Truncate all tables for fast between-test cleanup.
+
+    Executes a single ``TRUNCATE … RESTART IDENTITY CASCADE`` statement
+    across every table in *base*'s metadata, which is significantly faster
+    than dropping and re-creating tables between tests.
+
+    This is a no-op when the metadata contains no tables.
+
+    Args:
+        session: An active async database session.
+        base: SQLAlchemy DeclarativeBase class containing model metadata.
+
+    Example:
+        ```python
+        @pytest.fixture
+        async def db_session(worker_db_url):
+            async with create_db_session(worker_db_url, Base) as session:
+                yield session
+                await cleanup_tables(session, Base)
+        ```
+    """
+    tables = base.metadata.sorted_tables
+    if not tables:
+        return
+
+    table_names = ", ".join(f'"{t.name}"' for t in tables)
+    await session.execute(text(f"TRUNCATE {table_names} RESTART IDENTITY CASCADE"))
+    await session.commit()
+
+
 _M = TypeVar("_M", bound=DeclarativeBase)
 
 
@@ -216,7 +286,7 @@ async def wait_for_row_change(
         The refreshed model instance with updated values
 
     Raises:
-        LookupError: If the row does not exist or is deleted during polling
+        NotFoundError: If the row does not exist or is deleted during polling
         TimeoutError: If timeout expires before a change is detected
 
     Example:
@@ -237,7 +307,7 @@ async def wait_for_row_change(
     """
     instance = await session.get(model, pk_value)
     if instance is None:
-        raise LookupError(f"{model.__name__} with pk={pk_value!r} not found")
+        raise NotFoundError(f"{model.__name__} with pk={pk_value!r} not found")
 
     if columns is not None:
         watch_cols = columns
@@ -261,7 +331,7 @@ async def wait_for_row_change(
         instance = await session.get(model, pk_value)
 
         if instance is None:
-            raise LookupError(f"{model.__name__} with pk={pk_value!r} was deleted")
+            raise NotFoundError(f"{model.__name__} with pk={pk_value!r} was deleted")
 
         current = {col: getattr(instance, col) for col in watch_cols}
         if current != initial:

src/fastapi_toolsets/dependencies.py

@@ -1,19 +1,27 @@
 """Dependency factories for FastAPI routes."""
 
 import inspect
-from collections.abc import AsyncGenerator, Callable
+import typing
-from typing import Any, TypeVar, cast
+from collections.abc import Callable
+from typing import Any, cast
 
 from fastapi import Depends
+from fastapi.params import Depends as DependsClass
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy.orm import DeclarativeBase
 
 from .crud import CrudFactory
+from .types import ModelType, SessionDependency
 
 __all__ = ["BodyDependency", "PathDependency"]
 
-ModelType = TypeVar("ModelType", bound=DeclarativeBase)
+
-SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]]
+def _unwrap_session_dep(session_dep: SessionDependency) -> Callable[..., Any]:
+    """Extract the plain callable from ``Annotated[AsyncSession, Depends(fn)]`` if needed."""
+    if typing.get_origin(session_dep) is typing.Annotated:
+        for arg in typing.get_args(session_dep)[1:]:
+            if isinstance(arg, DependsClass):
+                return arg.dependency
+    return session_dep
 
 
 def PathDependency(
@@ -47,6 +55,7 @@ def PathDependency(
         ): ...
         ```
     """
+    session_callable = _unwrap_session_dep(session_dep)
     crud = CrudFactory(model)
     name = (
         param_name
@@ -56,7 +65,7 @@ def PathDependency(
     python_type = field.type.python_type
 
     async def dependency(
-        session: AsyncSession = Depends(session_dep), **kwargs: Any
+        session: AsyncSession = Depends(session_callable), **kwargs: Any
     ) -> ModelType:
         value = kwargs[name]
         return await crud.get(session, filters=[field == value])
@@ -73,7 +82,7 @@ def PathDependency(
                     "session",
                     inspect.Parameter.KEYWORD_ONLY,
                     annotation=AsyncSession,
-                    default=Depends(session_dep),
+                    default=Depends(session_callable),
                 ),
             ]
         ),
@@ -115,11 +124,12 @@ def BodyDependency(
         ): ...
         ```
     """
+    session_callable = _unwrap_session_dep(session_dep)
     crud = CrudFactory(model)
     python_type = field.type.python_type
 
     async def dependency(
-        session: AsyncSession = Depends(session_dep), **kwargs: Any
+        session: AsyncSession = Depends(session_callable), **kwargs: Any
     ) -> ModelType:
         value = kwargs[body_field]
         return await crud.get(session, filters=[field == value])
@@ -136,7 +146,7 @@ def BodyDependency(
                     "session",
                     inspect.Parameter.KEYWORD_ONLY,
                     annotation=AsyncSession,
-                    default=Depends(session_dep),
+                    default=Depends(session_callable),
                 ),
             ]
         ),

src/fastapi_toolsets/exceptions/exceptions.py

@@ -6,32 +6,46 @@ from ..schemas import ApiError, ErrorResponse, ResponseStatus
 
 
 class ApiException(Exception):
-    """Base exception for API errors with structured response.
+    """Base exception for API errors with structured response."""
-
-    Subclass this to create custom API exceptions with consistent error format.
-    The exception handler will use api_error to generate the response.
-
-    Example:
-        ```python
-        class CustomError(ApiException):
-            api_error = ApiError(
-                code=400,
-                msg="Bad Request",
-                desc="The request was invalid.",
-                err_code="CUSTOM-400",
-            )
-        ```
-    """
 
     api_error: ClassVar[ApiError]
 
-    def __init__(self, detail: str | None = None):
+    def __init_subclass__(cls, abstract: bool = False, **kwargs: Any) -> None:
+        super().__init_subclass__(**kwargs)
+        if not abstract and not hasattr(cls, "api_error"):
+            raise TypeError(
+                f"{cls.__name__} must define an 'api_error' class attribute. "
+                "Pass abstract=True when creating intermediate base classes."
+            )
+
+    def __init__(
+        self,
+        detail: str | None = None,
+        *,
+        desc: str | None = None,
+        data: Any = None,
+    ) -> None:
         """Initialize the exception.
 
         Args:
-            detail: Optional override for the error message
+            detail: Optional human-readable message
+            desc: Optional per-instance override for the ``description`` field
+                in the HTTP response body.
+            data: Optional per-instance override for the ``data`` field in the
+                HTTP response body.
         """
-        super().__init__(detail or self.api_error.msg)
+        updates: dict[str, Any] = {}
+        if detail is not None:
+            updates["msg"] = detail
+        if desc is not None:
+            updates["desc"] = desc
+        if data is not None:
+            updates["data"] = data
+        if updates:
+            object.__setattr__(
+                self, "api_error", self.__class__.api_error.model_copy(update=updates)
+            )
+        super().__init__(self.api_error.msg)
 
 
 class UnauthorizedError(ApiException):
@@ -92,14 +106,15 @@ class NoSearchableFieldsError(ApiException):
         """Initialize the exception.
 
         Args:
-            model: The SQLAlchemy model class that has no searchable fields
+            model: The model class that has no searchable fields configured.
         """
         self.model = model
-        detail = (
+        super().__init__(
-            f"No searchable fields found for model '{model.__name__}'. "
+            desc=(
-            "Provide 'search_fields' parameter or set 'searchable_fields' on the CRUD class."
+                f"No searchable fields found for model '{model.__name__}'. "
+                "Provide 'search_fields' parameter or set 'searchable_fields' on the CRUD class."
+            )
         )
-        super().__init__(detail)
 
 
 class InvalidFacetFilterError(ApiException):
@@ -116,16 +131,17 @@ class InvalidFacetFilterError(ApiException):
         """Initialize the exception.
 
         Args:
-            key: The unknown filter key provided by the caller
+            key: The unknown filter key provided by the caller.
-            valid_keys: Set of valid keys derived from the declared facet_fields
+            valid_keys: Set of valid keys derived from the declared facet_fields.
         """
         self.key = key
         self.valid_keys = valid_keys
-        detail = (
+        super().__init__(
-            f"'{key}' is not a declared facet field. "
+            desc=(
-            f"Valid keys: {sorted(valid_keys) or 'none — set facet_fields on the CRUD class'}."
+                f"'{key}' is not a declared facet field. "
+                f"Valid keys: {sorted(valid_keys) or 'none — set facet_fields on the CRUD class'}."
+            )
         )
-        super().__init__(detail)
 
 
 class InvalidOrderFieldError(ApiException):
@@ -142,15 +158,14 @@ class InvalidOrderFieldError(ApiException):
         """Initialize the exception.
 
         Args:
-            field: The unknown order field provided by the caller
+            field: The unknown order field provided by the caller.
-            valid_fields: List of valid field names
+            valid_fields: List of valid field names.
         """
         self.field = field
         self.valid_fields = valid_fields
-        detail = (
+        super().__init__(
-            f"'{field}' is not an allowed order field. Valid fields: {valid_fields}."
+            desc=f"'{field}' is not an allowed order field. Valid fields: {valid_fields}."
         )
-        super().__init__(detail)
 
 
 def generate_error_responses(
@@ -158,44 +173,39 @@ def generate_error_responses(
 ) -> dict[int | str, dict[str, Any]]:
     """Generate OpenAPI response documentation for exceptions.
 
-    Use this to document possible error responses for an endpoint.
-
     Args:
-        *errors: Exception classes that inherit from ApiException
+        *errors: Exception classes that inherit from ApiException.
 
     Returns:
-        Dict suitable for FastAPI's responses parameter
+        Dict suitable for FastAPI's ``responses`` parameter.
-
-    Example:
-        ```python
-        from fastapi_toolsets.exceptions import generate_error_responses, UnauthorizedError, ForbiddenError
-
-        @app.get(
-            "/admin",
-            responses=generate_error_responses(UnauthorizedError, ForbiddenError)
-        )
-        async def admin_endpoint():
-            ...
-        ```
     """
     responses: dict[int | str, dict[str, Any]] = {}
 
     for error in errors:
         api_error = error.api_error
+        code = api_error.code
 
-        responses[api_error.code] = {
+        if code not in responses:
-            "model": ErrorResponse,
+            responses[code] = {
-            "description": api_error.msg,
+                "model": ErrorResponse,
-            "content": {
+                "description": api_error.msg,
-                "application/json": {
+                "content": {
-                    "example": {
+                    "application/json": {
-                        "data": api_error.data,
+                        "examples": {},
-                        "status": ResponseStatus.FAIL.value,
-                        "message": api_error.msg,
-                        "description": api_error.desc,
-                        "error_code": api_error.err_code,
                     }
-                }
+                },
+            }
+
+        responses[code]["content"]["application/json"]["examples"][
+            api_error.err_code
+        ] = {
+            "summary": api_error.msg,
+            "value": {
+                "data": api_error.data,
+                "status": ResponseStatus.FAIL.value,
+                "message": api_error.msg,
+                "description": api_error.desc,
+                "error_code": api_error.err_code,
             },
         }
 

src/fastapi_toolsets/exceptions/handler.py

@@ -1,56 +1,41 @@
 """Exception handlers for FastAPI applications."""
 
+from collections.abc import Callable
 from typing import Any
 
 from fastapi import FastAPI, Request, Response, status
-from fastapi.exceptions import RequestValidationError, ResponseValidationError
+from fastapi.exceptions import (
-from fastapi.openapi.utils import get_openapi
+    HTTPException,
+    RequestValidationError,
+    ResponseValidationError,
+)
 from fastapi.responses import JSONResponse
 
 from ..schemas import ErrorResponse, ResponseStatus
 from .exceptions import ApiException
 
+_VALIDATION_LOCATION_PARAMS: frozenset[str] = frozenset(
+    {"body", "query", "path", "header", "cookie"}
+)
+
 
 def init_exceptions_handlers(app: FastAPI) -> FastAPI:
     """Register exception handlers and custom OpenAPI schema on a FastAPI app.
 
-    Installs handlers for :class:`ApiException`, validation errors, and
-    unhandled exceptions, and replaces the default 422 schema with a
-    consistent error format.
-
     Args:
-        app: FastAPI application instance
+        app: FastAPI application instance.
 
     Returns:
-        The same FastAPI instance (for chaining)
+        The same FastAPI instance (for chaining).
-
-    Example:
-        ```python
-        from fastapi import FastAPI
-        from fastapi_toolsets.exceptions import init_exceptions_handlers
-
-        app = FastAPI()
-        init_exceptions_handlers(app)
-        ```
     """
     _register_exception_handlers(app)
-    app.openapi = lambda: _custom_openapi(app)  # type: ignore[method-assign]
+    _original_openapi = app.openapi
+    app.openapi = lambda: _patched_openapi(app, _original_openapi)  # type: ignore[method-assign]  # ty:ignore[invalid-assignment]
     return app
 
 
 def _register_exception_handlers(app: FastAPI) -> None:
-    """Register all exception handlers on a FastAPI application.
+    """Register all exception handlers on a FastAPI application."""
-
-    Args:
-        app: FastAPI application instance
-
-    Example:
-        from fastapi import FastAPI
-        from fastapi_toolsets.exceptions import init_exceptions_handlers
-
-        app = FastAPI()
-        init_exceptions_handlers(app)
-    """
 
     @app.exception_handler(ApiException)
     async def api_exception_handler(request: Request, exc: ApiException) -> Response:
@@ -62,12 +47,25 @@ def _register_exception_handlers(app: FastAPI) -> None:
             description=api_error.desc,
             error_code=api_error.err_code,
         )
-
         return JSONResponse(
             status_code=api_error.code,
             content=error_response.model_dump(),
         )
 
+    @app.exception_handler(HTTPException)
+    async def http_exception_handler(request: Request, exc: HTTPException) -> Response:
+        """Handle Starlette/FastAPI HTTPException with a consistent error format."""
+        detail = exc.detail if isinstance(exc.detail, str) else "HTTP Error"
+        error_response = ErrorResponse(
+            message=detail,
+            error_code=f"HTTP-{exc.status_code}",
+        )
+        return JSONResponse(
+            status_code=exc.status_code,
+            content=error_response.model_dump(),
+            headers=getattr(exc, "headers", None),
+        )
+
     @app.exception_handler(RequestValidationError)
     async def request_validation_handler(
         request: Request, exc: RequestValidationError
@@ -90,7 +88,6 @@ def _register_exception_handlers(app: FastAPI) -> None:
             description="An unexpected error occurred. Please try again later.",
             error_code="SERVER-500",
         )
-
         return JSONResponse(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
             content=error_response.model_dump(),
@@ -105,11 +102,10 @@ def _format_validation_error(
     formatted_errors = []
 
     for error in errors:
-        field_path = ".".join(
+        locs = error["loc"]
-            str(loc)
+        if locs and locs[0] in _VALIDATION_LOCATION_PARAMS:
-            for loc in error["loc"]
+            locs = locs[1:]
-            if loc not in ("body", "query", "path", "header", "cookie")
+        field_path = ".".join(str(loc) for loc in locs)
-        )
         formatted_errors.append(
             {
                 "field": field_path or "root",
@@ -131,34 +127,22 @@ def _format_validation_error(
     )
 
 
-def _custom_openapi(app: FastAPI) -> dict[str, Any]:
+def _patched_openapi(
-    """Generate custom OpenAPI schema with standardized error format.
+    app: FastAPI, original_openapi: Callable[[], dict[str, Any]]
-
+) -> dict[str, Any]:
-    Replaces default 422 validation error responses with the custom format.
+    """Generate the OpenAPI schema and replace default 422 responses.
 
     Args:
-        app: FastAPI application instance
+        app: FastAPI application instance.
+        original_openapi: The previous ``app.openapi`` callable to delegate to.
 
     Returns:
-        OpenAPI schema dict
+        Patched OpenAPI schema dict.
-
-    Example:
-        from fastapi import FastAPI
-        from fastapi_toolsets.exceptions import init_exceptions_handlers
-
-        app = FastAPI()
-        init_exceptions_handlers(app)  # Automatically sets custom OpenAPI
     """
     if app.openapi_schema:
         return app.openapi_schema
 
-    openapi_schema = get_openapi(
+    openapi_schema = original_openapi()
-        title=app.title,
-        version=app.version,
-        openapi_version=app.openapi_version,
-        description=app.description,
-        routes=app.routes,
-    )
 
     for path_data in openapi_schema.get("paths", {}).values():
         for operation in path_data.values():
@@ -168,20 +152,25 @@ def _custom_openapi(app: FastAPI) -> dict[str, Any]:
                         "description": "Validation Error",
                         "content": {
                             "application/json": {
-                                "example": {
+                                "examples": {
-                                    "data": {
+                                    "VAL-422": {
-                                        "errors": [
+                                        "summary": "Validation Error",
-                                            {
+                                        "value": {
-                                                "field": "field_name",
+                                            "data": {
-                                                "message": "value is not valid",
+                                                "errors": [
-                                                "type": "value_error",
+                                                    {
-                                            }
+                                                        "field": "field_name",
-                                        ]
+                                                        "message": "value is not valid",
-                                    },
+                                                        "type": "value_error",
-                                    "status": ResponseStatus.FAIL.value,
+                                                    }
-                                    "message": "Validation Error",
+                                                ]
-                                    "description": "1 validation error(s) detected",
+                                            },
-                                    "error_code": "VAL-422",
+                                            "status": ResponseStatus.FAIL.value,
+                                            "message": "Validation Error",
+                                            "description": "1 validation error(s) detected",
+                                            "error_code": "VAL-422",
+                                        },
+                                    }
                                 }
                             }
                         },

src/fastapi_toolsets/fixtures/registry.py

@@ -2,6 +2,7 @@
 
 from collections.abc import Callable, Sequence
 from dataclasses import dataclass, field
+from enum import Enum
 from typing import Any, cast
 
 from sqlalchemy.orm import DeclarativeBase
@@ -12,6 +13,13 @@ from .enum import Context
 logger = get_logger()
 
 
+def _normalize_contexts(
+    contexts: list[str | Enum] | tuple[str | Enum, ...],
+) -> list[str]:
+    """Convert a sequence of any Enum subclass and/or plain strings to a list of strings."""
+    return [c.value if isinstance(c, Enum) else c for c in contexts]
+
+
 @dataclass
 class Fixture:
     """A fixture definition with metadata."""
@@ -50,26 +58,51 @@ class FixtureRegistry:
                 Post(id=1, title="Test", user_id=1),
             ]
         ```
+
+    Fixtures with the same name may be registered for **different** contexts.
+    When multiple contexts are loaded together, their instances are merged:
+
+        ```python
+        @fixtures.register(contexts=[Context.BASE])
+        def users():
+            return [User(id=1, username="admin")]
+
+        @fixtures.register(contexts=[Context.TESTING])
+        def users():
+            return [User(id=2, username="tester")]
+        # load_fixtures_by_context(..., Context.BASE, Context.TESTING)
+        # → loads both User(admin) and User(tester) under the "users" name
+        ```
     """
 
     def __init__(
         self,
-        contexts: list[str | Context] | None = None,
+        contexts: list[str | Enum] | None = None,
     ) -> None:
-        self._fixtures: dict[str, Fixture] = {}
+        self._fixtures: dict[str, list[Fixture]] = {}
         self._default_contexts: list[str] | None = (
-            [c.value if isinstance(c, Context) else c for c in contexts]
+            _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(
         self,
         func: Callable[[], Sequence[DeclarativeBase]] | None = None,
         *,
         name: str | None = None,
         depends_on: list[str] | None = None,
-        contexts: list[str | Context] | None = None,
+        contexts: list[str | Enum] | None = None,
     ) -> Callable[..., Any]:
         """Register a fixture function.
 
@@ -79,7 +112,8 @@ class FixtureRegistry:
             func: Fixture function returning list of model instances
             name: Fixture name (defaults to function name)
             depends_on: List of fixture names this depends on
-            contexts: List of contexts this fixture belongs to
+            contexts: List of contexts this fixture belongs to.  Both
+                :class:`Context` enum values and plain strings are accepted.
 
         Example:
             ```python
@@ -90,7 +124,6 @@ class FixtureRegistry:
             @fixtures.register(depends_on=["roles"], contexts=[Context.TESTING])
             def test_users():
                 return [User(id=1, username="test", role_id=1)]
-            ```
         """
 
         def decorator(
@@ -98,19 +131,20 @@ class FixtureRegistry:
         ) -> Callable[[], Sequence[DeclarativeBase]]:
             fixture_name = name or cast(Any, fn).__name__
             if contexts is not None:
-                fixture_contexts = [
+                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)
-                name=fixture_name,
+            self._fixtures.setdefault(fixture_name, []).append(
-                func=fn,
+                Fixture(
-                depends_on=depends_on or [],
+                    name=fixture_name,
-                contexts=fixture_contexts,
+                    func=fn,
+                    depends_on=depends_on or [],
+                    contexts=fixture_contexts,
+                )
             )
             return fn
 
@@ -121,11 +155,14 @@ class FixtureRegistry:
     def include_registry(self, registry: "FixtureRegistry") -> None:
         """Include another `FixtureRegistry` in the same current `FixtureRegistry`.
 
+        Fixtures with the same name are allowed as long as their context sets
+        do not overlap.  Conflicting contexts raise :class:`ValueError`.
+
         Args:
             registry: The `FixtureRegistry` to include
 
         Raises:
-            ValueError: If a fixture name already exists in the current registry
+            ValueError: If a fixture name already exists with overlapping contexts
 
         Example:
             ```python
@@ -139,31 +176,73 @@ class FixtureRegistry:
             registry.include_registry(registry=dev_registry)
             ```
         """
-        for name, fixture in registry._fixtures.items():
+        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

@@ -1,24 +1,219 @@
 """Fixture loading utilities for database seeding."""
 
 from collections.abc import Callable, Sequence
-from typing import Any, TypeVar
+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
 
 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()
 
-T = TypeVar("T", bound=DeclarativeBase)
+
+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 _normalize_rows(dicts: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    """Ensure all row dicts share the same key set."""
+    all_keys: set[str] = set().union(*dicts)
+    return [{k: d.get(k) for k in all_keys} for d in dicts]
+
+
+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 = _normalize_rows([_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 = _normalize_rows([_instance_to_dict(i) for i in instances])
+    stmt = pg_insert(model_cls).values(dicts)
+
+    inserted_keys = set(dicts[0]) if dicts else set()
+    update_cols = [col for col in non_pk_cols if col in inserted_keys]
+
+    if update_cols:
+        stmt = stmt.on_conflict_do_update(
+            index_elements=pk_names,
+            set_={col: stmt.excluded[col] for col in update_cols},
+        )
+    else:
+        stmt = stmt.on_conflict_do_nothing(index_elements=pk_names)
+
+    await session.execute(stmt)
+
+
+async def _batch_skip_existing(
+    session: AsyncSession,
+    model_cls: type[DeclarativeBase],
+    instances: list[DeclarativeBase],
+) -> list[DeclarativeBase]:
+    """INSERT only rows that do not already exist; return the inserted ones."""
+    mapper = model_cls.__mapper__
+    pk_names = [col.name for col in mapper.primary_key]
+
+    no_pk: list[DeclarativeBase] = []
+    with_pk_pairs: list[tuple[DeclarativeBase, Any]] = []
+    for inst in instances:
+        pk = _get_primary_key(inst)
+        if pk is None:
+            no_pk.append(inst)
+        else:
+            with_pk_pairs.append((inst, pk))
+
+    loaded: list[DeclarativeBase] = list(no_pk)
+    if no_pk:
+        await session.execute(
+            pg_insert(model_cls).values(
+                _normalize_rows([_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(_normalize_rows([_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 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:
+        variants = (
+            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] = []
+            continue
+
+        model_name = type(instances[0]).__name__
+        loaded: list[DeclarativeBase] = []
+
+        async with get_transaction(session):
+            for model_cls, group in _group_by_type(instances):
+                match strategy:
+                    case LoadStrategy.INSERT:
+                        await _batch_insert(session, model_cls, group)
+                        loaded.extend(group)
+                    case LoadStrategy.MERGE:
+                        await _batch_merge(session, model_cls, group)
+                        loaded.extend(group)
+                    case LoadStrategy.SKIP_EXISTING:
+                        inserted = await _batch_skip_existing(session, model_cls, group)
+                        loaded.extend(inserted)
+
+        results[name] = loaded
+        logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
+
+    return results
+
+
+def _get_primary_key(instance: DeclarativeBase) -> Any | None:
+    """Get the primary key value of a model instance."""
+    mapper = instance.__class__.__mapper__
+    pk_cols = mapper.primary_key
+
+    if len(pk_cols) == 1:
+        return getattr(instance, pk_cols[0].name, None)
+
+    pk_values = tuple(getattr(instance, col.name, None) for col in pk_cols)
+    if all(v is not None for v in pk_values):
+        return pk_values
+    return None
 
 
 def get_obj_by_attr(
-    fixtures: Callable[[], Sequence[T]], attr_name: str, value: Any
+    fixtures: Callable[[], Sequence[ModelType]], attr_name: str, value: Any
-) -> T:
+) -> ModelType:
     """Get a SQLAlchemy model instance by matching an attribute value.
 
     Args:
@@ -49,6 +244,8 @@ 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
@@ -57,13 +254,6 @@ async def load_fixtures(
 
     Returns:
         Dict mapping fixture names to loaded instances
-
-    Example:
-        ```python
-        # Loads 'roles' first (dependency), then 'users'
-        result = await load_fixtures(session, fixtures, "users")
-        print(result["users"])  # [User(...), ...]
-        ```
     """
     ordered = registry.resolve_dependencies(*names)
     return await _load_ordered(session, registry, ordered, strategy)
@@ -72,89 +262,27 @@ 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
-
-    Example:
-        ```python
-        # Load base + testing fixtures
-        await load_fixtures_by_context(
-            session, fixtures,
-            Context.BASE, Context.TESTING
-        )
-        ```
     """
+    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
-
+    )
-async def _load_ordered(
-    session: AsyncSession,
-    registry: FixtureRegistry,
-    ordered_names: list[str],
-    strategy: LoadStrategy,
-) -> dict[str, list[DeclarativeBase]]:
-    """Load fixtures in order."""
-    results: dict[str, list[DeclarativeBase]] = {}
-
-    for name in ordered_names:
-        fixture = registry.get(name)
-        instances = list(fixture.func())
-
-        if not instances:
-            results[name] = []
-            continue
-
-        model_name = type(instances[0]).__name__
-        loaded: list[DeclarativeBase] = []
-
-        async with get_transaction(session):
-            for instance in instances:
-                if strategy == LoadStrategy.INSERT:
-                    session.add(instance)
-                    loaded.append(instance)
-
-                elif strategy == LoadStrategy.MERGE:
-                    merged = await session.merge(instance)
-                    loaded.append(merged)
-
-                elif strategy == LoadStrategy.SKIP_EXISTING:
-                    pk = _get_primary_key(instance)
-                    if pk is not None:
-                        existing = await session.get(type(instance), pk)
-                        if existing is None:
-                            session.add(instance)
-                            loaded.append(instance)
-                    else:
-                        session.add(instance)
-                        loaded.append(instance)
-
-        results[name] = loaded
-        logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
-
-    return results
-
-
-def _get_primary_key(instance: DeclarativeBase) -> Any | None:
-    """Get the primary key value of a model instance."""
-    mapper = instance.__class__.__mapper__
-    pk_cols = mapper.primary_key
-
-    if len(pk_cols) == 1:
-        return getattr(instance, pk_cols[0].name, None)
-
-    pk_values = tuple(getattr(instance, col.name, None) for col in pk_cols)
-    if all(v is not None for v in pk_values):
-        return pk_values
-    return None

src/fastapi_toolsets/logger.py

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

src/fastapi_toolsets/metrics/handler.py

@@ -51,19 +51,25 @@ def init_metrics(
     """
     for provider in registry.get_providers():
         logger.debug("Initialising metric provider '%s'", provider.name)
-        provider.func()
+        registry._instances[provider.name] = provider.func()
 
-    collectors = registry.get_collectors()
+    # Partition collectors and cache env check at startup — both are stable for the app lifetime.
+    async_collectors = [
+        c for c in registry.get_collectors() if asyncio.iscoroutinefunction(c.func)
+    ]
+    sync_collectors = [
+        c for c in registry.get_collectors() if not asyncio.iscoroutinefunction(c.func)
+    ]
+    multiprocess_mode = _is_multiprocess()
 
     @app.get(path, include_in_schema=False)
     async def metrics_endpoint() -> Response:
-        for collector in collectors:
+        for collector in sync_collectors:
-            if asyncio.iscoroutinefunction(collector.func):
+            collector.func()
-                await collector.func()
+        for collector in async_collectors:
-            else:
+            await collector.func()
-                collector.func()
 
-        if _is_multiprocess():
+        if multiprocess_mode:
             prom_registry = CollectorRegistry()
             multiprocess.MultiProcessCollector(prom_registry)
             output = generate_latest(prom_registry)

src/fastapi_toolsets/metrics/registry.py

@@ -19,31 +19,11 @@ class Metric:
 
 
 class MetricsRegistry:
-    """Registry for managing Prometheus metric providers and collectors.
+    """Registry for managing Prometheus metric providers and collectors."""
-
-    Example:
-        ```python
-        from prometheus_client import Counter, Gauge
-        from fastapi_toolsets.metrics import MetricsRegistry
-
-        metrics = MetricsRegistry()
-
-        @metrics.register
-        def http_requests():
-            return Counter("http_requests_total", "Total HTTP requests", ["method", "status"])
-
-        @metrics.register(name="db_pool")
-        def database_pool_size():
-            return Gauge("db_pool_size", "Database connection pool size")
-
-        @metrics.register(collect=True)
-        def collect_queue_depth(gauge=Gauge("queue_depth", "Current queue depth")):
-            gauge.set(get_current_queue_depth())
-        ```
-    """
 
     def __init__(self) -> None:
         self._metrics: dict[str, Metric] = {}
+        self._instances: dict[str, Any] = {}
 
     def register(
         self,
@@ -61,17 +41,6 @@ class MetricsRegistry:
             name: Metric name (defaults to function name).
             collect: If ``True``, the function is called on every scrape.
                 If ``False`` (default), called once at init time.
-
-        Example:
-            ```python
-            @metrics.register
-            def my_counter():
-                return Counter("my_counter", "A counter")
-
-            @metrics.register(collect=True, name="queue")
-            def collect_queue_depth():
-                gauge.set(compute_depth())
-            ```
         """
 
         def decorator(fn: Callable[..., Any]) -> Callable[..., Any]:
@@ -87,6 +56,25 @@ class MetricsRegistry:
             return decorator(func)
         return decorator
 
+    def get(self, name: str) -> Any:
+        """Return the metric instance created by a provider.
+
+        Args:
+            name: The metric name (defaults to the provider function name).
+
+        Raises:
+            KeyError: If the metric name is unknown or ``init_metrics`` has not
+                been called yet.
+        """
+        if name not in self._instances:
+            if name in self._metrics:
+                raise KeyError(
+                    f"Metric '{name}' exists but has not been initialized yet. "
+                    "Ensure init_metrics() has been called before accessing metric instances."
+                )
+            raise KeyError(f"Unknown metric '{name}'.")
+        return self._instances[name]
+
     def include_registry(self, registry: "MetricsRegistry") -> None:
         """Include another :class:`MetricsRegistry` into this one.
 
@@ -95,18 +83,6 @@ class MetricsRegistry:
 
         Raises:
             ValueError: If a metric name already exists in the current registry.
-
-        Example:
-            ```python
-            main = MetricsRegistry()
-            sub = MetricsRegistry()
-
-            @sub.register
-            def sub_metric():
-                return Counter("sub_total", "Sub counter")
-
-            main.include_registry(sub)
-            ```
         """
         for metric_name, definition in registry._metrics.items():
             if metric_name in self._metrics:

src/fastapi_toolsets/models/__init__.py

@@ -0,0 +1,21 @@
+"""SQLAlchemy model mixins for common column patterns."""
+
+from .columns import (
+    CreatedAtMixin,
+    TimestampMixin,
+    UUIDMixin,
+    UUIDv7Mixin,
+    UpdatedAtMixin,
+)
+from .watched import ModelEvent, WatchedFieldsMixin, watch
+
+__all__ = [
+    "ModelEvent",
+    "UUIDMixin",
+    "UUIDv7Mixin",
+    "CreatedAtMixin",
+    "UpdatedAtMixin",
+    "TimestampMixin",
+    "WatchedFieldsMixin",
+    "watch",
+]

src/fastapi_toolsets/models/columns.py

@@ -0,0 +1,58 @@
+"""SQLAlchemy column mixins for common column patterns."""
+
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, Uuid, text
+from sqlalchemy.orm import Mapped, mapped_column
+
+__all__ = [
+    "UUIDMixin",
+    "UUIDv7Mixin",
+    "CreatedAtMixin",
+    "UpdatedAtMixin",
+    "TimestampMixin",
+]
+
+
+class UUIDMixin:
+    """Mixin that adds a UUID primary key auto-generated by the database."""
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        Uuid,
+        primary_key=True,
+        server_default=text("gen_random_uuid()"),
+    )
+
+
+class UUIDv7Mixin:
+    """Mixin that adds a UUIDv7 primary key auto-generated by the database."""
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        Uuid,
+        primary_key=True,
+        server_default=text("uuidv7()"),
+    )
+
+
+class CreatedAtMixin:
+    """Mixin that adds a ``created_at`` timestamp column."""
+
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=text("clock_timestamp()"),
+    )
+
+
+class UpdatedAtMixin:
+    """Mixin that adds an ``updated_at`` timestamp column."""
+
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=text("clock_timestamp()"),
+        onupdate=text("clock_timestamp()"),
+    )
+
+
+class TimestampMixin(CreatedAtMixin, UpdatedAtMixin):
+    """Mixin that combines ``created_at`` and ``updated_at`` timestamp columns."""

src/fastapi_toolsets/models/watched.py

@@ -0,0 +1,281 @@
+"""Field-change monitoring via SQLAlchemy session events."""
+
+import asyncio
+import inspect
+import weakref
+from collections.abc import Awaitable
+from enum import Enum
+from typing import Any, TypeVar
+
+from sqlalchemy import event
+from sqlalchemy import inspect as sa_inspect
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm.attributes import set_committed_value as _sa_set_committed_value
+
+from ..logger import get_logger
+
+__all__ = ["ModelEvent", "WatchedFieldsMixin", "watch"]
+
+_logger = get_logger()
+_T = TypeVar("_T")
+_CALLBACK_ERROR_MSG = "WatchedFieldsMixin callback raised an unhandled exception"
+_WATCHED_FIELDS: weakref.WeakKeyDictionary[type, list[str]] = (
+    weakref.WeakKeyDictionary()
+)
+_SESSION_PENDING_NEW = "_ft_pending_new"
+_SESSION_CREATES = "_ft_creates"
+_SESSION_DELETES = "_ft_deletes"
+_SESSION_UPDATES = "_ft_updates"
+_SESSION_SAVEPOINT_DEPTH = "_ft_sp_depth"
+_DEFERRED_STRATEGY_KEY = (("deferred", True), ("instrument", True))
+
+
+class ModelEvent(str, Enum):
+    """Event types emitted by :class:`WatchedFieldsMixin`."""
+
+    CREATE = "create"
+    DELETE = "delete"
+    UPDATE = "update"
+
+
+def watch(*fields: str) -> Any:
+    """Class decorator to filter which fields trigger ``on_update``.
+
+    Args:
+        *fields: One or more field names to watch. At least one name is required.
+
+    Raises:
+        ValueError: If called with no field names.
+    """
+    if not fields:
+        raise ValueError("@watch requires at least one field name.")
+
+    def decorator(cls: type[_T]) -> type[_T]:
+        _WATCHED_FIELDS[cls] = list(fields)
+        return cls
+
+    return decorator
+
+
+def _snapshot_column_attrs(obj: Any) -> dict[str, Any]:
+    """Read currently-loaded column values into a plain dict."""
+    state = sa_inspect(obj)  # InstanceState
+    state_dict = state.dict
+    snapshot: dict[str, Any] = {}
+    for prop in state.mapper.column_attrs:
+        if prop.key in state_dict:
+            snapshot[prop.key] = state_dict[prop.key]
+        elif (
+            not state.expired
+            and prop.strategy_key != _DEFERRED_STRATEGY_KEY
+            and all(
+                col.nullable
+                and col.server_default is None
+                and col.server_onupdate is None
+                for col in prop.columns
+            )
+        ):
+            snapshot[prop.key] = None
+    return snapshot
+
+
+def _get_watched_fields(cls: type) -> list[str] | None:
+    """Return the watched fields for *cls*, walking the MRO to inherit from parents."""
+    for klass in cls.__mro__:
+        if klass in _WATCHED_FIELDS:
+            return _WATCHED_FIELDS[klass]
+    return None
+
+
+def _upsert_changes(
+    pending: dict[int, tuple[Any, dict[str, dict[str, Any]]]],
+    obj: Any,
+    changes: dict[str, dict[str, Any]],
+) -> None:
+    """Insert or merge *changes* into *pending* for *obj*."""
+    key = id(obj)
+    if key in pending:
+        existing = pending[key][1]
+        for field, change in changes.items():
+            if field in existing:
+                existing[field]["new"] = change["new"]
+            else:
+                existing[field] = change
+    else:
+        pending[key] = (obj, changes)
+
+
+@event.listens_for(AsyncSession.sync_session_class, "after_transaction_create")
+def _after_transaction_create(session: Any, transaction: Any) -> None:
+    if transaction.nested:
+        session.info[_SESSION_SAVEPOINT_DEPTH] = (
+            session.info.get(_SESSION_SAVEPOINT_DEPTH, 0) + 1
+        )
+
+
+@event.listens_for(AsyncSession.sync_session_class, "after_transaction_end")
+def _after_transaction_end(session: Any, transaction: Any) -> None:
+    if transaction.nested:
+        depth = session.info.get(_SESSION_SAVEPOINT_DEPTH, 0)
+        if depth > 0:  # pragma: no branch
+            session.info[_SESSION_SAVEPOINT_DEPTH] = depth - 1
+
+
+@event.listens_for(AsyncSession.sync_session_class, "after_flush")
+def _after_flush(session: Any, flush_context: Any) -> None:
+    # New objects: capture references while session.new is still populated.
+    # Values are read in _after_flush_postexec once RETURNING has been processed.
+    for obj in session.new:
+        if isinstance(obj, WatchedFieldsMixin):
+            session.info.setdefault(_SESSION_PENDING_NEW, []).append(obj)
+
+    # Deleted objects: capture before they leave the identity map.
+    for obj in session.deleted:
+        if isinstance(obj, WatchedFieldsMixin):
+            session.info.setdefault(_SESSION_DELETES, []).append(obj)
+
+    # Dirty objects: read old/new from SQLAlchemy attribute history.
+    for obj in session.dirty:
+        if not isinstance(obj, WatchedFieldsMixin):
+            continue
+
+        # None = not in dict = watch all fields; list = specific fields only
+        watched = _get_watched_fields(type(obj))
+        changes: dict[str, dict[str, Any]] = {}
+
+        attrs = (
+            # Specific fields
+            ((field, sa_inspect(obj).attrs[field]) for field in watched)
+            if watched is not None
+            # All mapped fields
+            else ((s.key, s) for s in sa_inspect(obj).attrs)
+        )
+        for field, attr_state in attrs:
+            history = attr_state.history
+            if history.has_changes() and history.deleted:
+                changes[field] = {
+                    "old": history.deleted[0],
+                    "new": history.added[0] if history.added else None,
+                }
+
+        if changes:
+            _upsert_changes(
+                session.info.setdefault(_SESSION_UPDATES, {}),
+                obj,
+                changes,
+            )
+
+
+@event.listens_for(AsyncSession.sync_session_class, "after_flush_postexec")
+def _after_flush_postexec(session: Any, flush_context: Any) -> None:
+    # New objects are now persistent and RETURNING values have been applied,
+    # so server defaults (id, created_at, …) are available via getattr.
+    pending_new: list[Any] = session.info.pop(_SESSION_PENDING_NEW, [])
+    if not pending_new:
+        return
+    session.info.setdefault(_SESSION_CREATES, []).extend(pending_new)
+
+
+@event.listens_for(AsyncSession.sync_session_class, "after_rollback")
+def _after_rollback(session: Any) -> None:
+    session.info.pop(_SESSION_PENDING_NEW, None)
+    session.info.pop(_SESSION_CREATES, None)
+    session.info.pop(_SESSION_DELETES, None)
+    session.info.pop(_SESSION_UPDATES, None)
+
+
+def _task_error_handler(task: asyncio.Task[Any]) -> None:
+    if not task.cancelled() and (exc := task.exception()):
+        _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
+
+
+def _schedule_with_snapshot(
+    loop: asyncio.AbstractEventLoop, obj: Any, fn: Any, *args: Any
+) -> None:
+    """Snapshot *obj*'s column attrs now (before expire_on_commit wipes them),
+    then schedule a coroutine that restores the snapshot and calls *fn*.
+    """
+    snapshot = _snapshot_column_attrs(obj)
+
+    async def _run(
+        obj: Any = obj,
+        fn: Any = fn,
+        snapshot: dict[str, Any] = snapshot,
+        args: tuple = args,
+    ) -> None:
+        for key, value in snapshot.items():
+            _sa_set_committed_value(obj, key, value)
+        try:
+            result = fn(*args)
+            if inspect.isawaitable(result):
+                await result
+        except Exception as exc:
+            _logger.error(_CALLBACK_ERROR_MSG, exc_info=exc)
+
+    task = loop.create_task(_run())
+    task.add_done_callback(_task_error_handler)
+
+
+@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
+
+    try:
+        loop = asyncio.get_running_loop()
+    except RuntimeError:
+        return
+
+    for obj in creates:
+        _schedule_with_snapshot(loop, obj, obj.on_create)
+
+    for obj in deletes:
+        _schedule_with_snapshot(loop, obj, obj.on_delete)
+
+    for obj, changes in field_changes.values():
+        _schedule_with_snapshot(loop, obj, obj.on_update, changes)
+
+
+class WatchedFieldsMixin:
+    """Mixin that enables lifecycle callbacks for SQLAlchemy models."""
+
+    def on_event(
+        self, event: ModelEvent, changes: dict[str, dict[str, Any]] | None = None
+    ) -> Awaitable[None] | None:
+        """Catch-all callback fired for every lifecycle event.
+
+        Args:
+            event: The event type (:attr:`ModelEvent.CREATE`, :attr:`ModelEvent.DELETE`,
+                or :attr:`ModelEvent.UPDATE`).
+            changes: Field changes for :attr:`ModelEvent.UPDATE`, ``None`` otherwise.
+        """
+
+    def on_create(self) -> Awaitable[None] | None:
+        """Called after INSERT commit."""
+        return self.on_event(ModelEvent.CREATE)
+
+    def on_delete(self) -> Awaitable[None] | None:
+        """Called after DELETE commit."""
+        return self.on_event(ModelEvent.DELETE)
+
+    def on_update(self, changes: dict[str, dict[str, Any]]) -> Awaitable[None] | None:
+        """Called after UPDATE commit when watched fields change."""
+        return self.on_event(ModelEvent.UPDATE, changes=changes)

src/fastapi_toolsets/pytest/utils.py

@@ -1,6 +1,7 @@
 """Pytest helper utilities for FastAPI testing."""
 
 import os
+import warnings
 from collections.abc import AsyncGenerator, Callable
 from contextlib import asynccontextmanager
 from typing import Any
@@ -15,7 +16,130 @@ from sqlalchemy.ext.asyncio import (
 )
 from sqlalchemy.orm import DeclarativeBase
 
-from ..db import create_db_context
+from ..db import cleanup_tables as _cleanup_tables
+from ..db import create_database
+
+
+async def cleanup_tables(
+    session: AsyncSession,
+    base: type[DeclarativeBase],
+) -> None:
+    """Truncate all tables for fast between-test cleanup.
+
+    .. deprecated::
+        Import ``cleanup_tables`` from ``fastapi_toolsets.db`` instead.
+        This re-export will be removed in v3.0.0.
+    """
+    warnings.warn(
+        "Importing cleanup_tables from fastapi_toolsets.pytest is deprecated "
+        "and will be removed in v3.0.0. "
+        "Use 'from fastapi_toolsets.db import cleanup_tables' instead.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
+    await _cleanup_tables(session=session, base=base)
+
+
+def _get_xdist_worker(default_test_db: str) -> str:
+    """Return the pytest-xdist worker name, or *default_test_db* when not running under xdist.
+
+    Reads the ``PYTEST_XDIST_WORKER`` environment variable that xdist sets
+    automatically in each worker process (e.g. ``"gw0"``, ``"gw1"``).
+    When xdist is not installed or not active, the variable is absent and
+    *default_test_db* is returned instead.
+
+    Args:
+        default_test_db: Fallback value returned when ``PYTEST_XDIST_WORKER``
+            is not set.
+    """
+    return os.environ.get("PYTEST_XDIST_WORKER", default_test_db)
+
+
+def worker_database_url(database_url: str, default_test_db: str) -> str:
+    """Derive a per-worker database URL for pytest-xdist parallel runs.
+
+    Appends ``_{worker_name}`` to the database name so each xdist worker
+    operates on its own database.  When not running under xdist,
+    ``_{default_test_db}`` is appended instead.
+
+    The worker name is read from the ``PYTEST_XDIST_WORKER`` environment
+    variable (set automatically by xdist in each worker process).
+
+    Args:
+        database_url: Original database connection URL.
+        default_test_db: Suffix appended to the database name when
+            ``PYTEST_XDIST_WORKER`` is not set.
+
+    Returns:
+        A database URL with a worker- or default-specific database name.
+    """
+    worker = _get_xdist_worker(default_test_db=default_test_db)
+
+    url = make_url(database_url)
+    url = url.set(database=f"{url.database}_{worker}")
+    return url.render_as_string(hide_password=False)
+
+
+@asynccontextmanager
+async def create_worker_database(
+    database_url: str,
+    default_test_db: str = "test_db",
+) -> AsyncGenerator[str, None]:
+    """Create and drop a per-worker database for pytest-xdist isolation.
+
+    Derives a worker-specific database URL using :func:`worker_database_url`,
+    then delegates to :func:`~fastapi_toolsets.db.create_database` to create
+    and drop it.  Intended for use as a **session-scoped** fixture.
+
+    When running under xdist the database name is suffixed with the worker
+    name (e.g. ``_gw0``).  Otherwise it is suffixed with *default_test_db*.
+
+    Args:
+        database_url: Original database connection URL (used as the server
+            connection and as the base for the worker database name).
+        default_test_db: Suffix appended to the database name when
+            ``PYTEST_XDIST_WORKER`` is not set. Defaults to ``"test_db"``.
+
+    Yields:
+        The worker-specific database URL.
+
+    Example:
+        ```python
+        from fastapi_toolsets.pytest import create_worker_database, create_db_session
+
+        DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost/test_db"
+
+        @pytest.fixture(scope="session")
+        async def worker_db_url():
+            async with create_worker_database(DATABASE_URL) as url:
+                yield url
+
+        @pytest.fixture
+        async def db_session(worker_db_url):
+            async with create_db_session(
+                worker_db_url, Base, cleanup=True
+            ) as session:
+                yield session
+        ```
+    """
+    worker_url = worker_database_url(
+        database_url=database_url, default_test_db=default_test_db
+    )
+    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:
+        async with engine.connect() as conn:
+            await conn.execute(text(f"DROP DATABASE IF EXISTS {worker_db_name}"))
+        await create_database(db_name=worker_db_name, server_url=database_url)
+
+        yield worker_url
+
+        async with engine.connect() as conn:
+            await conn.execute(text(f"DROP DATABASE IF EXISTS {worker_db_name}"))
+    finally:
+        await engine.dispose()
 
 
 @asynccontextmanager
@@ -141,175 +265,15 @@ 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:
                 await conn.run_sync(base.metadata.drop_all)
     finally:
         await engine.dispose()
-
-
-def _get_xdist_worker(default_test_db: str) -> str:
-    """Return the pytest-xdist worker name, or *default_test_db* when not running under xdist.
-
-    Reads the ``PYTEST_XDIST_WORKER`` environment variable that xdist sets
-    automatically in each worker process (e.g. ``"gw0"``, ``"gw1"``).
-    When xdist is not installed or not active, the variable is absent and
-    *default_test_db* is returned instead.
-
-    Args:
-        default_test_db: Fallback value returned when ``PYTEST_XDIST_WORKER``
-            is not set.
-    """
-    return os.environ.get("PYTEST_XDIST_WORKER", default_test_db)
-
-
-def worker_database_url(database_url: str, default_test_db: str) -> str:
-    """Derive a per-worker database URL for pytest-xdist parallel runs.
-
-    Appends ``_{worker_name}`` to the database name so each xdist worker
-    operates on its own database.  When not running under xdist,
-    ``_{default_test_db}`` is appended instead.
-
-    The worker name is read from the ``PYTEST_XDIST_WORKER`` environment
-    variable (set automatically by xdist in each worker process).
-
-    Args:
-        database_url: Original database connection URL.
-        default_test_db: Suffix appended to the database name when
-            ``PYTEST_XDIST_WORKER`` is not set.
-
-    Returns:
-        A database URL with a worker- or default-specific database name.
-
-    Example:
-        ```python
-        # With PYTEST_XDIST_WORKER="gw0":
-        url = worker_database_url(
-            "postgresql+asyncpg://user:pass@localhost/test_db",
-            default_test_db="test",
-        )
-        # "postgresql+asyncpg://user:pass@localhost/test_db_gw0"
-
-        # Without PYTEST_XDIST_WORKER:
-        url = worker_database_url(
-            "postgresql+asyncpg://user:pass@localhost/test_db",
-            default_test_db="test",
-        )
-        # "postgresql+asyncpg://user:pass@localhost/test_db_test"
-        ```
-    """
-    worker = _get_xdist_worker(default_test_db=default_test_db)
-
-    url = make_url(database_url)
-    url = url.set(database=f"{url.database}_{worker}")
-    return url.render_as_string(hide_password=False)
-
-
-@asynccontextmanager
-async def create_worker_database(
-    database_url: str,
-    default_test_db: str = "test_db",
-) -> AsyncGenerator[str, None]:
-    """Create and drop a per-worker database for pytest-xdist isolation.
-
-    Intended for use as a **session-scoped** fixture.  Connects to the server
-    using the original *database_url* (with ``AUTOCOMMIT`` isolation for DDL),
-    creates a dedicated database for the worker, and yields the worker-specific
-    URL.  On cleanup the worker database is dropped.
-
-    When running under xdist the database name is suffixed with the worker
-    name (e.g. ``_gw0``).  Otherwise it is suffixed with *default_test_db*.
-
-    Args:
-        database_url: Original database connection URL.
-        default_test_db: Suffix appended to the database name when
-            ``PYTEST_XDIST_WORKER`` is not set. Defaults to ``"test_db"``.
-
-    Yields:
-        The worker-specific database URL.
-
-    Example:
-        ```python
-        from fastapi_toolsets.pytest import (
-            create_worker_database, create_db_session,
-        )
-
-        DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost/test_db"
-
-        @pytest.fixture(scope="session")
-        async def worker_db_url():
-            async with create_worker_database(DATABASE_URL) as url:
-                yield url
-
-        @pytest.fixture
-        async def db_session(worker_db_url):
-            async with create_db_session(
-                worker_db_url, Base, cleanup=True
-            ) as session:
-                yield session
-        ```
-    """
-    worker_url = worker_database_url(
-        database_url=database_url, default_test_db=default_test_db
-    )
-    worker_db_name = make_url(worker_url).database
-
-    engine = create_async_engine(
-        database_url,
-        isolation_level="AUTOCOMMIT",
-    )
-    try:
-        async with engine.connect() as conn:
-            await conn.execute(text(f"DROP DATABASE IF EXISTS {worker_db_name}"))
-            await conn.execute(text(f"CREATE DATABASE {worker_db_name}"))
-
-        yield worker_url
-
-        async with engine.connect() as conn:
-            await conn.execute(text(f"DROP DATABASE IF EXISTS {worker_db_name}"))
-    finally:
-        await engine.dispose()
-
-
-async def cleanup_tables(
-    session: AsyncSession,
-    base: type[DeclarativeBase],
-) -> None:
-    """Truncate all tables for fast between-test cleanup.
-
-    Executes a single ``TRUNCATE … RESTART IDENTITY CASCADE`` statement
-    across every table in *base*'s metadata, which is significantly faster
-    than dropping and re-creating tables between tests.
-
-    This is a no-op when the metadata contains no tables.
-
-    Args:
-        session: An active async database session.
-        base: SQLAlchemy DeclarativeBase class containing model metadata.
-
-    Example:
-        ```python
-        @pytest.fixture
-        async def db_session(worker_db_url):
-            async with create_db_session(worker_db_url, Base) as session:
-                yield session
-                await cleanup_tables(session, Base)
-        ```
-    """
-    tables = base.metadata.sorted_tables
-    if not tables:
-        return
-
-    table_names = ", ".join(f'"{t.name}"' for t in tables)
-    await session.execute(text(f"TRUNCATE {table_names} RESTART IDENTITY CASCADE"))
-    await session.commit()

src/fastapi_toolsets/schemas.py

@@ -1,24 +1,27 @@
 """Base Pydantic schemas for API responses."""
 
+import math
 from enum import Enum
-from typing import Any, ClassVar, Generic, TypeVar
+from typing import Annotated, Any, ClassVar, Generic, Literal, TypeVar, Union
 
-from pydantic import BaseModel, ConfigDict
+from pydantic import BaseModel, ConfigDict, Field, computed_field
+
+from .types import DataT
 
 __all__ = [
     "ApiError",
     "CursorPagination",
+    "CursorPaginatedResponse",
     "ErrorResponse",
     "OffsetPagination",
-    "Pagination",
+    "OffsetPaginatedResponse",
     "PaginatedResponse",
+    "PaginationType",
     "PydanticBase",
     "Response",
     "ResponseStatus",
 ]
 
-DataT = TypeVar("DataT")
-
 
 class PydanticBase(BaseModel):
     """Base class for all Pydantic models with common configuration."""
@@ -96,20 +99,28 @@ 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
-# Backward-compatible - will be removed in v2.0
+    @property
-Pagination = OffsetPagination
+    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):
@@ -128,9 +139,66 @@ class CursorPagination(PydanticBase):
     has_more: bool
 
 
+class PaginationType(str, Enum):
+    """Pagination strategy selector for :meth:`.AsyncCrud.paginate`."""
+
+    OFFSET = "offset"
+    CURSOR = "cursor"
+
+
 class PaginatedResponse(BaseResponse, Generic[DataT]):
-    """Paginated API response for list endpoints."""
+    """Paginated API response for list endpoints.
+
+    Base class and return type for endpoints that support both pagination
+    strategies.  Use :class:`OffsetPaginatedResponse` or
+    :class:`CursorPaginatedResponse` when the strategy is fixed.
+
+    When used as ``PaginatedResponse[T]`` in a return annotation, subscripting
+    returns ``Annotated[Union[CursorPaginatedResponse[T], OffsetPaginatedResponse[T]], Field(discriminator="pagination_type")]``
+    so FastAPI emits a proper ``oneOf`` + discriminator in the OpenAPI schema.
+    """
 
     data: list[DataT]
     pagination: OffsetPagination | CursorPagination
+    pagination_type: PaginationType | None = None
     filter_attributes: dict[str, list[Any]] | None = None
+
+    _discriminated_union_cache: ClassVar[dict[Any, Any]] = {}
+
+    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]],  # ty:ignore[invalid-type-form]
+                    Field(discriminator="pagination_type"),
+                ]
+                cls._discriminated_union_cache[item] = cached
+            return cached  # ty:ignore[invalid-return-type]
+        return super().__class_getitem__(item)
+
+
+class OffsetPaginatedResponse(PaginatedResponse[DataT]):
+    """Paginated response with typed offset-based pagination metadata.
+
+    The ``pagination_type`` field is always ``"offset"`` and acts as a
+    discriminator, allowing frontend clients to narrow the union type returned
+    by a unified ``paginate()`` endpoint.
+    """
+
+    pagination: OffsetPagination
+    pagination_type: Literal[PaginationType.OFFSET] = PaginationType.OFFSET
+
+
+class CursorPaginatedResponse(PaginatedResponse[DataT]):
+    """Paginated response with typed cursor-based pagination metadata.
+
+    The ``pagination_type`` field is always ``"cursor"`` and acts as a
+    discriminator, allowing frontend clients to narrow the union type returned
+    by a unified ``paginate()`` endpoint.
+    """
+
+    pagination: CursorPagination
+    pagination_type: Literal[PaginationType.CURSOR] = PaginationType.CURSOR

src/fastapi_toolsets/types.py

@@ -0,0 +1,27 @@
+"""Shared type aliases for the fastapi-toolsets package."""
+
+from collections.abc import AsyncGenerator, Callable, Mapping
+from typing import Any, TypeVar
+
+from pydantic import BaseModel
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import DeclarativeBase, QueryableAttribute
+from sqlalchemy.orm.attributes import InstrumentedAttribute
+from sqlalchemy.sql.elements import ColumnElement
+
+# Generic TypeVars
+DataT = TypeVar("DataT")
+ModelType = TypeVar("ModelType", bound=DeclarativeBase)
+SchemaType = TypeVar("SchemaType", bound=BaseModel)
+
+# CRUD type aliases
+JoinType = list[tuple[type[DeclarativeBase], Any]]
+M2MFieldType = Mapping[str, QueryableAttribute[Any]]
+OrderByClause = ColumnElement[Any] | QueryableAttribute[Any]
+
+# Search / facet type aliases
+SearchFieldType = InstrumentedAttribute[Any] | tuple[InstrumentedAttribute[Any], ...]
+FacetFieldType = SearchFieldType
+
+# Dependency type aliases
+SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]] | Any

tests/conftest.py

@@ -57,6 +57,7 @@ class User(Base):
     username: Mapped[str] = mapped_column(String(50), unique=True)
     email: Mapped[str] = mapped_column(String(100), unique=True)
     is_active: Mapped[bool] = mapped_column(default=True)
+    notes: Mapped[str | None]
     role_id: Mapped[uuid.UUID | None] = mapped_column(
         ForeignKey("roles.id"), nullable=True
     )
@@ -92,6 +93,15 @@ class IntRole(Base):
     name: Mapped[str] = mapped_column(String(50), unique=True)
 
 
+class Permission(Base):
+    """Test model with composite primary key."""
+
+    __tablename__ = "permissions"
+
+    subject: Mapped[str] = mapped_column(String(50), primary_key=True)
+    action: Mapped[str] = mapped_column(String(50), primary_key=True)
+
+
 class Event(Base):
     """Test model with DateTime and Date cursor columns."""
 
@@ -162,6 +172,7 @@ class UserRead(PydanticBase):
 
     id: uuid.UUID
     username: str
+    is_active: bool = True
 
 
 class UserUpdate(BaseModel):
@@ -218,12 +229,26 @@ class PostM2MUpdate(BaseModel):
     tag_ids: list[uuid.UUID] | None = None
 
 
+class IntRoleRead(PydanticBase):
+    """Schema for reading an IntRole."""
+
+    id: int
+    name: str
+
+
 class IntRoleCreate(BaseModel):
     """Schema for creating an IntRole."""
 
     name: str
 
 
+class EventRead(PydanticBase):
+    """Schema for reading an Event."""
+
+    id: uuid.UUID
+    name: str
+
+
 class EventCreate(BaseModel):
     """Schema for creating an Event."""
 
@@ -232,6 +257,13 @@ class EventCreate(BaseModel):
     scheduled_date: datetime.date
 
 
+class ProductRead(PydanticBase):
+    """Schema for reading a Product."""
+
+    id: uuid.UUID
+    name: str
+
+
 class ProductCreate(BaseModel):
     """Schema for creating a Product."""
 
@@ -290,30 +322,3 @@ 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_search.py

@@ -14,15 +14,18 @@ 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,
+    UserRead,
 )
 
 
@@ -42,10 +45,11 @@ class TestPaginateSearch:
             db_session, UserCreate(username="bob_smith", email="bob@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="doe",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -61,10 +65,11 @@ class TestPaginateSearch:
             db_session, UserCreate(username="company_bob", email="bob@other.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="company",
             search_fields=[User.username, User.email],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -89,10 +94,11 @@ class TestPaginateSearch:
             UserCreate(username="user1", email="u1@test.com", role_id=user_role.id),
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="admin",
             search_fields=[(User.role, Role.name)],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -108,10 +114,11 @@ class TestPaginateSearch:
         )
 
         # Search "admin" in username OR role.name
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="admin",
             search_fields=[User.username, (User.role, Role.name)],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -124,10 +131,11 @@ class TestPaginateSearch:
             db_session, UserCreate(username="JohnDoe", email="j@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="johndoe",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -141,19 +149,21 @@ class TestPaginateSearch:
         )
 
         # Should not find (case mismatch)
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search=SearchConfig(query="johndoe", case_sensitive=True),
             search_fields=[User.username],
+            schema=UserRead,
         )
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 0
 
         # Should find (case match)
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search=SearchConfig(query="JohnDoe", case_sensitive=True),
             search_fields=[User.username],
+            schema=UserRead,
         )
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
@@ -168,11 +178,13 @@ class TestPaginateSearch:
             db_session, UserCreate(username="user2", email="u2@test.com")
         )
 
-        result = await UserCrud.paginate(db_session, search="")
+        result = await UserCrud.offset_paginate(db_session, search="", schema=UserRead)
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
-        result = await UserCrud.paginate(db_session, search=None)
+        result = await UserCrud.offset_paginate(
+            db_session, search=None, schema=UserRead
+        )
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
@@ -188,11 +200,12 @@ class TestPaginateSearch:
             UserCreate(username="inactive_john", email="ij@test.com", is_active=False),
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             filters=[User.is_active == True],  # noqa: E712
             search="john",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -200,13 +213,18 @@ class TestPaginateSearch:
         assert result.data[0].username == "active_john"
 
     @pytest.mark.anyio
-    async def test_search_auto_detect_fields(self, db_session: AsyncSession):
+    async def test_search_explicit_fields(self, db_session: AsyncSession):
-        """Auto-detect searchable fields when not specified."""
+        """Search works when search_fields are passed per call."""
         await UserCrud.create(
             db_session, UserCreate(username="findme", email="other@test.com")
         )
 
-        result = await UserCrud.paginate(db_session, search="findme")
+        result = await UserCrud.offset_paginate(
+            db_session,
+            search="findme",
+            search_fields=[User.username],
+            schema=UserRead,
+        )
 
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
@@ -218,10 +236,11 @@ class TestPaginateSearch:
             db_session, UserCreate(username="john", email="j@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="nonexistent",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -237,12 +256,13 @@ class TestPaginateSearch:
                 UserCreate(username=f"user_{i}", email=f"user{i}@test.com"),
             )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="user_",
             search_fields=[User.username],
             page=1,
             items_per_page=5,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -264,10 +284,11 @@ class TestPaginateSearch:
         )
 
         # Search in username, not in role
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="role",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -286,11 +307,12 @@ class TestPaginateSearch:
             db_session, UserCreate(username="bob", email="b@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="@test.com",
             search_fields=[User.email],
             order_by=User.username,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -310,10 +332,11 @@ class TestPaginateSearch:
         )
 
         # Search by UUID (partial match)
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="12345678",
             search_fields=[User.id, User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -363,10 +386,11 @@ class TestSearchConfig:
         )
 
         # 'john' must be in username AND email
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search=SearchConfig(query="john", match_mode="all"),
             search_fields=[User.username, User.email],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -380,9 +404,10 @@ class TestSearchConfig:
             db_session, UserCreate(username="test", email="findme@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search=SearchConfig(query="findme", fields=[User.email]),
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -410,7 +435,7 @@ class TestNoSearchableFieldsError:
         from fastapi_toolsets.exceptions import NoSearchableFieldsError
 
         error = NoSearchableFieldsError(User)
-        assert "User" in str(error)
+        assert "User" in error.api_error.desc
         assert error.model is User
 
     def test_error_raised_when_no_fields(self):
@@ -434,7 +459,7 @@ class TestNoSearchableFieldsError:
             build_search_filters(NoStringModel, "test")
 
         assert exc_info.value.model is NoStringModel
-        assert "NoStringModel" in str(exc_info.value)
+        assert "NoStringModel" in exc_info.value.api_error.desc
 
 
 class TestGetSearchableFields:
@@ -478,7 +503,7 @@ class TestFacetsNotSet:
             db_session, UserCreate(username="alice", email="a@test.com")
         )
 
-        result = await UserCrud.offset_paginate(db_session)
+        result = await UserCrud.offset_paginate(db_session, schema=UserRead)
 
         assert result.filter_attributes is None
 
@@ -490,7 +515,7 @@ class TestFacetsNotSet:
             db_session, UserCreate(username="alice", email="a@test.com")
         )
 
-        result = await UserCursorCrud.cursor_paginate(db_session)
+        result = await UserCursorCrud.cursor_paginate(db_session, schema=UserRead)
 
         assert result.filter_attributes is None
 
@@ -509,7 +534,7 @@ class TestFacetsDirectColumn:
             db_session, UserCreate(username="bob", email="b@test.com")
         )
 
-        result = await UserFacetCrud.offset_paginate(db_session)
+        result = await UserFacetCrud.offset_paginate(db_session, schema=UserRead)
 
         assert result.filter_attributes is not None
         # Distinct usernames, sorted
@@ -528,7 +553,7 @@ class TestFacetsDirectColumn:
             db_session, UserCreate(username="bob", email="b@test.com")
         )
 
-        result = await UserFacetCursorCrud.cursor_paginate(db_session)
+        result = await UserFacetCursorCrud.cursor_paginate(db_session, schema=UserRead)
 
         assert result.filter_attributes is not None
         assert set(result.filter_attributes["email"]) == {"a@test.com", "b@test.com"}
@@ -544,7 +569,7 @@ class TestFacetsDirectColumn:
             db_session, UserCreate(username="bob", email="b@test.com")
         )
 
-        result = await UserFacetCrud.offset_paginate(db_session)
+        result = await UserFacetCrud.offset_paginate(db_session, schema=UserRead)
 
         assert result.filter_attributes is not None
         assert "username" in result.filter_attributes
@@ -561,7 +586,7 @@ class TestFacetsDirectColumn:
 
         # Override: ask for email instead of username
         result = await UserFacetCrud.offset_paginate(
-            db_session, facet_fields=[User.email]
+            db_session, facet_fields=[User.email], schema=UserRead
         )
 
         assert result.filter_attributes is not None
@@ -587,6 +612,7 @@ class TestFacetsRespectFilters:
         result = await UserFacetCrud.offset_paginate(
             db_session,
             filters=[User.is_active == True],  # noqa: E712
+            schema=UserRead,
         )
 
         assert result.filter_attributes is not None
@@ -617,10 +643,10 @@ class TestFacetsRelationship:
             db_session, UserCreate(username="charlie", email="c@test.com")
         )
 
-        result = await UserRelFacetCrud.offset_paginate(db_session)
+        result = await UserRelFacetCrud.offset_paginate(db_session, schema=UserRead)
 
         assert result.filter_attributes is not None
-        assert set(result.filter_attributes["name"]) == {"admin", "editor"}
+        assert set(result.filter_attributes["role__name"]) == {"admin", "editor"}
 
     @pytest.mark.anyio
     async def test_relationship_facet_none_excluded(self, db_session: AsyncSession):
@@ -632,10 +658,10 @@ class TestFacetsRelationship:
             db_session, UserCreate(username="norole", email="n@test.com")
         )
 
-        result = await UserRelFacetCrud.offset_paginate(db_session)
+        result = await UserRelFacetCrud.offset_paginate(db_session, schema=UserRead)
 
         assert result.filter_attributes is not None
-        assert result.filter_attributes["name"] == []
+        assert result.filter_attributes["role__name"] == []
 
     @pytest.mark.anyio
     async def test_relationship_facet_deduplicates_join_with_search(
@@ -656,11 +682,14 @@ class TestFacetsRelationship:
         )
 
         result = await UserSearchFacetCrud.offset_paginate(
-            db_session, search="admin", search_fields=[(User.role, Role.name)]
+            db_session,
+            search="admin",
+            search_fields=[(User.role, Role.name)],
+            schema=UserRead,
         )
 
         assert result.filter_attributes is not None
-        assert result.filter_attributes["name"] == ["admin"]
+        assert result.filter_attributes["role__name"] == ["admin"]
 
 
 class TestFilterBy:
@@ -678,7 +707,7 @@ class TestFilterBy:
         )
 
         result = await UserFacetCrud.offset_paginate(
-            db_session, filter_by={"username": "alice"}
+            db_session, filter_by={"username": "alice"}, schema=UserRead
         )
 
         assert len(result.data) == 1
@@ -701,7 +730,7 @@ class TestFilterBy:
         )
 
         result = await UserFacetCrud.offset_paginate(
-            db_session, filter_by={"username": ["alice", "bob"]}
+            db_session, filter_by={"username": ["alice", "bob"]}, schema=UserRead
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -726,7 +755,7 @@ class TestFilterBy:
         )
 
         result = await UserRelFacetCrud.offset_paginate(
-            db_session, filter_by={"name": "admin"}
+            db_session, filter_by={"role__name": "admin"}, schema=UserRead
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -749,6 +778,7 @@ class TestFilterBy:
             db_session,
             filters=[User.is_active == True],  # noqa: E712
             filter_by={"username": ["alice", "alice2"]},
+            schema=UserRead,
         )
 
         # Only alice passes both: is_active=True AND username IN [alice, alice2]
@@ -763,7 +793,7 @@ class TestFilterBy:
 
         with pytest.raises(InvalidFacetFilterError) as exc_info:
             await UserFacetCrud.offset_paginate(
-                db_session, filter_by={"nonexistent": "value"}
+                db_session, filter_by={"nonexistent": "value"}, schema=UserRead
             )
 
         assert exc_info.value.key == "nonexistent"
@@ -794,7 +824,8 @@ class TestFilterBy:
 
         result = await UserRoleFacetCrud.offset_paginate(
             db_session,
-            filter_by={"name": "admin", "id": str(admin.id)},
+            filter_by={"role__name": "admin", "role__id": str(admin.id)},
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -815,7 +846,7 @@ class TestFilterBy:
         )
 
         result = await UserFacetCursorCrud.cursor_paginate(
-            db_session, filter_by={"username": "alice"}
+            db_session, filter_by={"username": "alice"}, schema=UserRead
         )
 
         assert len(result.data) == 1
@@ -839,7 +870,7 @@ class TestFilterBy:
         )
 
         result = await UserFacetCrud.offset_paginate(
-            db_session, filter_by=UserFilter(username="alice")
+            db_session, filter_by=UserFilter(username="alice"), schema=UserRead
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -865,7 +896,7 @@ class TestFilterBy:
         )
 
         result = await UserFacetCursorCrud.cursor_paginate(
-            db_session, filter_by=UserFilter(username="alice")
+            db_session, filter_by=UserFilter(username="alice"), schema=UserRead
         )
 
         assert len(result.data) == 1
@@ -885,15 +916,15 @@ class TestFilterParamsSchema:
         param_names = set(inspect.signature(dep).parameters)
         assert param_names == {"username", "email"}
 
-    def test_relationship_facet_uses_column_key(self):
+    def test_relationship_facet_uses_full_chain_key(self):
-        """Relationship tuple uses the terminal column's key."""
+        """Relationship tuple uses the full chain joined by __ as the key."""
         import inspect
 
         UserRoleCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
         dep = UserRoleCrud.filter_params()
 
         param_names = set(inspect.signature(dep).parameters)
-        assert param_names == {"name"}
+        assert param_names == {"role__name"}
 
     def test_raises_when_no_facet_fields(self):
         """ValueError raised when no facet_fields are configured or provided."""
@@ -947,6 +978,22 @@ class TestFilterParamsSchema:
         keys = facet_keys([(rel_a, col_a), (rel_b, col_b)])
         assert keys == ["project__name", "os__name"]
 
+    def test_deep_chain_joins_all_segments(self):
+        """Three-element tuple produces all relation segments joined by __."""
+        from unittest.mock import MagicMock
+
+        from fastapi_toolsets.crud.search import facet_keys
+
+        rel_a = MagicMock()
+        rel_a.key = "role"
+        rel_b = MagicMock()
+        rel_b.key = "permission"
+        col = MagicMock()
+        col.key = "name"
+
+        keys = facet_keys([(rel_a, rel_b, col)])
+        assert keys == ["role__permission__name"]
+
     def test_unique_column_keys_kept_plain(self):
         """Fields with unique column keys are not prefixed."""
         from fastapi_toolsets.crud.search import facet_keys
@@ -959,7 +1006,7 @@ 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):
@@ -974,7 +1021,9 @@ class TestFilterParamsSchema:
 
         dep = UserFacetCrud.filter_params()
         f = await dep(username=["alice"])
-        result = await UserFacetCrud.offset_paginate(db_session, filter_by=f)
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by=f, schema=UserRead
+        )
 
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
@@ -995,7 +1044,9 @@ class TestFilterParamsSchema:
 
         dep = UserFacetCursorCrud.filter_params()
         f = await dep(username=["alice"])
-        result = await UserFacetCursorCrud.cursor_paginate(db_session, filter_by=f)
+        result = await UserFacetCursorCrud.cursor_paginate(
+            db_session, filter_by=f, schema=UserRead
+        )
 
         assert len(result.data) == 1
         assert result.data[0].username == "alice"
@@ -1013,7 +1064,9 @@ class TestFilterParamsSchema:
 
         dep = UserFacetCrud.filter_params()
         f = await dep()  # all fields None
-        result = await UserFacetCrud.offset_paginate(db_session, filter_by=f)
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by=f, schema=UserRead
+        )
 
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
@@ -1158,3 +1211,245 @@ 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

@@ -4,18 +4,25 @@ import asyncio
 import uuid
 
 import pytest
+from sqlalchemy import text
+from sqlalchemy.engine import make_url
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.orm import DeclarativeBase
 
 from fastapi_toolsets.db import (
     LockMode,
+    cleanup_tables,
+    create_database,
     create_db_context,
     create_db_dependency,
     get_transaction,
     lock_tables,
     wait_for_row_change,
 )
+from fastapi_toolsets.exceptions import NotFoundError
+from fastapi_toolsets.pytest import create_db_session
 
-from .conftest import DATABASE_URL, Base, Role, RoleCrud, User
+from .conftest import DATABASE_URL, Base, Role, RoleCrud, User, UserCrud
 
 
 class TestCreateDbDependency:
@@ -61,6 +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."""
@@ -307,9 +363,9 @@ class TestWaitForRowChange:
 
     @pytest.mark.anyio
     async def test_nonexistent_row_raises(self, db_session: AsyncSession):
-        """Raises LookupError when the row does not exist."""
+        """Raises NotFoundError when the row does not exist."""
         fake_id = uuid.uuid4()
-        with pytest.raises(LookupError, match="not found"):
+        with pytest.raises(NotFoundError, match="not found"):
             await wait_for_row_change(db_session, Role, fake_id, interval=0.05)
 
     @pytest.mark.anyio
@@ -326,7 +382,7 @@ class TestWaitForRowChange:
 
     @pytest.mark.anyio
     async def test_deleted_row_raises(self, db_session: AsyncSession, engine):
-        """Raises LookupError when the row is deleted during polling."""
+        """Raises NotFoundError when the row is deleted during polling."""
         role = Role(name="delete_role")
         db_session.add(role)
         await db_session.commit()
@@ -340,6 +396,87 @@ class TestWaitForRowChange:
                 await other.commit()
 
         delete_task = asyncio.create_task(delete_later())
-        with pytest.raises(LookupError):
+        with pytest.raises(NotFoundError):
             await wait_for_row_change(db_session, Role, role.id, interval=0.05)
         await delete_task
+
+
+class TestCreateDatabase:
+    """Tests for create_database."""
+
+    @pytest.mark.anyio
+    async def test_creates_database(self):
+        """Database is created by create_database."""
+        target_url = (
+            make_url(DATABASE_URL)
+            .set(database="test_create_db_general")
+            .render_as_string(hide_password=False)
+        )
+        expected_db = make_url(target_url).database
+        assert expected_db is not None
+
+        engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
+        try:
+            async with engine.connect() as conn:
+                await conn.execute(text(f"DROP DATABASE IF EXISTS {expected_db}"))
+
+            await create_database(db_name=expected_db, server_url=DATABASE_URL)
+
+            async with engine.connect() as conn:
+                result = await conn.execute(
+                    text("SELECT 1 FROM pg_database WHERE datname = :name"),
+                    {"name": expected_db},
+                )
+                assert result.scalar() == 1
+
+            # Cleanup
+            async with engine.connect() as conn:
+                await conn.execute(text(f"DROP DATABASE IF EXISTS {expected_db}"))
+        finally:
+            await engine.dispose()
+
+
+class TestCleanupTables:
+    """Tests for cleanup_tables helper."""
+
+    @pytest.mark.anyio
+    async def test_truncates_all_tables(self):
+        """All table rows are removed after cleanup_tables."""
+        async with create_db_session(DATABASE_URL, Base, drop_tables=True) as session:
+            role = Role(id=uuid.uuid4(), name="cleanup_role")
+            session.add(role)
+            await session.flush()
+
+            user = User(
+                id=uuid.uuid4(),
+                username="cleanup_user",
+                email="cleanup@test.com",
+                role_id=role.id,
+            )
+            session.add(user)
+            await session.commit()
+
+            # Verify rows exist
+            roles_count = await RoleCrud.count(session)
+            users_count = await UserCrud.count(session)
+            assert roles_count == 1
+            assert users_count == 1
+
+            await cleanup_tables(session, Base)
+
+            # Verify tables are empty
+            roles_count = await RoleCrud.count(session)
+            users_count = await UserCrud.count(session)
+            assert roles_count == 0
+            assert users_count == 0
+
+    @pytest.mark.anyio
+    async def test_noop_for_empty_metadata(self):
+        """cleanup_tables does not raise when metadata has no tables."""
+
+        class EmptyBase(DeclarativeBase):
+            pass
+
+        async with create_db_session(DATABASE_URL, Base, drop_tables=True) as session:
+            # Should not raise
+            await cleanup_tables(session, EmptyBase)

tests/test_dependencies.py

@@ -3,20 +3,42 @@
 import inspect
 import uuid
 from collections.abc import AsyncGenerator
-from typing import Any, cast
+from typing import Annotated, Any, cast
 
 import pytest
 from fastapi.params import Depends
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from fastapi_toolsets.dependencies import BodyDependency, PathDependency
+from fastapi_toolsets.dependencies import (
+    BodyDependency,
+    PathDependency,
+    _unwrap_session_dep,
+)
 
 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)]
+
+
+class TestUnwrapSessionDep:
+    def test_plain_callable_returned_as_is(self):
+        """Plain callable is returned unchanged."""
+        assert _unwrap_session_dep(mock_get_db) is mock_get_db
+
+    def test_annotated_with_depends_unwrapped(self):
+        """Annotated form with Depends is unwrapped to the plain callable."""
+        assert _unwrap_session_dep(MockSessionDep) is mock_get_db
+
+    def test_annotated_without_depends_returned_as_is(self):
+        """Annotated form with no Depends falls back to returning session_dep as-is."""
+        annotated_no_dep = Annotated[AsyncSession, "not_a_depends"]
+        assert _unwrap_session_dep(annotated_no_dep) is annotated_no_dep
 
 
 class TestPathDependency:
@@ -95,6 +117,39 @@ class TestPathDependency:
         assert result.id == role.id
         assert result.name == "test_role"
 
+    def test_annotated_session_dep_returns_depends_instance(self):
+        """PathDependency accepts Annotated[AsyncSession, Depends(...)] form."""
+        dep = PathDependency(Role, Role.id, session_dep=MockSessionDep)
+        assert isinstance(dep, Depends)
+
+    def test_annotated_session_dep_signature(self):
+        """PathDependency with Annotated session_dep produces a valid signature."""
+        dep = cast(Any, PathDependency(Role, Role.id, session_dep=MockSessionDep))
+        sig = inspect.signature(dep.dependency)
+
+        assert "role_id" in sig.parameters
+        assert "session" in sig.parameters
+        assert isinstance(sig.parameters["session"].default, Depends)
+
+    def test_annotated_session_dep_unwraps_callable(self):
+        """PathDependency with Annotated form uses the underlying callable, not the Annotated type."""
+        dep = cast(Any, PathDependency(Role, Role.id, session_dep=MockSessionDep))
+        sig = inspect.signature(dep.dependency)
+
+        inner_dep = sig.parameters["session"].default
+        assert inner_dep.dependency is mock_get_db
+
+    @pytest.mark.anyio
+    async def test_annotated_session_dep_fetches_object(self, db_session):
+        """PathDependency with Annotated session_dep correctly fetches object from database."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="annotated_role"))
+
+        dep = cast(Any, PathDependency(Role, Role.id, session_dep=MockSessionDep))
+        result = await dep.dependency(session=db_session, role_id=role.id)
+
+        assert result.id == role.id
+        assert result.name == "annotated_role"
+
 
 class TestBodyDependency:
     """Tests for BodyDependency factory."""
@@ -184,3 +239,39 @@ class TestBodyDependency:
 
         assert result.id == role.id
         assert result.name == "body_test_role"
+
+    def test_annotated_session_dep_returns_depends_instance(self):
+        """BodyDependency accepts Annotated[AsyncSession, Depends(...)] form."""
+        dep = BodyDependency(
+            Role, Role.id, session_dep=MockSessionDep, body_field="role_id"
+        )
+        assert isinstance(dep, Depends)
+
+    def test_annotated_session_dep_unwraps_callable(self):
+        """BodyDependency with Annotated form uses the underlying callable, not the Annotated type."""
+        dep = cast(
+            Any,
+            BodyDependency(
+                Role, Role.id, session_dep=MockSessionDep, body_field="role_id"
+            ),
+        )
+        sig = inspect.signature(dep.dependency)
+
+        inner_dep = sig.parameters["session"].default
+        assert inner_dep.dependency is mock_get_db
+
+    @pytest.mark.anyio
+    async def test_annotated_session_dep_fetches_object(self, db_session):
+        """BodyDependency with Annotated session_dep correctly fetches object from database."""
+        role = await RoleCrud.create(db_session, RoleCreate(name="body_annotated_role"))
+
+        dep = cast(
+            Any,
+            BodyDependency(
+                Role, Role.id, session_dep=MockSessionDep, body_field="role_id"
+            ),
+        )
+        result = await dep.dependency(session=db_session, role_id=role.id)
+
+        assert result.id == role.id
+        assert result.name == "body_annotated_role"

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:
@@ -193,8 +182,7 @@ class TestOffsetPagination:
         body = resp.json()
         fa = body["filter_attributes"]
         assert set(fa["status"]) == {"draft", "published"}
-        # "name" is unique across all facet fields — no prefix needed
+        assert set(fa["category__name"]) == {"backend", "python"}
-        assert set(fa["name"]) == {"backend", "python"}
 
     @pytest.mark.anyio
     async def test_filter_attributes_scoped_to_filter(
@@ -393,3 +381,105 @@ class TestCursorSorting:
         body = resp.json()
         assert body["error_code"] == "SORT-422"
         assert body["status"] == "FAIL"
+
+
+class TestPaginateUnified:
+    """Tests for the unified GET /articles/ endpoint using paginate()."""
+
+    @pytest.mark.anyio
+    async def test_defaults_to_offset_pagination(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """Without pagination_type, defaults to offset pagination."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination_type"] == "offset"
+        assert "total_count" in body["pagination"]
+        assert body["pagination"]["total_count"] == 3
+
+    @pytest.mark.anyio
+    async def test_explicit_offset_pagination(self, client: AsyncClient, ex_db_session):
+        """pagination_type=offset returns OffsetPagination metadata."""
+        await seed(ex_db_session)
+
+        resp = await client.get(
+            "/articles/?pagination_type=offset&page=1&items_per_page=2"
+        )
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination_type"] == "offset"
+        assert body["pagination"]["total_count"] == 3
+        assert body["pagination"]["page"] == 1
+        assert body["pagination"]["has_more"] is True
+        assert len(body["data"]) == 2
+
+    @pytest.mark.anyio
+    async def test_cursor_pagination_type(self, client: AsyncClient, ex_db_session):
+        """pagination_type=cursor returns CursorPagination metadata."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/?pagination_type=cursor&items_per_page=2")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination_type"] == "cursor"
+        assert "next_cursor" in body["pagination"]
+        assert "total_count" not in body["pagination"]
+        assert body["pagination"]["has_more"] is True
+        assert len(body["data"]) == 2
+
+    @pytest.mark.anyio
+    async def test_cursor_pagination_navigate_pages(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """Cursor from first page can be used to fetch the next page."""
+        await seed(ex_db_session)
+
+        first = await client.get("/articles/?pagination_type=cursor&items_per_page=2")
+        assert first.status_code == 200
+        first_body = first.json()
+        next_cursor = first_body["pagination"]["next_cursor"]
+        assert next_cursor is not None
+
+        second = await client.get(
+            f"/articles/?pagination_type=cursor&items_per_page=2&cursor={next_cursor}"
+        )
+        assert second.status_code == 200
+        second_body = second.json()
+        assert second_body["pagination_type"] == "cursor"
+        assert second_body["pagination"]["has_more"] is False
+        assert len(second_body["data"]) == 1
+
+    @pytest.mark.anyio
+    async def test_cursor_pagination_with_search(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """paginate() with cursor type respects search parameter."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/?pagination_type=cursor&search=fastapi")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination_type"] == "cursor"
+        assert len(body["data"]) == 1
+        assert body["data"][0]["title"] == "FastAPI tips"
+
+    @pytest.mark.anyio
+    async def test_offset_pagination_with_filter(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """paginate() with offset type respects filter_by parameter."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/?pagination_type=offset&status=published")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination_type"] == "offset"
+        assert body["pagination"]["total_count"] == 2

tests/test_exceptions.py

@@ -2,6 +2,7 @@
 
 import pytest
 from fastapi import FastAPI
+from fastapi.exceptions import HTTPException
 from fastapi.testclient import TestClient
 
 from fastapi_toolsets.exceptions import (
@@ -36,8 +37,8 @@ class TestApiException:
         assert error.api_error.msg == "I'm a teapot"
         assert str(error) == "I'm a teapot"
 
-    def test_custom_detail_message(self):
+    def test_detail_overrides_msg_and_str(self):
-        """Custom detail overrides default message."""
+        """detail sets both str(exc) and api_error.msg; class-level msg is unchanged."""
 
         class CustomError(ApiException):
             api_error = ApiError(
@@ -47,8 +48,172 @@ class TestApiException:
                 err_code="BAD-400",
             )
 
-        error = CustomError("Custom message")
+        error = CustomError("Widget not found")
-        assert str(error) == "Custom message"
+        assert str(error) == "Widget not found"
+        assert error.api_error.msg == "Widget not found"
+        assert CustomError.api_error.msg == "Bad Request"  # class unchanged
+
+    def test_desc_override(self):
+        """desc kwarg overrides api_error.desc on the instance only."""
+
+        class MyError(ApiException):
+            api_error = ApiError(
+                code=400, msg="Error", desc="Default.", err_code="ERR-400"
+            )
+
+        err = MyError(desc="Custom desc.")
+        assert err.api_error.desc == "Custom desc."
+        assert MyError.api_error.desc == "Default."  # class unchanged
+
+    def test_data_override(self):
+        """data kwarg sets api_error.data on the instance only."""
+
+        class MyError(ApiException):
+            api_error = ApiError(
+                code=400, msg="Error", desc="Default.", err_code="ERR-400"
+            )
+
+        err = MyError(data={"key": "value"})
+        assert err.api_error.data == {"key": "value"}
+        assert MyError.api_error.data is None  # class unchanged
+
+    def test_desc_and_data_override(self):
+        """detail, desc and data can all be overridden together."""
+
+        class MyError(ApiException):
+            api_error = ApiError(
+                code=400, msg="Error", desc="Default.", err_code="ERR-400"
+            )
+
+        err = MyError("custom msg", desc="New desc.", data={"x": 1})
+        assert str(err) == "custom msg"
+        assert err.api_error.msg == "custom msg"  # detail also updates msg
+        assert err.api_error.desc == "New desc."
+        assert err.api_error.data == {"x": 1}
+        assert err.api_error.code == 400  # other fields unchanged
+
+    def test_class_api_error_not_mutated_after_instance_override(self):
+        """Raising with desc/data does not mutate the class-level api_error."""
+
+        class MyError(ApiException):
+            api_error = ApiError(
+                code=400, msg="Error", desc="Default.", err_code="ERR-400"
+            )
+
+        MyError(desc="Changed", data={"x": 1})
+        assert MyError.api_error.desc == "Default."
+        assert MyError.api_error.data is None
+
+    def test_subclass_uses_super_with_desc_and_data(self):
+        """Subclasses can delegate detail/desc/data to super().__init__()."""
+
+        class BuildValidationError(ApiException):
+            api_error = ApiError(
+                code=422,
+                msg="Build Validation Error",
+                desc="The build configuration is invalid.",
+                err_code="BUILD-422",
+            )
+
+            def __init__(self, *errors: str) -> None:
+                super().__init__(
+                    f"{len(errors)} validation error(s)",
+                    desc=", ".join(errors),
+                    data={"errors": [{"message": e} for e in errors]},
+                )
+
+        err = BuildValidationError("Field A is required", "Field B is invalid")
+        assert str(err) == "2 validation error(s)"
+        assert err.api_error.msg == "2 validation error(s)"  # detail set msg
+        assert err.api_error.desc == "Field A is required, Field B is invalid"
+        assert err.api_error.data == {
+            "errors": [
+                {"message": "Field A is required"},
+                {"message": "Field B is invalid"},
+            ]
+        }
+        assert err.api_error.code == 422  # other fields unchanged
+
+    def test_detail_desc_data_in_http_response(self):
+        """detail/desc/data overrides all appear correctly in the FastAPI HTTP response."""
+
+        class DynamicError(ApiException):
+            api_error = ApiError(
+                code=400, msg="Error", desc="Default.", err_code="ERR-400"
+            )
+
+            def __init__(self, message: str) -> None:
+                super().__init__(
+                    message,
+                    desc=f"Detail: {message}",
+                    data={"reason": message},
+                )
+
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/error")
+        async def raise_error():
+            raise DynamicError("something went wrong")
+
+        client = TestClient(app)
+        response = client.get("/error")
+
+        assert response.status_code == 400
+        body = response.json()
+        assert body["message"] == "something went wrong"
+        assert body["description"] == "Detail: something went wrong"
+        assert body["data"] == {"reason": "something went wrong"}
+
+
+class TestApiExceptionGuard:
+    """Tests for the __init_subclass__ api_error guard."""
+
+    def test_missing_api_error_raises_type_error(self):
+        """Defining a subclass without api_error raises TypeError at class creation time."""
+        with pytest.raises(
+            TypeError, match="must define an 'api_error' class attribute"
+        ):
+
+            class BrokenError(ApiException):
+                pass
+
+    def test_abstract_subclass_skips_guard(self):
+        """abstract=True allows intermediate base classes without api_error."""
+
+        class BaseGroupError(ApiException, abstract=True):
+            pass
+
+        # Concrete child must still define it
+        class ConcreteError(BaseGroupError):
+            api_error = ApiError(
+                code=400, msg="Error", desc="Desc.", err_code="ERR-400"
+            )
+
+        err = ConcreteError()
+        assert err.api_error.code == 400
+
+    def test_abstract_child_still_requires_api_error_on_concrete(self):
+        """Concrete subclass of an abstract class must define api_error."""
+
+        class Base(ApiException, abstract=True):
+            pass
+
+        with pytest.raises(
+            TypeError, match="must define an 'api_error' class attribute"
+        ):
+
+            class Concrete(Base):
+                pass
+
+    def test_inherited_api_error_satisfies_guard(self):
+        """Subclass that inherits api_error from a parent does not need its own."""
+
+        class ConcreteError(NotFoundError):
+            pass
+
+        err = ConcreteError()
+        assert err.api_error.code == 404
 
 
 class TestBuiltInExceptions:
@@ -90,7 +255,7 @@ class TestGenerateErrorResponses:
         assert responses[404]["description"] == "Not Found"
 
     def test_generates_multiple_responses(self):
-        """Generates responses for multiple exceptions."""
+        """Generates responses for multiple exceptions with distinct status codes."""
         responses = generate_error_responses(
             UnauthorizedError,
             ForbiddenError,
@@ -101,15 +266,24 @@ class TestGenerateErrorResponses:
         assert 403 in responses
         assert 404 in responses
 
-    def test_response_has_example(self):
+    def test_response_has_named_example(self):
-        """Generated response includes example."""
+        """Generated response uses named examples keyed by err_code."""
         responses = generate_error_responses(NotFoundError)
-        example = responses[404]["content"]["application/json"]["example"]
+        examples = responses[404]["content"]["application/json"]["examples"]
 
-        assert example["status"] == "FAIL"
+        assert "RES-404" in examples
-        assert example["error_code"] == "RES-404"
+        value = examples["RES-404"]["value"]
-        assert example["message"] == "Not Found"
+        assert value["status"] == "FAIL"
-        assert example["data"] is None
+        assert value["error_code"] == "RES-404"
+        assert value["message"] == "Not Found"
+        assert value["data"] is None
+
+    def test_response_example_has_summary(self):
+        """Each named example carries a summary equal to api_error.msg."""
+        responses = generate_error_responses(NotFoundError)
+        example = responses[404]["content"]["application/json"]["examples"]["RES-404"]
+
+        assert example["summary"] == "Not Found"
 
     def test_response_example_with_data(self):
         """Generated response includes data when set on ApiError."""
@@ -124,9 +298,49 @@ class TestGenerateErrorResponses:
             )
 
         responses = generate_error_responses(ErrorWithData)
-        example = responses[400]["content"]["application/json"]["example"]
+        value = responses[400]["content"]["application/json"]["examples"]["BAD-400"][
+            "value"
+        ]
 
-        assert example["data"] == {"details": "some context"}
+        assert value["data"] == {"details": "some context"}
+
+    def test_two_errors_same_code_both_present(self):
+        """Two exceptions with the same HTTP code produce two named examples."""
+
+        class BadRequestA(ApiException):
+            api_error = ApiError(
+                code=400, msg="Bad A", desc="Reason A.", err_code="ERR-A"
+            )
+
+        class BadRequestB(ApiException):
+            api_error = ApiError(
+                code=400, msg="Bad B", desc="Reason B.", err_code="ERR-B"
+            )
+
+        responses = generate_error_responses(BadRequestA, BadRequestB)
+
+        assert 400 in responses
+        examples = responses[400]["content"]["application/json"]["examples"]
+        assert "ERR-A" in examples
+        assert "ERR-B" in examples
+        assert examples["ERR-A"]["value"]["message"] == "Bad A"
+        assert examples["ERR-B"]["value"]["message"] == "Bad B"
+
+    def test_two_errors_same_code_single_top_level_entry(self):
+        """Two exceptions with the same HTTP code produce exactly one top-level entry."""
+
+        class BadRequestA(ApiException):
+            api_error = ApiError(
+                code=400, msg="Bad A", desc="Reason A.", err_code="ERR-A"
+            )
+
+        class BadRequestB(ApiException):
+            api_error = ApiError(
+                code=400, msg="Bad B", desc="Reason B.", err_code="ERR-B"
+            )
+
+        responses = generate_error_responses(BadRequestA, BadRequestB)
+        assert len([k for k in responses if k == 400]) == 1
 
 
 class TestInitExceptionsHandlers:
@@ -250,13 +464,68 @@ class TestInitExceptionsHandlers:
         assert data["status"] == "FAIL"
         assert data["error_code"] == "SERVER-500"
 
-    def test_custom_openapi_schema(self):
+    def test_handles_http_exception(self):
-        """Customizes OpenAPI schema for 422 responses."""
+        """Handles starlette HTTPException with consistent ErrorResponse envelope."""
         app = FastAPI()
         init_exceptions_handlers(app)
 
+        @app.get("/protected")
+        async def protected():
+            raise HTTPException(status_code=403, detail="Forbidden")
+
+        client = TestClient(app)
+        response = client.get("/protected")
+
+        assert response.status_code == 403
+        data = response.json()
+        assert data["status"] == "FAIL"
+        assert data["error_code"] == "HTTP-403"
+        assert data["message"] == "Forbidden"
+
+    def test_handles_http_exception_404_from_route(self):
+        """HTTPException(404) raised inside a route uses the consistent ErrorResponse envelope."""
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/items/{item_id}")
+        async def get_item(item_id: int):
+            raise HTTPException(status_code=404, detail="Item not found")
+
+        client = TestClient(app)
+        response = client.get("/items/99")
+
+        assert response.status_code == 404
+        data = response.json()
+        assert data["status"] == "FAIL"
+        assert data["error_code"] == "HTTP-404"
+        assert data["message"] == "Item not found"
+
+    def test_handles_http_exception_forwards_headers(self):
+        """HTTPException with WWW-Authenticate header forwards it in the response."""
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/secure")
+        async def secure():
+            raise HTTPException(
+                status_code=401,
+                detail="Not authenticated",
+                headers={"WWW-Authenticate": "Bearer"},
+            )
+
+        client = TestClient(app)
+        response = client.get("/secure")
+
+        assert response.status_code == 401
+        assert response.headers.get("www-authenticate") == "Bearer"
+
+    def test_custom_openapi_schema(self):
+        """Customises OpenAPI schema for 422 responses using named examples."""
         from pydantic import BaseModel
 
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
         class Item(BaseModel):
             name: str
 
@@ -269,8 +538,128 @@ class TestInitExceptionsHandlers:
         post_op = openapi["paths"]["/items"]["post"]
         assert "422" in post_op["responses"]
         resp_422 = post_op["responses"]["422"]
-        example = resp_422["content"]["application/json"]["example"]
+        examples = resp_422["content"]["application/json"]["examples"]
-        assert example["error_code"] == "VAL-422"
+        assert "VAL-422" in examples
+        assert examples["VAL-422"]["value"]["error_code"] == "VAL-422"
+
+    def test_custom_openapi_preserves_app_metadata(self):
+        """_patched_openapi preserves custom FastAPI app-level metadata."""
+        app = FastAPI(
+            title="My API",
+            version="2.0.0",
+            description="Custom description",
+        )
+        init_exceptions_handlers(app)
+
+        schema = app.openapi()
+        assert schema["info"]["title"] == "My API"
+        assert schema["info"]["version"] == "2.0.0"
+
+    def test_handles_response_validation_error(self):
+        """Handles ResponseValidationError with a structured 422 response."""
+        from pydantic import BaseModel
+
+        class CountResponse(BaseModel):
+            count: int
+
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/broken", response_model=CountResponse)
+        async def broken():
+            return {"count": "not-a-number"}  # triggers ResponseValidationError
+
+        client = TestClient(app, raise_server_exceptions=False)
+        response = client.get("/broken")
+
+        assert response.status_code == 422
+        data = response.json()
+        assert data["status"] == "FAIL"
+        assert data["error_code"] == "VAL-422"
+        assert "errors" in data["data"]
+
+    def test_handles_validation_error_with_non_standard_loc(self):
+        """Validation error with empty loc tuple maps the field to 'root'."""
+        from fastapi.exceptions import RequestValidationError
+
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/root-error")
+        async def root_error():
+            raise RequestValidationError(
+                [
+                    {
+                        "type": "custom",
+                        "loc": (),
+                        "msg": "root level error",
+                        "input": None,
+                        "url": "",
+                    }
+                ]
+            )
+
+        client = TestClient(app)
+        response = client.get("/root-error")
+
+        assert response.status_code == 422
+        data = response.json()
+        assert data["data"]["errors"][0]["field"] == "root"
+
+    def test_openapi_schema_cached_after_first_call(self):
+        """app.openapi() returns the cached schema on subsequent calls."""
+        from pydantic import BaseModel
+
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        class Item(BaseModel):
+            name: str
+
+        @app.post("/items")
+        async def create_item(item: Item):
+            return item
+
+        schema_first = app.openapi()
+        schema_second = app.openapi()
+        assert schema_first is schema_second
+
+    def test_openapi_skips_operations_without_422(self):
+        """_patched_openapi leaves operations that have no 422 response unchanged."""
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/ping")
+        async def ping():
+            return {"ok": True}
+
+        schema = app.openapi()
+        get_op = schema["paths"]["/ping"]["get"]
+        assert "422" not in get_op["responses"]
+        assert "200" in get_op["responses"]
+
+    def test_openapi_skips_non_dict_path_item_values(self):
+        """_patched_openapi ignores non-dict values in path items (e.g. path-level parameters)."""
+        from fastapi_toolsets.exceptions.handler import _patched_openapi
+
+        app = FastAPI()
+
+        def fake_openapi() -> dict:
+            return {
+                "paths": {
+                    "/items": {
+                        "parameters": [
+                            {"name": "q", "in": "query"}
+                        ],  # list, not a dict
+                        "get": {"responses": {"200": {"description": "OK"}}},
+                    }
+                }
+            }
+
+        schema = _patched_openapi(app, fake_openapi)
+        # The list value was skipped without error; the GET operation is intact
+        assert schema["paths"]["/items"]["parameters"] == [{"name": "q", "in": "query"}]
+        assert "422" not in schema["paths"]["/items"]["get"]["responses"]
 
 
 class TestExceptionIntegration:
@@ -352,12 +741,12 @@ class TestInvalidOrderFieldError:
         assert error.field == "unknown"
         assert error.valid_fields == ["name", "created_at"]
 
-    def test_message_contains_field_and_valid_fields(self):
+    def test_description_contains_field_and_valid_fields(self):
-        """Exception message mentions the bad field and valid options."""
+        """api_error.desc mentions the bad field and valid options."""
         error = InvalidOrderFieldError("bad_field", ["name", "email"])
-        assert "bad_field" in str(error)
+        assert "bad_field" in error.api_error.desc
-        assert "name" in str(error)
+        assert "name" in error.api_error.desc
-        assert "email" in str(error)
+        assert "email" in error.api_error.desc
 
     def test_handled_as_422_by_exception_handler(self):
         """init_exceptions_handlers turns InvalidOrderFieldError into a 422 response."""

tests/test_fixtures.py

@@ -1,6 +1,7 @@
 """Tests for fastapi_toolsets.fixtures module."""
 
 import uuid
+from enum import Enum
 
 import pytest
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -13,8 +14,22 @@ from fastapi_toolsets.fixtures import (
     load_fixtures,
     load_fixtures_by_context,
 )
+from fastapi_toolsets.fixtures.utils import _get_primary_key, _instance_to_dict
 
-from .conftest import Role, User
+from .conftest import IntRole, Permission, Role, RoleCreate, 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:
@@ -37,6 +52,86 @@ class TestContext:
         assert Context.TESTING.value == "testing"
 
 
+class TestCustomEnumContext:
+    """Custom Enum types are accepted wherever Context/str are expected."""
+
+    def test_cannot_subclass_context_with_members(self):
+        """Python prohibits extending an Enum that already has members."""
+        with pytest.raises(TypeError):
+
+            class MyContext(Context):  # noqa: F841  # ty: ignore[subclass-of-final-class]
+                STAGING = "staging"
+
+    def test_custom_enum_values_interchangeable_with_context(self):
+        """A custom enum with the same .value as a built-in Context member is
+        treated as the same context — fixtures registered under one are found
+        by the other."""
+
+        class AppContextFull(str, Enum):
+            BASE = "base"
+            STAGING = "staging"
+
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[Context.BASE])
+        def roles():
+            return []
+
+        # AppContextFull.BASE has value "base" — same as Context.BASE
+        fixtures = registry.get_by_context(AppContextFull.BASE)
+        assert len(fixtures) == 1
+
+    def test_custom_enum_registry_default_contexts(self):
+        """FixtureRegistry(contexts=[...]) accepts a custom Enum."""
+        registry = FixtureRegistry(contexts=[AppContext.STAGING])
+
+        @registry.register
+        def data():
+            return []
+
+        fixture = registry.get("data")
+        assert fixture.contexts == ["staging"]
+
+    def test_custom_enum_resolve_context_dependencies(self):
+        """resolve_context_dependencies accepts a custom Enum context."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[AppContext.STAGING])
+        def staging_roles():
+            return []
+
+        order = registry.resolve_context_dependencies(AppContext.STAGING)
+        assert "staging_roles" in order
+
+    @pytest.mark.anyio
+    async def test_custom_enum_e2e(self, db_session: AsyncSession):
+        """End-to-end: register with custom Enum, load with the same Enum."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[AppContext.STAGING])
+        def staging_roles():
+            return [Role(id=uuid.uuid4(), name="staging-admin")]
+
+        result = await load_fixtures_by_context(
+            db_session, registry, AppContext.STAGING
+        )
+        assert len(result["staging_roles"]) == 1
+
+    @pytest.mark.anyio
+    async def test_plain_enum_e2e(self, db_session: AsyncSession):
+        """End-to-end: register with plain Enum, load with the same Enum."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[PlainEnumContext.STAGING])
+        def staging_roles():
+            return [Role(id=uuid.uuid4(), name="plain-staging-admin")]
+
+        result = await load_fixtures_by_context(
+            db_session, registry, PlainEnumContext.STAGING
+        )
+        assert len(result["staging_roles"]) == 1
+
+
 class TestLoadStrategy:
     """Tests for LoadStrategy enum."""
 
@@ -405,6 +500,37 @@ class TestDependencyResolution:
         with pytest.raises(ValueError, match="Circular dependency"):
             registry.resolve_dependencies("a")
 
+    def test_resolve_raises_for_unknown_dependency(self):
+        """KeyError when depends_on references an unregistered fixture."""
+        registry = FixtureRegistry()
+
+        @registry.register(depends_on=["ghost"])
+        def users():
+            return []
+
+        with pytest.raises(KeyError, match="ghost"):
+            registry.resolve_dependencies("users")
+
+    def test_resolve_deduplicates_shared_depends_on_across_variants(self):
+        """A dep shared by two same-name variants appears only once in the order."""
+        registry = FixtureRegistry()
+
+        @registry.register(contexts=[Context.BASE])
+        def roles():
+            return []
+
+        @registry.register(depends_on=["roles"], contexts=[Context.BASE])
+        def items():
+            return []
+
+        @registry.register(depends_on=["roles"], contexts=[Context.TESTING])
+        def items():  # noqa: F811
+            return []
+
+        order = registry.resolve_dependencies("items")
+        assert order.count("roles") == 1
+        assert order.index("roles") < order.index("items")
+
     def test_resolve_context_dependencies(self):
         """Resolve all fixtures for a context with dependencies."""
         registry = FixtureRegistry()
@@ -445,8 +571,6 @@ class TestLoadFixtures:
         assert "roles" in result
         assert len(result["roles"]) == 2
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 2
 
@@ -477,8 +601,6 @@ 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
 
@@ -495,11 +617,55 @@ 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
 
+    @pytest.mark.anyio
+    async def test_merge_does_not_overwrite_omitted_nullable_columns(
+        self, db_session: AsyncSession
+    ):
+        """MERGE must not clear nullable columns that the fixture didn't set.
+
+        When a fixture omits a nullable column (e.g. role_id or notes), a re-merge
+        must leave the existing DB value untouched — not overwrite it with NULL.
+        """
+        registry = FixtureRegistry()
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        uid = uuid.uuid4()
+
+        # First load: user has role_id and notes set
+        @registry.register
+        def users():
+            return [
+                User(
+                    id=uid,
+                    username="alice",
+                    email="a@test.com",
+                    role_id=admin.id,
+                    notes="original",
+                )
+            ]
+
+        await load_fixtures(db_session, registry, "users", strategy=LoadStrategy.MERGE)
+
+        # Second load: fixture omits role_id and notes
+        registry2 = FixtureRegistry()
+
+        @registry2.register
+        def users():  # noqa: F811
+            return [User(id=uid, username="alice-updated", email="a@test.com")]
+
+        await load_fixtures(db_session, registry2, "users", strategy=LoadStrategy.MERGE)
+
+        from sqlalchemy import select
+
+        row = (
+            await db_session.execute(select(User).where(User.id == uid))
+        ).scalar_one()
+        assert row.username == "alice-updated"  # updated column changed
+        assert row.role_id == admin.id  # omitted → preserved
+        assert row.notes == "original"  # omitted → preserved
+
     @pytest.mark.anyio
     async def test_load_with_skip_existing_strategy(self, db_session: AsyncSession):
         """Load fixtures with SKIP_EXISTING strategy."""
@@ -524,8 +690,6 @@ 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"
@@ -551,8 +715,6 @@ class TestLoadFixtures:
         assert "roles" in result
         assert len(result["roles"]) == 2
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 2
 
@@ -592,11 +754,49 @@ class TestLoadFixtures:
         assert "roles" in result
         assert "other_roles" in result
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 2
 
+    @pytest.mark.anyio
+    async def test_skip_existing_skips_if_record_exists(self, db_session: AsyncSession):
+        """SKIP_EXISTING returns empty loaded list when the record already exists."""
+        registry = FixtureRegistry()
+        role_id = uuid.uuid4()
+
+        @registry.register
+        def roles():
+            return [Role(id=role_id, name="admin")]
+
+        # First load — inserts the record.
+        result1 = await load_fixtures(
+            db_session, registry, "roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert len(result1["roles"]) == 1
+
+        # Remove from identity map so session.get() queries the DB in the second load.
+        db_session.expunge_all()
+
+        # Second load — record exists in DB, nothing should be added.
+        result2 = await load_fixtures(
+            db_session, registry, "roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert result2["roles"] == []
+
+    @pytest.mark.anyio
+    async def test_skip_existing_null_pk_inserts(self, db_session: AsyncSession):
+        """SKIP_EXISTING inserts when the instance has no PK set (auto-increment)."""
+        registry = FixtureRegistry()
+
+        @registry.register
+        def int_roles():
+            # No id provided — PK is None before INSERT (autoincrement).
+            return [IntRole(name="member")]
+
+        result = await load_fixtures(
+            db_session, registry, "int_roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert len(result["int_roles"]) == 1
+
 
 class TestLoadFixturesByContext:
     """Tests for load_fixtures_by_context function."""
@@ -618,8 +818,6 @@ 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
 
@@ -646,8 +844,6 @@ class TestLoadFixturesByContext:
             db_session, registry, Context.BASE, Context.TESTING
         )
 
-        from .conftest import RoleCrud
-
         count = await RoleCrud.count(db_session)
         assert count == 2
 
@@ -675,8 +871,6 @@ 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
 
@@ -755,3 +949,161 @@ class TestGetObjByAttr:
         """Raises StopIteration when value type doesn't match."""
         with pytest.raises(StopIteration):
             get_obj_by_attr(self.roles, "id", "not-a-uuid")
+
+
+class TestGetPrimaryKey:
+    """Unit tests for the _get_primary_key helper (composite PK paths)."""
+
+    def test_composite_pk_all_set(self):
+        """Returns a tuple when all composite PK values are set."""
+        instance = Permission(subject="post", action="read")
+        pk = _get_primary_key(instance)
+        assert pk == ("post", "read")
+
+    def test_composite_pk_partial_none(self):
+        """Returns None when any composite PK value is None."""
+        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
+
+    def test_nullable_str_no_default_omitted_not_in_dict(self):
+        """Mapped[str | None] with no default, not provided in constructor, is absent from dict."""
+        instance = User(id=uuid.uuid4(), username="u", email="e@e.com")
+        d = _instance_to_dict(instance)
+        assert "notes" not in d
+
+    def test_nullable_str_no_default_explicit_none_included(self):
+        """Mapped[str | None] with no default, explicitly set to None, is included as NULL."""
+        instance = User(id=uuid.uuid4(), username="u", email="e@e.com", notes=None)
+        d = _instance_to_dict(instance)
+        assert "notes" in d
+        assert d["notes"] is None
+
+    def test_nullable_str_no_default_with_value_included(self):
+        """Mapped[str | None] with no default and a value set is included normally."""
+        instance = User(id=uuid.uuid4(), username="u", email="e@e.com", notes="hello")
+        d = _instance_to_dict(instance)
+        assert d["notes"] == "hello"
+
+    @pytest.mark.anyio
+    async def test_nullable_str_no_default_insert_roundtrip(
+        self, db_session: AsyncSession
+    ):
+        """Fixture loading works for models with Mapped[str | None] (no default).
+
+        Both the omitted-value (→ NULL) and explicit-None paths must insert without error.
+        """
+        registry = FixtureRegistry()
+
+        uid_a = uuid.uuid4()
+        uid_b = uuid.uuid4()
+        uid_c = uuid.uuid4()
+
+        @registry.register
+        def users():
+            return [
+                User(
+                    id=uid_a, username="no_notes", email="a@test.com"
+                ),  # notes omitted
+                User(
+                    id=uid_b, username="null_notes", email="b@test.com", notes=None
+                ),  # explicit None
+                User(
+                    id=uid_c, username="has_notes", email="c@test.com", notes="hi"
+                ),  # value set
+            ]
+
+        result = await load_fixtures(db_session, registry, "users")
+
+        from sqlalchemy import select
+
+        rows = (
+            (await db_session.execute(select(User).order_by(User.username)))
+            .scalars()
+            .all()
+        )
+        by_username = {r.username: r for r in rows}
+
+        assert by_username["no_notes"].notes is None
+        assert by_username["null_notes"].notes is None
+        assert by_username["has_notes"].notes == "hi"
+        assert len(result["users"]) == 3
+
+
+class TestBatchMergeNonPkColumns:
+    """Batch MERGE on a model with no non-PK columns (PK-only table)."""
+
+    @pytest.mark.anyio
+    async def test_merge_pk_only_model(self, db_session: AsyncSession):
+        """MERGE strategy on a PK-only model uses on_conflict_do_nothing."""
+        registry = FixtureRegistry()
+
+        @registry.register
+        def permissions():
+            return [
+                Permission(subject="post", action="read"),
+                Permission(subject="post", action="write"),
+            ]
+
+        result = await load_fixtures(
+            db_session, registry, "permissions", strategy=LoadStrategy.MERGE
+        )
+        assert len(result["permissions"]) == 2
+
+        # Run again — conflicts are silently ignored.
+        result2 = await load_fixtures(
+            db_session, registry, "permissions", strategy=LoadStrategy.MERGE
+        )
+        assert len(result2["permissions"]) == 2

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
 
@@ -159,6 +158,42 @@ class TestMetricsRegistry:
         assert registry.get_all()[0].func is second
 
 
+class TestGet:
+    """Tests for MetricsRegistry.get method."""
+
+    def test_get_returns_instance_after_init(self):
+        """get() returns the metric instance stored by init_metrics."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+
+        @registry.register
+        def my_gauge():
+            return Gauge("get_test_gauge", "A test gauge")
+
+        init_metrics(app, registry)
+
+        instance = registry.get("my_gauge")
+        assert isinstance(instance, Gauge)
+
+    def test_get_raises_for_registered_but_not_initialized(self):
+        """get() raises KeyError with an informative message when init_metrics was not called."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def my_counter():
+            return Counter("get_uninit_counter", "A counter")
+
+        with pytest.raises(KeyError, match="not been initialized yet"):
+            registry.get("my_counter")
+
+    def test_get_raises_for_unknown_name(self):
+        """get() raises KeyError when the metric name is not registered at all."""
+        registry = MetricsRegistry()
+
+        with pytest.raises(KeyError, match="Unknown metric"):
+            registry.get("nonexistent")
+
+
 class TestIncludeRegistry:
     """Tests for MetricsRegistry.include_registry method."""
 
@@ -251,6 +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()
@@ -258,26 +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):
@@ -409,36 +442,33 @@ class TestInitMetrics:
 class TestMultiProcessMode:
     """Tests for multi-process Prometheus mode."""
 
-    def test_multiprocess_with_env_var(self):
+    def test_multiprocess_with_env_var(self, monkeypatch):
         """Multi-process mode works when PROMETHEUS_MULTIPROC_DIR is set."""
         with tempfile.TemporaryDirectory() as tmpdir:
-            os.environ["PROMETHEUS_MULTIPROC_DIR"] = tmpdir
+            monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", tmpdir)
-            try:
+            # Use a separate registry to avoid conflicts with default
-                # Use a separate registry to avoid conflicts with default
+            prom_registry = CollectorRegistry()
-                prom_registry = CollectorRegistry()
+            app = FastAPI()
-                app = FastAPI()
+            registry = MetricsRegistry()
-                registry = MetricsRegistry()
 
-                @registry.register
+            @registry.register
-                def mp_counter():
+            def mp_counter():
-                    return Counter(
+                return Counter(
-                        "mp_test_counter",
+                    "mp_test_counter",
-                        "A multiprocess counter",
+                    "A multiprocess counter",
-                        registry=prom_registry,
+                    registry=prom_registry,
-                    )
+                )
 
-                init_metrics(app, registry)
+            init_metrics(app, registry)
 
-                client = TestClient(app)
+            client = TestClient(app)
-                response = client.get("/metrics")
+            response = client.get("/metrics")
 
-                assert response.status_code == 200
+            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_pytest.py

@@ -7,12 +7,12 @@ 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 DeclarativeBase, selectinload
+from sqlalchemy.orm import selectinload
 
+from fastapi_toolsets.db import get_transaction
 from fastapi_toolsets.fixtures import Context, FixtureRegistry
 from fastapi_toolsets.pytest import (
-    cleanup_tables,
     create_async_client,
     create_db_session,
     create_worker_database,
@@ -337,6 +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."""
@@ -406,7 +455,6 @@ class TestCreateWorkerDatabase:
         ) as url:
             assert make_url(url).database == expected_db
 
-            # Verify the database exists while inside the context
             engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
             async with engine.connect() as conn:
                 result = await conn.execute(
@@ -416,7 +464,6 @@ class TestCreateWorkerDatabase:
                 assert result.scalar() == 1
             await engine.dispose()
 
-        # After context exit the database should be dropped
         engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
         async with engine.connect() as conn:
             result = await conn.execute(
@@ -439,7 +486,6 @@ class TestCreateWorkerDatabase:
         async with create_worker_database(DATABASE_URL) as url:
             assert make_url(url).database == expected_db
 
-            # Verify the database exists while inside the context
             engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
             async with engine.connect() as conn:
                 result = await conn.execute(
@@ -449,7 +495,6 @@ class TestCreateWorkerDatabase:
                 assert result.scalar() == 1
             await engine.dispose()
 
-        # After context exit the database should be dropped
         engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
         async with engine.connect() as conn:
             result = await conn.execute(
@@ -467,18 +512,15 @@ class TestCreateWorkerDatabase:
             worker_database_url(DATABASE_URL, default_test_db="unused")
         ).database
 
-        # Pre-create the database to simulate a stale leftover
         engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
         async with engine.connect() as conn:
             await conn.execute(text(f"DROP DATABASE IF EXISTS {expected_db}"))
             await conn.execute(text(f"CREATE DATABASE {expected_db}"))
         await engine.dispose()
 
-        # Should succeed despite the database already existing
         async with create_worker_database(DATABASE_URL) as url:
             assert make_url(url).database == expected_db
 
-        # Verify cleanup after context exit
         engine = create_async_engine(DATABASE_URL, isolation_level="AUTOCOMMIT")
         async with engine.connect() as conn:
             result = await conn.execute(
@@ -487,49 +529,3 @@ class TestCreateWorkerDatabase:
             )
             assert result.scalar() is None
         await engine.dispose()
-
-
-class TestCleanupTables:
-    """Tests for cleanup_tables helper."""
-
-    @pytest.mark.anyio
-    async def test_truncates_all_tables(self):
-        """All table rows are removed after cleanup_tables."""
-        async with create_db_session(DATABASE_URL, Base, drop_tables=True) as session:
-            role = Role(id=uuid.uuid4(), name="cleanup_role")
-            session.add(role)
-            await session.flush()
-
-            user = User(
-                id=uuid.uuid4(),
-                username="cleanup_user",
-                email="cleanup@test.com",
-                role_id=role.id,
-            )
-            session.add(user)
-            await session.commit()
-
-            # Verify rows exist
-            roles_count = await RoleCrud.count(session)
-            users_count = await UserCrud.count(session)
-            assert roles_count == 1
-            assert users_count == 1
-
-            await cleanup_tables(session, Base)
-
-            # Verify tables are empty
-            roles_count = await RoleCrud.count(session)
-            users_count = await UserCrud.count(session)
-            assert roles_count == 0
-            assert users_count == 0
-
-    @pytest.mark.anyio
-    async def test_noop_for_empty_metadata(self):
-        """cleanup_tables does not raise when metadata has no tables."""
-
-        class EmptyBase(DeclarativeBase):
-            pass
-
-        async with create_db_session(DATABASE_URL, Base, drop_tables=True) as session:
-            # Should not raise
-            await cleanup_tables(session, EmptyBase)

tests/test_schemas.py

@@ -6,10 +6,12 @@ from pydantic import ValidationError
 from fastapi_toolsets.schemas import (
     ApiError,
     CursorPagination,
+    CursorPaginatedResponse,
     ErrorResponse,
     OffsetPagination,
+    OffsetPaginatedResponse,
     PaginatedResponse,
-    Pagination,
+    PaginationType,
     Response,
     ResponseStatus,
 )
@@ -199,19 +201,87 @@ class TestOffsetPagination:
         assert data["page"] == 2
         assert data["has_more"] is True
 
-    def test_pagination_alias_is_offset_pagination(self):
+    def test_total_count_can_be_none(self):
-        """Pagination is a backward-compatible alias for OffsetPagination."""
+        """total_count accepts None (include_total=False mode)."""
-        assert Pagination is OffsetPagination
+        pagination = OffsetPagination(
+            total_count=None,
+            items_per_page=20,
+            page=1,
+            has_more=True,
+        )
+        assert pagination.total_count is None
 
-    def test_pagination_alias_constructs_offset_pagination(self):
+    def test_serialization_with_none_total_count(self):
-        """Code using Pagination(...) still works unchanged."""
+        """OffsetPagination serializes total_count=None correctly."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
-            total_count=10,
+            total_count=None,
-            items_per_page=5,
+            items_per_page=20,
-            page=2,
+            page=1,
             has_more=False,
         )
-        assert isinstance(pagination, OffsetPagination)
+        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:
@@ -276,7 +346,7 @@ class TestPaginatedResponse:
 
     def test_create_paginated_response(self):
         """Create PaginatedResponse with data and pagination."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=30,
             items_per_page=10,
             page=1,
@@ -294,7 +364,7 @@ class TestPaginatedResponse:
 
     def test_with_custom_message(self):
         """PaginatedResponse with custom message."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=5,
             items_per_page=10,
             page=1,
@@ -310,13 +380,13 @@ class TestPaginatedResponse:
 
     def test_empty_data(self):
         """PaginatedResponse with empty data."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=0,
             items_per_page=10,
             page=1,
             has_more=False,
         )
-        response = PaginatedResponse[dict](
+        response = PaginatedResponse(
             data=[],
             pagination=pagination,
         )
@@ -325,14 +395,33 @@ class TestPaginatedResponse:
         assert response.data == []
         assert response.pagination.total_count == 0
 
+    def test_class_getitem_with_concrete_type_returns_discriminated_union(self):
+        """PaginatedResponse[T] with a concrete type returns a discriminated Annotated union."""
+        import typing
+
+        alias = PaginatedResponse[dict]
+        args = typing.get_args(alias)
+        # args[0] is the Union, args[1] is the FieldInfo discriminator
+        union_args = typing.get_args(args[0])
+        assert CursorPaginatedResponse[dict] in union_args
+        assert OffsetPaginatedResponse[dict] in union_args
+
+    def test_class_getitem_is_cached(self):
+        """Repeated subscripting with the same type returns the identical cached object."""
+        assert PaginatedResponse[dict] is PaginatedResponse[dict]
+
+    def test_class_getitem_with_typevar_returns_generic(self):
+        """PaginatedResponse[TypeVar] falls through to Pydantic generic parametrisation."""
+        from typing import TypeVar
+
+        T = TypeVar("T")
+        alias = PaginatedResponse[T]
+        # Should be a generic alias, not an Annotated union
+        assert not hasattr(alias, "__metadata__")
+
     def test_generic_type_hint(self):
         """PaginatedResponse supports generic type hints."""
-
+        pagination = OffsetPagination(
-        class UserOut:
-            id: int
-            name: str
-
-        pagination = Pagination(
             total_count=1,
             items_per_page=10,
             page=1,
@@ -347,7 +436,7 @@ class TestPaginatedResponse:
 
     def test_serialization(self):
         """PaginatedResponse serializes correctly."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=100,
             items_per_page=10,
             page=5,
@@ -385,15 +474,190 @@ class TestPaginatedResponse:
         )
         assert isinstance(response.pagination, CursorPagination)
 
-    def test_pagination_alias_accepted(self):
+
-        """Constructing PaginatedResponse with Pagination (alias) still works."""
+class TestPaginationType:
-        response = PaginatedResponse(
+    """Tests for PaginationType enum."""
+
+    def test_offset_value(self):
+        """OFFSET has string value 'offset'."""
+        assert PaginationType.OFFSET == "offset"
+        assert PaginationType.OFFSET.value == "offset"
+
+    def test_cursor_value(self):
+        """CURSOR has string value 'cursor'."""
+        assert PaginationType.CURSOR == "cursor"
+        assert PaginationType.CURSOR.value == "cursor"
+
+    def test_is_string_enum(self):
+        """PaginationType is a string enum."""
+        assert isinstance(PaginationType.OFFSET, str)
+        assert isinstance(PaginationType.CURSOR, str)
+
+    def test_members(self):
+        """PaginationType has exactly two members."""
+        assert set(PaginationType) == {PaginationType.OFFSET, PaginationType.CURSOR}
+
+
+class TestOffsetPaginatedResponse:
+    """Tests for OffsetPaginatedResponse schema."""
+
+    def test_pagination_type_is_offset(self):
+        """pagination_type is always PaginationType.OFFSET."""
+        response = OffsetPaginatedResponse(
             data=[],
-            pagination=Pagination(
+            pagination=OffsetPagination(
                 total_count=0, items_per_page=10, page=1, has_more=False
             ),
         )
+        assert response.pagination_type is PaginationType.OFFSET
+
+    def test_pagination_type_serializes_to_string(self):
+        """pagination_type serializes to 'offset' in JSON mode."""
+        response = OffsetPaginatedResponse(
+            data=[],
+            pagination=OffsetPagination(
+                total_count=0, items_per_page=10, page=1, has_more=False
+            ),
+        )
+        assert response.model_dump(mode="json")["pagination_type"] == "offset"
+
+    def test_pagination_field_is_typed(self):
+        """pagination field is OffsetPagination, not the union."""
+        response = OffsetPaginatedResponse(
+            data=[{"id": 1}],
+            pagination=OffsetPagination(
+                total_count=10, items_per_page=5, page=2, has_more=True
+            ),
+        )
         assert isinstance(response.pagination, OffsetPagination)
+        assert response.pagination.total_count == 10
+        assert response.pagination.page == 2
+
+    def test_is_subclass_of_paginated_response(self):
+        """OffsetPaginatedResponse IS a PaginatedResponse."""
+        response = OffsetPaginatedResponse(
+            data=[],
+            pagination=OffsetPagination(
+                total_count=0, items_per_page=10, page=1, has_more=False
+            ),
+        )
+        assert isinstance(response, PaginatedResponse)
+
+    def test_pagination_type_default_cannot_be_overridden_to_cursor(self):
+        """pagination_type rejects values other than OFFSET."""
+        with pytest.raises(ValidationError):
+            OffsetPaginatedResponse(
+                data=[],
+                pagination=OffsetPagination(
+                    total_count=0, items_per_page=10, page=1, has_more=False
+                ),
+                pagination_type=PaginationType.CURSOR,  # type: ignore[arg-type]  # ty:ignore[invalid-argument-type]
+            )
+
+    def test_filter_attributes_defaults_to_none(self):
+        """filter_attributes defaults to None."""
+        response = OffsetPaginatedResponse(
+            data=[],
+            pagination=OffsetPagination(
+                total_count=0, items_per_page=10, page=1, has_more=False
+            ),
+        )
+        assert response.filter_attributes is None
+
+    def test_full_serialization(self):
+        """Full JSON serialization includes all expected fields."""
+        response = OffsetPaginatedResponse(
+            data=[{"id": 1}],
+            pagination=OffsetPagination(
+                total_count=1, items_per_page=10, page=1, has_more=False
+            ),
+            filter_attributes={"status": ["active"]},
+        )
+        data = response.model_dump(mode="json")
+
+        assert data["pagination_type"] == "offset"
+        assert data["status"] == "SUCCESS"
+        assert data["data"] == [{"id": 1}]
+        assert data["pagination"]["total_count"] == 1
+        assert data["filter_attributes"] == {"status": ["active"]}
+
+
+class TestCursorPaginatedResponse:
+    """Tests for CursorPaginatedResponse schema."""
+
+    def test_pagination_type_is_cursor(self):
+        """pagination_type is always PaginationType.CURSOR."""
+        response = CursorPaginatedResponse(
+            data=[],
+            pagination=CursorPagination(
+                next_cursor=None, items_per_page=10, has_more=False
+            ),
+        )
+        assert response.pagination_type is PaginationType.CURSOR
+
+    def test_pagination_type_serializes_to_string(self):
+        """pagination_type serializes to 'cursor' in JSON mode."""
+        response = CursorPaginatedResponse(
+            data=[],
+            pagination=CursorPagination(
+                next_cursor=None, items_per_page=10, has_more=False
+            ),
+        )
+        assert response.model_dump(mode="json")["pagination_type"] == "cursor"
+
+    def test_pagination_field_is_typed(self):
+        """pagination field is CursorPagination, not the union."""
+        response = CursorPaginatedResponse(
+            data=[{"id": 1}],
+            pagination=CursorPagination(
+                next_cursor="abc123",
+                prev_cursor=None,
+                items_per_page=20,
+                has_more=True,
+            ),
+        )
+        assert isinstance(response.pagination, CursorPagination)
+        assert response.pagination.next_cursor == "abc123"
+        assert response.pagination.has_more is True
+
+    def test_is_subclass_of_paginated_response(self):
+        """CursorPaginatedResponse IS a PaginatedResponse."""
+        response = CursorPaginatedResponse(
+            data=[],
+            pagination=CursorPagination(
+                next_cursor=None, items_per_page=10, has_more=False
+            ),
+        )
+        assert isinstance(response, PaginatedResponse)
+
+    def test_pagination_type_default_cannot_be_overridden_to_offset(self):
+        """pagination_type rejects values other than CURSOR."""
+        with pytest.raises(ValidationError):
+            CursorPaginatedResponse(
+                data=[],
+                pagination=CursorPagination(
+                    next_cursor=None, items_per_page=10, has_more=False
+                ),
+                pagination_type=PaginationType.OFFSET,  # type: ignore[arg-type]  # ty:ignore[invalid-argument-type]
+            )
+
+    def test_full_serialization(self):
+        """Full JSON serialization includes all expected fields."""
+        response = CursorPaginatedResponse(
+            data=[{"id": 1}],
+            pagination=CursorPagination(
+                next_cursor="tok_next",
+                prev_cursor="tok_prev",
+                items_per_page=10,
+                has_more=True,
+            ),
+        )
+        data = response.model_dump(mode="json")
+
+        assert data["pagination_type"] == "cursor"
+        assert data["status"] == "SUCCESS"
+        assert data["pagination"]["next_cursor"] == "tok_next"
+        assert data["pagination"]["prev_cursor"] == "tok_prev"
 
 
 class TestFromAttributes:

uv.lock

@@ -113,101 +113,101 @@ wheels = [
 
 [[package]]
 name = "coverage"
-version = "7.13.4"
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zensical.toml

@@ -77,6 +77,10 @@ md_in_html = {}
 "pymdownx.tasklist" = {custom_checkbox = true}
 "pymdownx.tilde" = {}
 
+[project.markdown_extensions.pymdownx.emoji]
+emoji_index = "zensical.extensions.emoji.twemoji"
+emoji_generator = "zensical.extensions.emoji.to_svg"
+
 [project.markdown_extensions."pymdownx.highlight"]
 anchor_linenums = true
 line_spans = "__span"
@@ -95,3 +99,49 @@ permalink = true
 [project.markdown_extensions."pymdownx.snippets"]
 base_path = ["."]
 check_paths = true
+
+[[project.nav]]
+Home = "index.md"
+
+[[project.nav]]
+Modules = [
+    {CLI = "module/cli.md"},
+    {CRUD = "module/crud.md"},
+    {Database = "module/db.md"},
+    {Dependencies = "module/dependencies.md"},
+    {Exceptions = "module/exceptions.md"},
+    {Fixtures = "module/fixtures.md"},
+    {Logger = "module/logger.md"},
+    {Metrics = "module/metrics.md"},
+    {Models = "module/models.md"},
+    {Pytest = "module/pytest.md"},
+    {Schemas = "module/schemas.md"},
+]
+
+[[project.nav]]
+Reference = [
+    {CLI = "reference/cli.md"},
+    {CRUD = "reference/crud.md"},
+    {Database = "reference/db.md"},
+    {Dependencies = "reference/dependencies.md"},
+    {Exceptions = "reference/exceptions.md"},
+    {Fixtures = "reference/fixtures.md"},
+    {Logger = "reference/logger.md"},
+    {Metrics = "reference/metrics.md"},
+    {Models = "reference/models.md"},
+    {Pytest = "reference/pytest.md"},
+    {Schemas = "reference/schemas.md"},
+]
+
+[[project.nav]]
+Examples = [
+    {"Pagination & Search" = "examples/pagination-search.md"},
+]
+
+[[project.nav]]
+Migration = [
+    {"v2.0" = "migration/v2.md"},
+]
+
+[[project.nav]]
+"Changelog ↗" = "https://github.com/d3vyce/fastapi-toolsets/releases"