Strengthen test typing - remove all test-related mypy overrides and ruff ANN001 ignore

TODO.md

@@ -15,6 +15,10 @@ Items marked with :fire: are high priority.
 - Medium-term typing direction: replace runtime-injected reverse accessors
   with explicit reverse relationship declarations in model classes so
   reverse-side usage is mypy-friendly without casts or TYPE_CHECKING hacks.
+- Short-term typing upgrade for user code: improve library type hints for
+  dynamic ORM relationship APIs (reverse FK descriptors, M2M managers, and
+  prefetched relation result types) to reduce required casts in normal
+  application code and tests.
 - Registry lifetime: global registry can cause cross-talk when models are
   defined repeatedly in one process (e.g., tests). Current mitigation exists
   via `ModelRegistry.reset()` and snapshot/restore helpers; longer-term option:

pyproject.toml

@@ -137,7 +137,6 @@ convention = "google"
 [tool.ruff.lint.extend-per-file-ignores]
 "tests/**/*.py" = [
   "S101",    # we can (and MUST!) use 'assert' in test files.
-  "ANN001",  # annotations for fixtures are sometimes a pain for test files
   "ARG00",   # test fixtures often are not directly used
   "PLR2004", # magic numbers are often used in test files
   "SLF001",  # sometimes we need to test private methods
@@ -155,10 +154,6 @@ plugins = ["pydantic.mypy"]
 python_version = "3.9"
 exclude = ["docs"]
 
-[[tool.mypy.overrides]]
-disable_error_code = ["method-assign", "no-untyped-def", "attr-defined"]
-module = "tests.*"
-
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
 asyncio_default_fixture_loop_scope = "function"

tests/conftest.py

@@ -15,19 +15,20 @@
 
 if TYPE_CHECKING:
     from collections.abc import Generator
+    from pathlib import Path
 
 
 memory_db = ":memory:"
 
 
 @pytest.hookimpl(tryfirst=True)
-def pytest_configure(config) -> None:
+def pytest_configure(config: pytest.Config) -> None:
     """Clear the screen before running tests."""
     os.system("cls" if os.name == "nt" else "clear")  # noqa: S605
 
 
 @contextmanager
-def not_raises(exception) -> Generator[None, Any, None]:
+def not_raises(exception: type[BaseException]) -> Generator[None, Any, None]:
     """Fake a pytest.raises context manager that does not raise an exception.
 
     Use: `with not_raises(Exception):`
@@ -198,7 +199,7 @@ def db_mock_complex_debug() -> SqliterDB:
 
 
 @pytest.fixture
-def temp_db_path(tmp_path) -> str:
+def temp_db_path(tmp_path: Path) -> str:
     """Fixture to create a temporary database file path."""
     return str(tmp_path / "test_db.sqlite")