"""FastAPI dependencies."""

from __future__ import annotations

from typing import TYPE_CHECKING, Annotated

from fastapi import Depends, Request
from sqlalchemy.orm import Session

if TYPE_CHECKING:
    from collections.abc import Iterator


def get_db(request: Request) -> Iterator[Session]:
    """Get database session from app state."""
    with Session(request.app.state.engine) as session:
        yield session


DbSession = Annotated[Session, Depends(get_db)]