Rescue Paperjet v1 implementation

backend/app/db.py

@@ -4,11 +4,10 @@ Database engine, session management, and WAL mode setup.
 SQLite with WAL mode for single-user concurrent read/write safety.
 """
 
-from collections.abc import AsyncGenerator
-from contextlib import asynccontextmanager
+from collections.abc import Generator
 from typing import Any
 
-from sqlalchemy import event, create_engine, Engine
+from sqlalchemy import Engine, create_engine, event
 from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
 
 from app.config import settings
@@ -16,6 +15,7 @@ from app.config import settings
 
 class Base(DeclarativeBase):
     """SQLAlchemy declarative base for all models."""
+
     pass
 
 
@@ -49,10 +49,10 @@ engine = create_db_engine()
 SessionLocal = sessionmaker(bind=engine, class_=Session, expire_on_commit=False)
 
 
-def get_db() -> Session:
+def get_db() -> Generator[Session, None, None]:
     """FastAPI dependency that yields a database session."""
     db = SessionLocal()
     try:
-        yield db  # type: ignore[misc]
+        yield db
     finally:
         db.close()