v1.2 scaffold

backend/app/db/__init__.py

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+

backend/app/db/session.py

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+from sqlalchemy import create_engine
+from sqlalchemy.orm import DeclarativeBase, sessionmaker
+
+from app.core.config import settings
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+connect_args = {"check_same_thread": False} if settings.database_url.startswith("sqlite") else {}
+
+engine = create_engine(settings.database_url, connect_args=connect_args)
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, expire_on_commit=False)
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+