Bootstrap Python rewrite skeleton

app/db.py

@@ -0,0 +1,29 @@
+from collections.abc import Generator
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import DeclarativeBase, Session, sessionmaker
+
+from app.config import get_settings
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+settings = get_settings()
+
+connect_args: dict[str, object] = {}
+if settings.database_url.startswith("sqlite"):
+    connect_args["check_same_thread"] = False
+
+engine = create_engine(settings.database_url, connect_args=connect_args)
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, class_=Session)
+
+
+def get_db_session() -> Generator[Session, None, None]:
+    session = SessionLocal()
+    try:
+        yield session
+    finally:
+        session.close()
+