restructure

app/database.py

@@ -0,0 +1,25 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, DeclarativeBase
+from sqlalchemy.types import PickleType
+
+import os
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///" + os.environ.get("DATABASE_URL", "/data/db.sqlite")
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+async def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+class Base(DeclarativeBase):
+    type_annotation_map = {
+        dict[str, bool]: PickleType
+    }