ORM update and lots of improvements

database/db.py

@@ -0,0 +1,12 @@
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.orm import declarative_base
+
+from config import DATABASE_URL
+
+engine = create_async_engine(DATABASE_URL, echo=False, future=True)
+
+async_session_maker = async_sessionmaker(
+    bind=engine, expire_on_commit=False, class_=AsyncSession
+)
+
+Base = declarative_base()