first commit

db.py

@@ -0,0 +1,13 @@
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
+from sqlalchemy.orm import sessionmaker, declarative_base
+
+DATABASE_URL = "postgresql+asyncpg://weather_user:weather_pass@localhost:5432/weather"
+
+engine = create_async_engine(DATABASE_URL, echo=False)
+AsyncSessionLocal = sessionmaker(bind=engine, class_=AsyncSession, expire_on_commit=False)
+
+Base = declarative_base()
+
+async def get_session():
+    async with AsyncSessionLocal() as session:
+        yield session