first commit

app/database.py

@@ -0,0 +1,33 @@
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import declarative_base
+
+from app.config import settings
+
+_url = settings.database_url
+# SQLite for local dev — no pool settings
+if _url.startswith("sqlite"):
+    engine = create_async_engine(_url, echo=False, connect_args={"check_same_thread": False})
+else:
+    engine = create_async_engine(_url, echo=False, pool_pre_ping=True, pool_size=10, max_overflow=20)
+
+AsyncSessionLocal = async_sessionmaker(
+    bind=engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+    autocommit=False,
+    autoflush=False,
+)
+
+Base = declarative_base()
+
+
+async def get_db():
+    async with AsyncSessionLocal() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()