백엔드 전체 구현 완료: 내부 서비스(Auth, Client, Realtime), API 엔드포인트 및 스케줄러 구현

backend/app/db/database.py

@@ -0,0 +1,28 @@
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
+from sqlalchemy.orm import DeclarativeBase
+from app.core.config import settings
+
+# 1. Async Engine
+# "check_same_thread": False is required for SQLite
+engine = create_async_engine(
+    settings.DATABASE_URL, 
+    echo=False,
+    connect_args={"check_same_thread": False} if "sqlite" in settings.DATABASE_URL else {}
+)
+
+# 2. Async Session Factory
+SessionLocal = async_sessionmaker(
+    bind=engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+    autoflush=False
+)
+
+# 3. Base Model
+class Base(DeclarativeBase):
+    pass
+
+# 4. Dependency Injection for FastAPI
+async def get_db():
+    async with SessionLocal() as session:
+        yield session