Initial commit: import from sinmb79/Gov-chat-bot

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/core/database.py

@@ -0,0 +1,28 @@
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy.orm import DeclarativeBase, sessionmaker
+
+# Phase 0B에서 settings로 교체 예정 — 현재는 하드코딩 허용
+DATABASE_URL = "sqlite+aiosqlite:///:memory:"
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+engine = create_async_engine(DATABASE_URL, echo=False)
+AsyncSessionLocal = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+
+async def get_db():
+    async with AsyncSessionLocal() as session:
+        yield session
+
+
+async def init_db():
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+
+async def startup_hook():
+    """Phase 0B startup 훅 — DB 초기화 + 추가 작업 예정."""
+    await init_db()