init

backend/app/database.py

@@ -0,0 +1,26 @@
+from typing import AsyncGenerator
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy import text
+
+from app.config import settings
+
+engine = create_async_engine(settings.database_url, echo=False, connect_args={"check_same_thread": False})
+async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+async def init_db():
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+        # 启用 WAL 模式，提升并发读写性能
+        await conn.execute(text("PRAGMA journal_mode=WAL"))
+        await conn.execute(text("PRAGMA busy_timeout=5000"))
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with async_session() as session:
+        yield session