refactor: 优化后端数据库与依赖

- 优化 api/database/database.py
- 更新 api/requirements.txt

Co-authored-by: Cursor <cursoragent@cursor.com>

api/database/database.py

@@ -1,6 +1,6 @@
 """
 数据库连接和初始化
-支持 PostgreSQL（推荐）和 SQLite（本地开发）
+仅支持 PostgreSQL
 """
 import os
 from sqlalchemy import create_engine
@@ -20,25 +20,14 @@ def parse_database_url(url: str) -> tuple[str, str]:
     支持格式：
     - PostgreSQL: postgresql://user:pass@host:port/db
     - PostgreSQL async: postgresql+asyncpg://user:pass@host:port/db
-    - SQLite: sqlite:///./path/to/db.db
-    - SQLite async: sqlite+aiosqlite:///./path/to/db.db
     """
-    # PostgreSQL
     if url.startswith("postgresql+asyncpg://"):
         async_url = url
         sync_url = url.replace("postgresql+asyncpg://", "postgresql://")
     elif url.startswith("postgresql://"):
         sync_url = url
         async_url = url.replace("postgresql://", "postgresql+asyncpg://")
-    # SQLite
-    elif url.startswith("sqlite+aiosqlite://"):
-        async_url = url
-        sync_url = url.replace("sqlite+aiosqlite://", "sqlite://")
-    elif url.startswith("sqlite://"):
-        sync_url = url
-        async_url = url.replace("sqlite://", "sqlite+aiosqlite://")
     else:
-        # 默认使用 PostgreSQL
         print(f"警告: DATABASE_URL 格式不正确 ({url})，使用默认 PostgreSQL")
         sync_url = "postgresql://postgres:postgres@localhost:5432/life_echo"
         async_url = "postgresql+asyncpg://postgres:postgres@localhost:5432/life_echo"
@@ -48,27 +37,19 @@ def parse_database_url(url: str) -> tuple[str, str]:
 
 DATABASE_URL, ASYNC_DATABASE_URL = parse_database_url(raw_database_url)
 
-# 创建同步引擎（用于迁移、Celery 任务等）
-# SQLite 需要特殊的 connect_args
-if DATABASE_URL.startswith("sqlite"):
-    engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
-else:
-    # 使用 psycopg (v3) 驱动
-    sync_url = DATABASE_URL.replace("postgresql://", "postgresql+psycopg://")
-    engine = create_engine(sync_url, pool_size=5, max_overflow=10)
+# 同步引擎（用于迁移、Celery 任务等），使用 psycopg
+sync_url = DATABASE_URL.replace("postgresql://", "postgresql+psycopg://")
+engine = create_engine(sync_url, pool_size=5, max_overflow=10)
 
-# 创建异步引擎（用于 FastAPI）
-if ASYNC_DATABASE_URL.startswith("sqlite"):
-    async_engine = create_async_engine(ASYNC_DATABASE_URL, echo=False)
-else:
-    async_engine = create_async_engine(
-        ASYNC_DATABASE_URL, 
-        echo=False,
-        pool_size=5,
-        max_overflow=10
-    )
+# 异步引擎（用于 FastAPI）
+async_engine = create_async_engine(
+    ASYNC_DATABASE_URL,
+    echo=False,
+    pool_size=5,
+    max_overflow=10,
+)
 
-# 创建会话工厂
+# 会话工厂
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 AsyncSessionLocal = async_sessionmaker(async_engine, class_=AsyncSession, expire_on_commit=False)
 
@@ -98,4 +79,3 @@ async def get_async_db():
             raise
         finally:
             await session.close()
-

api/requirements.txt

@@ -14,8 +14,6 @@ greenlet>=3.3.0
 # PostgreSQL drivers
 asyncpg>=0.29.0
 psycopg[binary]>=3.1.0
-# SQLite
-aiosqlite==0.20.0
 
 # Redis for session storage
 redis>=5.0.0