refactor: v2

backend & frontend

backend/models/database.py

@@ -0,0 +1,52 @@
+from sqlalchemy import create_engine, event
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from datetime import datetime, timezone
+from backend.config import settings
+
+# 创建数据库引擎
+engine = create_engine(
+    settings.DATABASE_URL,
+    connect_args={"check_same_thread": False},  # SQLite 特定配置
+    echo=False,  # 生产环境设为 False
+)
+
+# 创建会话工厂
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# 创建基类
+Base = declarative_base()
+
+
+# SQLite timezone 修复：在加载对象后，将所有 naive datetime 转换为 UTC timezone-aware
+@event.listens_for(Base, "load", propagate=True)
+def receive_load(target, context):
+    """在从数据库加载对象后，将所有 datetime 字段转换为 timezone-aware (UTC)"""
+    for attr_name in dir(target):
+        # 跳过私有属性和方法
+        if attr_name.startswith('_'):
+            continue
+
+        try:
+            attr_value = getattr(target, attr_name)
+
+            # 如果是 naive datetime，添加 UTC timezone
+            if isinstance(attr_value, datetime) and attr_value.tzinfo is None:
+                setattr(target, attr_name, attr_value.replace(tzinfo=timezone.utc))
+        except (AttributeError, TypeError):
+            # 某些属性可能无法访问或设置，跳过
+            continue
+
+
+def get_db():
+    """依赖注入：获取数据库会话"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db():
+    """初始化数据库：创建所有表"""
+    Base.metadata.create_all(bind=engine)