feat: AI套图分层方案 + Gemini集成 - 4种图案类型处理 + 正片叠底 + 宽高比 + 模型选择

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

Server/app/db.py

@@ -8,7 +8,15 @@ SQLALCHEMY_DATABASE_URL = getattr(settings, "DATABASE_URL", "sqlite:///./designe
 # 创建数据库引擎
 engine = create_engine(
     SQLALCHEMY_DATABASE_URL,
-    connect_args={"check_same_thread": False} if SQLALCHEMY_DATABASE_URL.startswith("sqlite") else {}
+    pool_pre_ping=True,  # 每次连接前 ping 一下，防止连接断开
+    pool_recycle=3600,   # 1小时回收连接
+    pool_size=10,        # 连接池大小
+    max_overflow=20,     # 最大溢出连接数
+    connect_args={
+        "connect_timeout": 60,  # 增加连接超时
+        "read_timeout": 60,     # 增加读取超时
+        "write_timeout": 60     # 增加写入超时
+    } if not SQLALCHEMY_DATABASE_URL.startswith("sqlite") else {"check_same_thread": False}
 )
 
 # 会话工厂与 ORM 基类
@@ -29,6 +37,8 @@ def init_db():
     from app.models.group import PluginGroup
     from app.models.session import UserSession
     from app.models.business import FeatureConfig, VipConfig, CheckInConfig, CheckInRecord, PointsHistory
+    from app.models.logs import PltProcessRecord, UserActionLog, PltPiece
+    from app.models.chat import ChatSession, ChatMessage
     Base.metadata.create_all(bind=engine)
     ensure_migrations()
     seed_data()