fix: 修复聊天排队和每日额度重置

ai_knowledge_base_v2/apps/backend/app/models/user.py

@@ -1,8 +1,8 @@
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import date, datetime
 
-from sqlalchemy import BigInteger, DateTime, Integer, String
+from sqlalchemy import BigInteger, Date, DateTime, Integer, String
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.models.base import Base, SoftDeleteMixin, TimestampMixin
@@ -18,6 +18,7 @@ class User(Base, TimestampMixin, SoftDeleteMixin):
     status: Mapped[int] = mapped_column(default=1, nullable=False)
     daily_chat_limit: Mapped[int] = mapped_column(Integer, default=100, nullable=False)
     daily_chat_used: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
+    daily_chat_reset_date: Mapped[date | None] = mapped_column(Date, nullable=True)
     effective_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
     expired_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
     last_login_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)