refactor(backend): adopt typed SQLAlchemy models

apps/backend/models/check_in_record.py

@@ -1,35 +1,38 @@
-from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Index
-from sqlalchemy.orm import relationship
 from datetime import datetime, timezone
+from typing import TYPE_CHECKING
+
+from sqlalchemy import DateTime, ForeignKey, Index, String, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
 from backend.models.database import Base
 
+if TYPE_CHECKING:
+    from backend.models.check_in_task import CheckInTask
+
 
 class CheckInRecord(Base):
     """打卡记录模型"""
 
     __tablename__ = "check_in_records"
 
-    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
-    task_id = Column(
-        Integer,
+    id: Mapped[int] = mapped_column(primary_key=True, index=True, autoincrement=True)
+    task_id: Mapped[int] = mapped_column(
         ForeignKey("check_in_tasks.id", ondelete="CASCADE"),
-        nullable=False,
         index=True,
         comment="任务 ID",
     )
-    status = Column(
+    status: Mapped[str] = mapped_column(
         String(20),
-        nullable=False,
         index=True,
         comment="状态: success/failure/out_of_time/unknown/pending",
     )
-    response_text = Column(Text, default="", comment="响应文本")
-    error_message = Column(Text, default="", comment="错误信息")
-    location = Column(Text, default="{}", comment="位置信息 JSON")
-    trigger_type = Column(
+    response_text: Mapped[str] = mapped_column(Text, default="", comment="响应文本")
+    error_message: Mapped[str] = mapped_column(Text, default="", comment="错误信息")
+    location: Mapped[str] = mapped_column(Text, default="{}", comment="位置信息 JSON")
+    trigger_type: Mapped[str] = mapped_column(
         String(50), default="scheduled", comment="触发类型: scheduled/manual/admin"
     )
-    check_in_time = Column(
+    check_in_time: Mapped[datetime] = mapped_column(
         DateTime(timezone=True),
         default=lambda: datetime.now(timezone.utc),
         index=True,
@@ -37,7 +40,7 @@ class CheckInRecord(Base):
     )
 
     # 关联任务
-    task = relationship("CheckInTask", back_populates="check_in_records")
+    task: Mapped["CheckInTask"] = relationship(back_populates="check_in_records")
 
     # 添加复合索引：加速常见查询
     __table_args__ = (

apps/backend/models/check_in_task.py

@@ -1,45 +1,57 @@
-from sqlalchemy import Column, Integer, String, Boolean, Text, DateTime, ForeignKey, Index
-from sqlalchemy.orm import relationship
+from datetime import datetime
+from typing import TYPE_CHECKING
+
+from sqlalchemy import Boolean, DateTime, ForeignKey, Index, String, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
 from sqlalchemy.sql import func
+
 from backend.models.database import Base
 
+if TYPE_CHECKING:
+    from backend.models.check_in_record import CheckInRecord
+    from backend.models.user import User
+
 
 class CheckInTask(Base):
     """打卡任务模型"""
 
     __tablename__ = "check_in_tasks"
 
-    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
-    user_id = Column(
-        Integer,
+    id: Mapped[int] = mapped_column(primary_key=True, index=True, autoincrement=True)
+    user_id: Mapped[int] = mapped_column(
         ForeignKey("users.id", ondelete="CASCADE"),
-        nullable=False,
         index=True,
         comment="用户 ID",
     )
-    payload_config = Column(
+    payload_config: Mapped[str] = mapped_column(
         Text,
         default="{}",
         nullable=False,
         comment="完整的 payload 配置 JSON（从模板生成，包含 ThreadId 和所有字段）",
     )
-    name = Column(String(100), default="", comment="任务名称（用户自定义）")
-    is_active = Column(Boolean, default=True, comment="是否启用自动打卡（不影响手动打卡）")
-    cron_expression = Column(
+    name: Mapped[str] = mapped_column(String(100), default="", comment="任务名称（用户自定义）")
+    is_active: Mapped[bool] = mapped_column(
+        Boolean, default=True, comment="是否启用自动打卡（不影响手动打卡）"
+    )
+    cron_expression: Mapped[str | None] = mapped_column(
         String(100),
         default="0 20 * * *",
         nullable=True,
         comment="Crontab 表达式（NULL 表示禁用自动打卡，否则按表达式执行）",
     )
-    created_at = Column(DateTime(timezone=True), server_default=func.now(), comment="创建时间")
-    updated_at = Column(DateTime(timezone=True), onupdate=func.now(), comment="更新时间")
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), comment="创建时间"
+    )
+    updated_at: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), onupdate=func.now(), comment="更新时间"
+    )
 
     # 关联用户
-    user = relationship("User", back_populates="tasks")
+    user: Mapped["User"] = relationship(back_populates="tasks")
 
     # 关联打卡记录
-    check_in_records = relationship(
-        "CheckInRecord", back_populates="task", cascade="all, delete-orphan"
+    check_in_records: Mapped[list["CheckInRecord"]] = relationship(
+        back_populates="task", cascade="all, delete-orphan"
     )
 
     # 添加索引：加速查询

apps/backend/models/database.py

@@ -1,7 +1,8 @@
-from sqlalchemy import create_engine, event
-from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import sessionmaker
 from datetime import datetime, timezone
+
+from sqlalchemy import create_engine, event
+from sqlalchemy.orm import DeclarativeBase, sessionmaker
+
 from backend.config import settings
 
 # 创建数据库引擎
@@ -14,8 +15,9 @@ engine = create_engine(
 # 创建会话工厂
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 
-# 创建基类
-Base = declarative_base()
+
+class Base(DeclarativeBase):
+    pass
 
 
 # SQLite timezone 修复：在加载对象后，将所有 naive datetime 转换为 UTC timezone-aware

apps/backend/models/task_template.py

@@ -1,6 +1,11 @@
-from sqlalchemy import Column, Integer, String, Boolean, Text, DateTime, ForeignKey
-from sqlalchemy.orm import relationship
+from __future__ import annotations
+
+from datetime import datetime
+
+from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
 from sqlalchemy.sql import func
+
 from backend.models.database import Base
 
 
@@ -9,27 +14,33 @@ class TaskTemplate(Base):
 
     __tablename__ = "task_templates"
 
-    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
-    name = Column(String(100), nullable=False, comment="模板名称")
-    description = Column(Text, nullable=True, comment="模板描述")
+    id: Mapped[int] = mapped_column(primary_key=True, index=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(String(100), nullable=False, comment="模板名称")
+    description: Mapped[str | None] = mapped_column(Text, nullable=True, comment="模板描述")
 
     # 父模板 ID（用于继承）
-    parent_id = Column(
-        Integer,
+    parent_id: Mapped[int | None] = mapped_column(
         ForeignKey("task_templates.id", ondelete="SET NULL"),
         nullable=True,
         comment="父模板 ID",
     )
 
     # 字段配置（JSON 格式）
-    field_config = Column(Text, nullable=False, comment="字段配置（JSON）")
+    field_config: Mapped[str] = mapped_column(Text, nullable=False, comment="字段配置（JSON）")
 
-    is_active = Column(Boolean, default=True, comment="是否启用")
-    created_at = Column(DateTime(timezone=True), server_default=func.now(), comment="创建时间")
-    updated_at = Column(DateTime(timezone=True), onupdate=func.now(), comment="更新时间")
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True, comment="是否启用")
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), comment="创建时间"
+    )
+    updated_at: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), onupdate=func.now(), comment="更新时间"
+    )
 
     # 自引用关系：父模板和子模板
-    parent = relationship("TaskTemplate", remote_side=[id], backref="children")
+    parent: Mapped[TaskTemplate | None] = relationship(
+        remote_side="TaskTemplate.id", back_populates="children"
+    )
+    children: Mapped[list[TaskTemplate]] = relationship(back_populates="parent")
 
     def __repr__(self):
         return f"<TaskTemplate(id={self.id}, name='{self.name}', is_active={self.is_active})>"

apps/backend/models/user.py

@@ -1,56 +1,83 @@
-from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean, Index
-from sqlalchemy.orm import relationship
+from datetime import datetime
+from typing import TYPE_CHECKING
+
+from sqlalchemy import Boolean, DateTime, Index, String, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
 from sqlalchemy.sql import func
+
 from backend.models.database import Base
 
+if TYPE_CHECKING:
+    from backend.models.check_in_task import CheckInTask
+
 
 class User(Base):
     """用户模型 - 账户信息"""
 
     __tablename__ = "users"
 
-    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
-    jwt_sub = Column(
+    id: Mapped[int] = mapped_column(primary_key=True, index=True, autoincrement=True)
+    jwt_sub: Mapped[str | None] = mapped_column(
         String(200),
         unique=True,
         nullable=True,
         index=True,
         comment="QQ 扫码登录的唯一用户标识（注册时为空）",
     )
-    alias = Column(
+    alias: Mapped[str] = mapped_column(
         String(50), unique=True, nullable=False, index=True, comment="用户别名（用于登录）"
     )
-    email = Column(String(100), nullable=True, comment="用户邮箱（用于接收通知）")
-    password_hash = Column(String(200), nullable=True, comment="密码哈希（bcrypt加密）")
-    authorization = Column(Text, nullable=True, comment="当前有效的 QQ Token")
-    jwt_exp = Column(String(20), default="0", comment="Token 过期时间戳")
-    token_expiring_notified = Column(
+    email: Mapped[str | None] = mapped_column(
+        String(100), nullable=True, comment="用户邮箱（用于接收通知）"
+    )
+    password_hash: Mapped[str | None] = mapped_column(
+        String(200), nullable=True, comment="密码哈希（bcrypt加密）"
+    )
+    authorization: Mapped[str | None] = mapped_column(
+        Text, nullable=True, comment="当前有效的 QQ Token"
+    )
+    jwt_exp: Mapped[str] = mapped_column(String(20), default="0", comment="Token 过期时间戳")
+    token_expiring_notified: Mapped[bool] = mapped_column(
         Boolean,
         default=False,
         nullable=False,
         comment="Token 即将过期提醒是否已发送（过期前30分钟）",
     )
-    token_expired_notified = Column(
+    token_expired_notified: Mapped[bool] = mapped_column(
         Boolean,
         default=False,
         nullable=False,
         comment="Token 已过期提醒是否已发送（过期后30分钟内）",
     )
-    role = Column(String(20), default="user", index=True, comment="角色: user/admin")
-    is_approved = Column(Boolean, default=False, index=True, comment="是否已通过管理员审批")
+    role: Mapped[str] = mapped_column(
+        String(20), default="user", index=True, comment="角色: user/admin"
+    )
+    is_approved: Mapped[bool] = mapped_column(
+        Boolean, default=False, index=True, comment="是否已通过管理员审批"
+    )
 
     # 账户锁定相关字段
-    failed_login_attempts = Column(Integer, default=0, nullable=False, comment="连续登录失败次数")
-    locked_until = Column(DateTime(timezone=True), nullable=True, comment="账户锁定到期时间")
-    last_failed_login = Column(
+    failed_login_attempts: Mapped[int] = mapped_column(
+        default=0, nullable=False, comment="连续登录失败次数"
+    )
+    locked_until: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), nullable=True, comment="账户锁定到期时间"
+    )
+    last_failed_login: Mapped[datetime | None] = mapped_column(
         DateTime(timezone=True), nullable=True, comment="最后一次登录失败时间"
     )
 
-    created_at = Column(DateTime(timezone=True), server_default=func.now(), comment="创建时间")
-    updated_at = Column(DateTime(timezone=True), onupdate=func.now(), comment="更新时间")
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), comment="创建时间"
+    )
+    updated_at: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), onupdate=func.now(), comment="更新时间"
+    )
 
     # 关联打卡任务
-    tasks = relationship("CheckInTask", back_populates="user", cascade="all, delete-orphan")
+    tasks: Mapped[list["CheckInTask"]] = relationship(
+        back_populates="user", cascade="all, delete-orphan"
+    )
 
     # 添加复合索引：加速审批管理查询
     __table_args__ = (