feat: add Leave model with auto-migration

Co-Authored-By: Claude <noreply@anthropic.com>

backend/app/main.py

@@ -53,6 +53,26 @@ async def lifespan(app: FastAPI):
         await conn.run_sync(lambda c: c.exec_driver_sql(
             "CREATE TABLE IF NOT EXISTS system_config (key VARCHAR(64) PRIMARY KEY, value TEXT DEFAULT '')"
         ))
+        # leaves table for v0.7
+        await conn.run_sync(lambda c: c.exec_driver_sql(
+            "CREATE TABLE IF NOT EXISTS leaves ("
+            "  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),"
+            "  manager_id UUID NOT NULL REFERENCES users(id),"
+            "  leave_type VARCHAR(20) NOT NULL DEFAULT '事假',"
+            "  start_date DATE NOT NULL,"
+            "  end_date DATE NOT NULL,"
+            "  reason VARCHAR(500) DEFAULT '',"
+            "  submitted_by UUID NOT NULL REFERENCES users(id),"
+            "  created_at TIMESTAMPTZ DEFAULT now(),"
+            "  updated_at TIMESTAMPTZ DEFAULT now()"
+            ")"
+        ))
+        await conn.run_sync(lambda c: c.exec_driver_sql(
+            "CREATE INDEX IF NOT EXISTS idx_leaves_manager_id ON leaves(manager_id)"
+        ))
+        await conn.run_sync(lambda c: c.exec_driver_sql(
+            "CREATE INDEX IF NOT EXISTS idx_leaves_dates ON leaves(start_date, end_date)"
+        ))
 
     # Read notification_time from DB (or use default 17:30)
     notification_hour, notification_minute = 17, 30

backend/app/models/__init__.py

@@ -9,6 +9,7 @@ from app.models.key_visit import KeyVisit
 from app.models.daily_note import DailyNote
 from app.models.ai_summary import AISummary
 from app.models.system_config import SystemConfig
+from app.models.leave import Leave
 
 __all__ = [
     "User",
@@ -22,4 +23,5 @@ __all__ = [
     "DailyNote",
     "AISummary",
     "SystemConfig",
+    "Leave",
 ]

backend/app/models/leave.py

@@ -0,0 +1,30 @@
+import uuid
+from datetime import date, datetime
+from sqlalchemy import String, Date, DateTime, ForeignKey, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+from app.database import Base
+
+
+class Leave(Base):
+    __tablename__ = "leaves"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    manager_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("users.id"), index=True
+    )
+    leave_type: Mapped[str] = mapped_column(String(20), default="事假")
+    start_date: Mapped[date] = mapped_column(Date)
+    end_date: Mapped[date] = mapped_column(Date)
+    reason: Mapped[str] = mapped_column(String(500), default="")
+    submitted_by: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("users.id")
+    )
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now()
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )