立项配置页初步优化

backend/app/models/site.py

@@ -1,7 +1,7 @@
 import uuid
-from datetime import datetime
+from datetime import date, datetime
 
-from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, func
+from sqlalchemy import Boolean, Date, DateTime, ForeignKey, Integer, String, Text, func
 from sqlalchemy.dialects.postgresql import UUID
 from sqlalchemy.orm import Mapped, mapped_column
 
@@ -19,5 +19,7 @@ class Site(Base):
     contact: Mapped[str | None] = mapped_column(String(100), nullable=True)
     is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, server_default="true")
     enrollment_target: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    enrollment_plan_start_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    enrollment_plan_end_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    enrollment_plan_note: Mapped[str | None] = mapped_column(Text, nullable=True)
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
-