feat: enhance agent orchestration, knowledge flow and UI refinements

backend/app/routers/task.py

@@ -1,6 +1,8 @@
-from fastapi import APIRouter, Depends, HTTPException
+from datetime import UTC, date, datetime
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy import desc, select
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy import select, desc
 from app.database import get_db
 from app.models.task import Task, TaskStatus
 from app.models.user import User
@@ -13,12 +15,28 @@ router = APIRouter(prefix="/api/tasks", tags=["看板"])
 @router.get("", response_model=list[TaskOut])
 async def list_tasks(
     status: TaskStatus | None = None,
+    due_date: date | None = Query(default=None),
+    date_from: date | None = Query(default=None),
+    date_to: date | None = Query(default=None),
     current_user: User = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ):
     query = select(Task).where(Task.user_id == current_user.id)
     if status:
         query = query.where(Task.status == status)
+    if due_date:
+        start = datetime.combine(due_date, datetime.min.time())
+        end = datetime.combine(due_date, datetime.max.time())
+        query = query.where(Task.due_date.is_not(None), Task.due_date >= start, Task.due_date <= end)
+    else:
+        start = datetime.combine(date_from, datetime.min.time()) if date_from else None
+        end = datetime.combine(date_to, datetime.max.time()) if date_to else None
+        if start and end and start > end:
+            raise HTTPException(status_code=400, detail="开始日期不能晚于结束日期")
+        if start is not None:
+            query = query.where(Task.due_date.is_not(None), Task.due_date >= start)
+        if end is not None:
+            query = query.where(Task.due_date.is_not(None), Task.due_date <= end)
     query = query.order_by(desc(Task.created_at))
     result = await db.execute(query)
     return result.scalars().all()
@@ -64,10 +82,10 @@ async def update_task(
         if field == "tags":
             setattr(task, field, json.dumps(value))
         elif field == "status" and value == TaskStatus.DONE:
-            from datetime import UTC, datetime
             task.completed_at = datetime.now(UTC)
             setattr(task, field, value)
-        else:
+        elif field == "status":
+            task.completed_at = None
             setattr(task, field, value)
 
     await db.commit()