refactor: replace issues backend with milestone tasks

app/api/routers/projects.py

@@ -231,14 +231,14 @@ def delete_project(
     
     project_code = project.project_code
     
-    # Delete milestones and their issues
+    # Delete milestones and their tasks
     from app.models.milestone import Milestone
+    from app.models.task import Task
     milestones = db.query(Milestone).filter(Milestone.project_id == project_id).all()
     for ms in milestones:
-        # Delete issues under milestone
-        issues = db.query(models.Issue).filter(models.Issue.milestone_id == ms.id).all()
-        for issue in issues:
-            db.delete(issue)
+        tasks = db.query(Task).filter(Task.milestone_id == ms.id).all()
+        for task in tasks:
+            db.delete(task)
         db.delete(ms)
     
     # Delete project members
@@ -363,13 +363,14 @@ from sqlalchemy import func as sqlfunc
 
 @router.get("/{project_id}/worklogs/summary")
 def project_worklog_summary(project_id: int, db: Session = Depends(get_db)):
+    from app.models.task import Task as TaskModel
     results = db.query(
         models.User.id, models.User.username,
         sqlfunc.sum(WorkLog.hours).label("total_hours"),
         sqlfunc.count(WorkLog.id).label("log_count")
     ).join(WorkLog, WorkLog.user_id == models.User.id)\
-     .join(models.Issue, WorkLog.issue_id == models.Issue.id)\
-     .filter(models.Issue.project_id == project_id)\
+     .join(TaskModel, WorkLog.task_id == TaskModel.id)\
+     .filter(TaskModel.project_id == project_id)\
      .group_by(models.User.id, models.User.username).all()
     total = sum(r.total_hours for r in results)
     by_user = [{"user_id": r.id, "username": r.username, "hours": round(r.total_hours, 2), "logs": r.log_count} for r in results]