Deleting user now works, and forces you to allocate tasks from each user to another user before deleting them

backend/main.py

@@ -96,6 +96,19 @@ def delete_user(user_id: str, db: Session = Depends(get_db), current_user: model
     db_user = db.query(models.User).filter(models.User.id == user_id).first()
     if not db_user:
         raise HTTPException(status_code=404, detail="User not found")
+
+    # Check for OPEN assigned tasks (that are not in the trash)
+    open_tasks = db.query(models.Task).filter(
+        models.Task.assignee_id == user_id,
+        models.Task.status == "open",
+        models.Task.deleted_at == None
+    ).first()
+    if open_tasks:
+        raise HTTPException(status_code=400, detail="Cannot delete user: They still have OPEN tasks assigned to them. Reassign them first.")
+
+    # Nullify references in closed tasks and notes so we don't lose history
+    db.query(models.Task).filter(models.Task.assignee_id == user_id).update({"assignee_id": None})
+    db.query(models.TaskNote).filter(models.TaskNote.author_id == user_id).update({"author_id": None})
     
     db.delete(db_user)
     db.commit()