fix: sql query

Author: fiftin

db/sql/task.go

@@ -12,7 +12,7 @@ func (d *SqlDb) CreateTaskStage(stage db.TaskStage) (res db.TaskStage, err error
 	insertID, err := d.insert(
 		"id",
 		"insert into task__stage "+
-			"(task_id, start, end, start_output_id, end_output_id, type) VALUES "+
+			"(task_id, `start`, `end`, start_output_id, end_output_id, type) VALUES "+
 			"(?, ?, ?, ?, ?, ?)",
 		stage.TaskID,
 		stage.Start,