feat: add cron

apps/recorder/src/models/subscriptions/mod.rs

@@ -190,16 +190,16 @@ impl Model {
         let subscription_model = Entity::find_by_id(subscription_id)
             .one(db)
             .await?
-            .ok_or_else(|| RecorderError::ModelEntityNotFound {
-                entity: "Subscription".into(),
-            })?;
+            .ok_or_else(|| RecorderError::from_model_not_found("Subscription"))?;
 
         if subscription_model.subscriber_id != subscriber_id {
-            Err(RecorderError::ModelEntityNotFound {
-                entity: "Subscription".into(),
-            })?;
+            Err(RecorderError::from_model_not_found("Subscription"))?;
         }
 
         Ok(subscription_model)
     }
+
+    pub async fn exec_cron(&self, _ctx: &dyn AppContextTrait) -> RecorderResult<()> {
+        todo!()
+    }
 }