allow lazy people to mark all notifcations as read

src/model/notification.rs

@@ -194,6 +194,15 @@ ORDER BY read_at DESC, created_at DESC;
             }
         }
     }
+
+    pub(crate) async fn mark_all_read(db: &SqlitePool, user: &User) {
+        let notifications = Self::for_user(db, user).await;
+
+        for notification in notifications {
+            notification.mark_read(db).await;
+        }
+    }
+
     pub(crate) async fn delete_by_action(db: &sqlx::Pool<Sqlite>, action: &str) {
         sqlx::query!(
             "DELETE FROM notification WHERE action_after_reading=? and read_at is null",