mark some future processes.

src-tauri/src/config_db.rs

@@ -94,6 +94,7 @@ impl ConfigDb {
             .collect::<Vec<u8>>();
         db.remove(key)
             .map_err(|e| anyhow::anyhow!("Unable to remove pattern: {}", e))?;
+        // todo: need to remove requested pattern in all playlists.
         db.flush_async()
             .await
             .map_err(|e| anyhow::anyhow!("Unable to save db: {}", e))?;