Pass back the input to the pipeline for the SQLite-indexed bloblog writer

yama/src/pile/local_sqlitebloblogs.rs

@@ -714,7 +714,8 @@ impl RawPile for SqliteBloblogPile {
                     .expect("This is BAD: failed to send failure message to controller.");
             }
         });
-        todo!()
+
+        Ok(sender)
     }
 }