minor logging change and DB creation for the demo

src/utils/auth.rs

@@ -494,7 +494,7 @@ pub async fn create_refresh_token(
         },
     ) {
       Ok(cr) => cr,
-      Err(_) => return Err((StatusCode::INTERNAL_SERVER_ERROR, "error fetching credentials".to_string())),
+      Err(e) => return Err((StatusCode::INTERNAL_SERVER_ERROR, format!("error fetching credentials: {e}").to_string())),
     
     };