MigrationRequest:
   type: object
   required:
     - name
     - up
+    - down
     - datasource
   properties:
     name:
       type: string
       description: Name of the migration
       example: my_migration
     up:
       type: array
-      description: Steps to execute for the migration. Always provide a down migration as well when creating a migration that modifies the database
+      description: Steps to execute for the migration
       items:
         $ref: '#/components/schemas/MigrationStep'
     down:
       type: array
-      description: Steps to execute to revert the migration. Always provide this when creating a migration that modifies the database
+      description: Steps to execute to revert the migration
       items:
         $ref: '#/components/schemas/MigrationStep'
     datasource:
       type: string
       description: The data source to use
       example: default

 if (adminSecret) {
   headers['x-hasura-admin-secret'] = adminSecret;
 }
 
 const config: RequestInit = {
   ...options,
-  headers,
+  headers: {
+    ...options.headers,
+    ...headers,
+  },
 };
 
 return fetch(fullUrl, config);

 export const customFetch = async (
   url: string,
   options: RequestInit = {},
   appUrl?: string,
   adminSecret?: string,
 ): Promise<Response> => {
   // Allow overriding the base URL with appUrl parameter
   const baseUrl = appUrl || '';
   const fullUrl = `${baseUrl}${url}`;
 
+  try {
+    const response = await fetch(fullUrl, config);
+    if (!response.ok) {
+      throw new Error(`HTTP error! status: ${response.status}`);
+    }
+    return response;
+  } catch (error) {
+    console.error('Fetch error:', error);
+    throw error;
+  }
+