diff --git a/packages/e2e-test/src/commands/run.ts b/packages/e2e-test/src/commands/run.ts
index b57e426116..20b2753f6b 100644
--- a/packages/e2e-test/src/commands/run.ts
+++ b/packages/e2e-test/src/commands/run.ts
@@ -69,7 +69,10 @@ export async function run() {
   print('Starting the app');
   await testAppServe(pluginId, appDir);
 
-  if (Boolean(process.env.POSTGRES_USER) || Boolean(process.env.MYSQL_USER)) {
+  if (
+    Boolean(process.env.POSTGRES_USER) ||
+    Boolean(process.env.MYSQL_CONNECTION)
+  ) {
     print('Testing the database backend startup');
     await preCleanDatabase();
     const appConfig = path.resolve(appDir, 'app-config.yaml');
diff --git a/plugins/app-backend/migrations/20211229105307_init.js b/plugins/app-backend/migrations/20211229105307_init.js
index 9a05f97198..25ed48c307 100644
--- a/plugins/app-backend/migrations/20211229105307_init.js
+++ b/plugins/app-backend/migrations/20211229105307_init.js
@@ -21,7 +21,7 @@
  */
 exports.up = async function up(knex) {
   const isMySQL = knex.client.config.client.includes('mysql');
-  return knex.schema.createTable('static_assets_cache', table => {
+  await knex.schema.createTable('static_assets_cache', table => {
     table.comment(
       'A cache of static assets that where previously deployed and may still be lazy-loaded by clients',
     );
@@ -32,7 +32,6 @@ exports.up = async function up(knex) {
         .notNullable()
         .comment('The path of the file');
     } else {
-      // cannot have a unique key in mysql with a text column greater than 733 bytes
       table.text('path').notNullable().comment('The path of the file');
     }
     table
@@ -45,6 +44,12 @@ exports.up = async function up(knex) {
     table.binary('content').notNullable().comment('The asset content');
     table.index('last_modified_at', 'static_asset_cache_last_modified_at_idx');
   });
+  // specifically for mysql specify a unique index up to 254 characters(mysql limit)
+  if (isMySQL) {
+    await knex.schema.raw(
+      'create unique index static_assets_cache_path_idx on static_assets_cache(path(254));',
+    );
+  }
 };
 
 /**