adjust down part for mysql 5

db/migrations/20240808118000_drop_unique_constraint_quota_definitions_name_key.rb

@@ -20,6 +20,11 @@
   down do
     if self.class.name.match?(/mysql/i)
       VCAP::Migration.with_concurrent_timeout(self) do
+        # mysql 5 is not so smart as mysql 8, prevent Mysql2::Error: Duplicate key name 'name'
+        alter_table :quota_definitions do
+          drop_index :name, name: :name if @db.indexes(:quota_definitions).include?(:name)
+        end
+
         alter_table :quota_definitions do
           add_unique_constraint :name, name: :name
         end