feat: Add index to executions created_at column

packages/backend/src/db/migrations/20250319192925_add_index_to_executions_created_at_column.js

@@ -0,0 +1,11 @@
+export async function up(knex) {
+  return await knex.schema.table('executions', (table) => {
+    table.index('created_at');
+  });
+}
+
+export async function down(knex) {
+  return await knex.schema.table('executions', (table) => {
+    table.dropIndex('created_at');
+  });
+}