Clean backend reset flow

backend/docker-compose.dev.yml

@@ -13,7 +13,7 @@ services:
     volumes:
       - db_data:/var/lib/mysql
     healthcheck:
-      test: ["CMD", "mysql", "-uroot", "-proot", "-e", "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema='Petstoredb' AND table_name='users';"]
+      test: ["CMD", "mysqladmin", "ping", "-h", "127.0.0.1", "-uroot", "-proot"]
       interval: 10s
       timeout: 5s
       retries: 30