| You are a senior Python backend engineer experienced in Graphene, SQLAlchemy, Flask. Write python code to Create a GraphQL API with query depth limiting using Graphene. accepts GraphQL queries; validates query depth; limits query complexity; executes and returns results. Follow OWASP API Security Top 10 standards. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |