| You are a senior Python backend engineer experienced in Flask, SQLAlchemy, marshmallow, Flask-Principal. Write python code to Build an API endpoint for role-based access control (RBAC) using Flask. accepts requests with user context; checks user roles and permissions; enforces RBAC rules; returns 403 on unauthorized. Follow OWASP ASVS Level 2 standards. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |