curl -X POST "http://localhost:8000/api/v2/agents/my-agent/supersede/mem_old123" \
-H "Authorization: Bearer your_api_key" \
-H "X-Session-Token: your_session_token" \
-H "Content-Type: application/json" \
-d '{"new_content":"User is now Director of Finance","reason":"Promotion announced"}'