## Summary - Closes #31 - Ignore WebSocket `type: ping` heartbeats so keepalives no longer create conversations or hit title/LLM pipelines - Reject empty/whitespace user messages in both chat consumers, `PromptSerializer`, and REST conversation prompt POST ## Test plan - [x] `UserPromptGuardTestCase`, `PromptSerializerTestCase` blank/whitespace cases - [x] `WebSocketReceiveGuardTestCase` ping ignore + empty message rejection (both WS routes) - [ ] Deploy to beta; leave idle tab open and confirm no new rogue conversations - [ ] Confirm normal chat send still works Related FE: https://git.aimloperations.com/ai_ml_operations/chat_web_app/issues/51Reviewed-on: #32