"Thanks for the reply, but my issue is actually different from the chat session locking bug mentioned.
I am facing a Backend Infrastructure Timeout specifically affecting WebSockets in the Preview environment. Here are the technical details:
The Symptom: Every WebSocket connection (Twilio <-> Deepgram Bridge) is being hard-terminated at exactly 60 seconds.
The Error: Twilio reports Error 31921 (Connection reset without closing handshake).
What I’ve already tried: I have implemented application-level JSON heartbeats ('marks') and injected binary silence frames every 10 seconds to keep the connection active. These are being ignored by the gateway.
The Diagnosis: This looks like a hard-coded proxy_read_timeout or idle_timeout on the Preview Load Balancer/Ingress Controller.
Is this 60-second limit a hard constraint of the Preview Tier? If so, will moving this to a Production Deployment on Emergent remove this specific gateway timeout?"