Group inserts were using recipient_id=0 as a "no recipient" sentinel,
which fails the tenants FK (foreign_keys is ON) and 500s on every
group send. Use the sender's own id as the placeholder instead;
group GET queries already key off room_uid so there's no self-message
artefact from the value.
Also exclude group rows from /api/chat/sent so the client's
last_sent_relay_id cursor doesn't stall on group sends that never
reach seen=1 (group receipts aren't tracked in v1).
Client-side: surface a clearer error when a room create hits a 404
on the relay — almost always means the relay is running pre-group
code and needs a restart.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
thandClaude Opus 4.6
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