Root cause of "alle Nachrichten verschlüsselt + kann nicht schreiben":
uploadUserKeyBlob (called by setupNewUserIdentity, changePin and
regenerateRecoveryCode) routed through reset_user_key, which DELETES
every conversation_keys row addressed to the user or one of their
devices. So setting a PIN destroyed every legacy bundle BEFORE the
migration could re-wrap them. The user ended up with user_keys set,
zero un-migrated bundles, no decryption, no send.
Fixes shipped:
* supabase/migrations/20260516000001_user_key_rpcs_v2.sql
- upsert_user_key: same UPSERT, NO delete. Used everywhere except
"Identität zurücksetzen" (which keeps reset_user_key on purpose).
- rotate_conv_key: bumps active_key_version atomically and inserts
a fresh batch of bundles (per-user + per-device fallback).
* shared/auth/userKey.ts: uploadUserKeyBlob now calls upsert_user_key.
* shared/chat/convKeys.ts: new rotateConvKey() that wraps the fresh
conv-key for every member's user_keys (preferred) and falls back to
each member's per-device public_key for peers still on 0.17.x.
* shared/chat/convKeys.ts: getOrCreateConvKey auto-triggers rotate
when the user has no recipient_user_id row at the active version
but rows exist (the deadlock case). Existing outbox retries drain
on their own once the rotate completes — no manual button.
* desktop/MessageBubble.tsx: "...cannot decrypt" is now a softer,
German "Nachricht nicht lesbar" so users don't think the app
crashed when historical messages can't be unwrapped.
byGalax
d39a0fb6dc