- getDmConversations: DISTINCT ON (partner) ORDER BY partner, created_at DESC
→ one row per conversation in a single indexed query instead of fetching
up to 500 rows and de-duplicating in JS
- add indexes on direct_messages (sender_id,created_at DESC),
(receiver_id,created_at DESC), (receiver_id,read_at) — table had none, so
every conversation-list load (runs per user on app launch for the badge)
was a full-table scan + sort
- lyra.tsx: drop the welcome-back greeting that fired on every first coach
open per session regardless of protection status/language (always German,
unconditional). Endpoint kept for future conditional use
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
