Mattias Tall 74e9a52096 Fix Following page: replace 9-subquery-per-channel stats with 2 CTEs + indexes ...

The old _CHANNEL_STATS_SELECT ran 9 correlated subqueries for each
channel row. With 1266 channels that was ~11000 sub-executions per
GET /channels request, causing multi-second (or timeout) delays.

New approach: 2 CTEs (vinfo for counts/sums, nc for new_count) each do
a single aggregated pass over all followed-channel videos, joined back
to channels. Only 2 correlated LIMIT-1 subqueries remain for
latest_video_id/title (fast with the new index).

Also adds 4 indexes on startup (IF NOT EXISTS — safe to deploy):
- videos(channel_id, published_at DESC)  — latest video lookups
- videos(channel_id, indexed_at)         — new_count filter
- user_videos(video_id, user_id)         — watch/download aggregation
- user_channels(user_id, status)         — followed channel filter

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-26 16:04:41 +02:00

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