wrolpi/alembic
lrnselfreliance 5c78aa332d
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collections: listing answers channel and download queries from covering indexes (#740)
The listing still read every channel row (for the summary columns) and every download
row of the listed Collections (for the minimum frequency). Both tables store yt-dlp
info_json, so rows are tens of KB and each sits on its own scattered page; selecting
fewer columns did not help because the seek per row is the cost. From a cold disk
cache that was 5 s per table, 10+ s total, on a large library.

Two covering indexes, channel (collection_id, video_count, total_size) and
download (collection_id, frequency), answer both queries without touching a row. The
listing no longer loads Download objects at all; it computes min_download_frequency
with one grouped query and drops the unused `downloads` array from listing rows (the
detail endpoints keep it; the list views only read min_download_frequency).

Adds a models-vs-migrations test (alembic check) so an index or column added to a
model without a migration, or vice versa, fails the suite.

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
2026-09-27 12:53:40 -06:00
..
versions collections: listing answers channel and download queries from covering indexes (#740) 2026-09-27 12:53:40 -06:00
env.py Postgres -> SQLite hard cutover: the database moves into the media directory. 2026-07-12 14:09:37 -06:00
README A new start 2021-11-01 16:43:09 -06:00
script.py.mako Postgres -> SQLite hard cutover: the database moves into the media directory. 2026-07-12 14:09:37 -06:00

Generic single-database configuration.