Pointing completion at the source made every keystroke a 76-second query:
gs.osm_skinny is a plain view over rlarp.osm_stack, so ILIKE '%1601%'
scanned 6.9M rows and read 1.3M buffers off disk, 64s of it I/O. Nothing had
called that endpoint before, so the cost only appeared once a debounced
input was wired to it.
The source is the wrong list anyway. It reaches back over all of history and
would offer parts discontinued years ago; the version holds what was
actually loaded, which is what the forecast is being written against.
So GET /versions/:id/values/:col reads the version's own forecast table --
2.0s for 11,290 parts on fc_osm_skinny_29 -- and holds the result in memory,
keyed on that version's latest pf.log id. Any load, adjustment or undo moves
the id and the next request rebuilds, so nothing has to remember to
invalidate. Filtering happens over the cached array, so typing costs one
small max(id) query.
The column name is interpolated into the DISTINCT, so it is checked against
col_meta first.
The source-side endpoint keeps its new q/limit but no longer has a caller;
its ILIKE path against a view is the expensive one and should stay unused.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Paul Trowbridge
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