Daan MeijerandClaude Opus 5.5
fad1716d3a
Every probe rewrote its file's row on the HDD (content_type, archive): a new row version on a random page and an entry in each of the five indexes. They now live in file_details on the NVMe; files rows are inserted once. files:move-details copies the existing values after the deploy; a later migration drops the old columns. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
29 lines
1.2 KiB
TypeScript
29 lines
1.2 KiB
TypeScript
import { BaseSchema } from '@adonisjs/lucid/schema'
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/**
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* What inspection learns about a file (content type, archive listing) lives
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* in file_details, on the NVMe, instead of in `files` (LOG.md 2026-10-08 (14)).
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* `files` sits on the HDD and was updated after its insert by every probe:
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* a new row version on a random page and an entry in each of its indexes
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* (3.7M updates against 49.5M inserts in a day, 27% HOT). Its rows are now
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* only inserted (and moved between releases or renamed, rarely).
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* The existing values are copied by `files:move-details` after this deploy;
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* a later migration drops the columns.
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*/
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export default class extends BaseSchema {
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async up() {
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// The foreign key locks `files` briefly: take the lock first, so it can't deadlock with writers.
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await this.db.rawQuery(`SET LOCAL lock_timeout = '60s'`)
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await this.db.rawQuery(`LOCK TABLE files IN SHARE ROW EXCLUSIVE MODE`)
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await this.db.rawQuery(`
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CREATE TABLE IF NOT EXISTS file_details (
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file_id bigint PRIMARY KEY REFERENCES files (id) ON DELETE CASCADE,
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content_type varchar(16),
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archive jsonb)`)
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}
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async down() {
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await this.db.rawQuery(`DROP TABLE IF EXISTS file_details`)
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}
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}
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