import { BaseSchema } from '@adonisjs/lucid/schema'

/**
 * probe_cache's primary key in the catalog's tablespace (default_tablespace: nvme on homelab); the table stays on the
 * HDD. Each claim looks its candidates up by message_id (`message_id = ANY(…)`): with the index on the HDD that took
 * 1.27 s a claim, 48 s of each minute, the prober's lanes waiting on claims (LOG.md 2026-10-18 (76)). ~97% aren't in it,
 * so only the index is read. Homelab moved it by hand (prober stopped); a no-op where it's there already, or without a
 * default tablespace (tests).
 */
export default class extends BaseSchema {
  async up() {
    this.defer(async (db) => {
      const { rows: setting } = await db.rawQuery(`SELECT current_setting('default_tablespace') AS target`)
      const target = setting[0].target
      if (!target) return
      const { rows } = await db.rawQuery(
        `SELECT 1 FROM pg_class c LEFT JOIN pg_tablespace t ON t.oid = c.reltablespace
         WHERE c.relname = 'probe_cache_pkey' AND coalesce(t.spcname, 'pg_default') <> ?`,
        [target]
      )
      if (rows.length > 0) await db.rawQuery(`ALTER INDEX probe_cache_pkey SET TABLESPACE ${target}`)
    })
  }

  async down() {}
}