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

/**
 * probe_candidates, with its indexes, in the catalog's tablespace (default_tablespace: nvme on homelab), out of
 * CHUNK_TABLESPACE where migration 6000 put it: the prober's catalog claim updates it from random points every
 * minute, and on the HDD, beside the pending ladder's sweep and autovacuum, a claim took 2–3 minutes with all the
 * lanes waiting (LOG.md 2026-11-03 (136)). Homelab moved it by hand (edge, node-api and the workers stopped; ~8 GB);
 * 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 c.relname, c.relkind FROM pg_class c LEFT JOIN pg_tablespace t ON t.oid = c.reltablespace
         WHERE (c.relname = 'probe_candidates' OR c.oid IN (SELECT indexrelid FROM pg_index WHERE indrelid = 'probe_candidates'::regclass))
           AND c.relkind IN ('r', 'i') AND coalesce(t.spcname, 'pg_default') <> ?
         ORDER BY c.relkind DESC, c.relname`,
        [target]
      )
      for (const { relname, relkind } of rows) {
        await db.rawQuery(
          `ALTER ${relkind === 'i' ? 'INDEX' : 'TABLE'} ${relname} SET TABLESPACE ${target}`
        )
      }
    })
  }

  async down() {}
}