import { BaseSchema } from '@adonisjs/lucid/schema'
import env from '#start/env'

/**
 * release_chunks' indexes with its chunks in CHUNK_TABLESPACE (the HDD), not the catalog's tablespace: a chunk is
 * read from the HDD anyway, and the October partition's three indexes took 2.9 GB of the NVMe (its pkey never
 * scanned; LOG.md 2026-10-14 (54)). The parent's partitioned indexes too, so new partitions put theirs there.
 * Homelab was moved by hand first; a no-op where they're there already.
 */
export default class extends BaseSchema {
  async up() {
    const tablespace = env.get('CHUNK_TABLESPACE')
    if (!tablespace) return
    this.defer(async (db) => {
      const { rows } = await db.rawQuery(
        `SELECT i.relname FROM pg_class c JOIN pg_index x ON x.indrelid = c.oid JOIN pg_class i ON i.oid = x.indexrelid
         LEFT JOIN pg_tablespace t ON t.oid = i.reltablespace
         WHERE c.relname LIKE 'release_chunks%' AND coalesce(t.spcname, 'pg_default') <> ?`,
        [tablespace]
      )
      for (const { relname } of rows) await db.rawQuery(`ALTER INDEX ${relname} SET TABLESPACE ${tablespace}`)
    })
  }

  async down() {}
}