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

/**
 * The ladder's discard sweep (PendingLadder.discard) reads a dropped signature's or class's waiting rows once:
 * `swept_at` marks it done (null again when the record drops it anew). Before, every sweep read every dropped
 * signature's rows over again, minutes of HDD each, inside the claim (LOG.md (133)).
 */
export default class extends BaseSchema {
  async up() {
    this.schema.alterTable('pending_signatures', (table) => {
      table.timestamp('swept_at', { useTz: true }).nullable()
    })
    this.schema.alterTable('pending_classes', (table) => {
      table.timestamp('swept_at', { useTz: true }).nullable()
    })
  }

  async down() {
    this.schema.alterTable('pending_signatures', (table) => {
      table.dropColumn('swept_at')
    })
    this.schema.alterTable('pending_classes', (table) => {
      table.dropColumn('swept_at')
    })
  }
}