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

/**
 * One "ancient" range a group, articles 1 … (its first range − 1): what had expired on the server before the
 * group was planned (the planner cuts from the low watermark). Status 'ancient': nothing to fetch, never leased,
 * so the tiling is complete from article 1 and the span below the low watermark is on record (user, 2026-10-28).
 * Planner.historyRows adds it for groups planned from now on.
 */
export default class extends BaseSchema {
  async up() {
    this.schema.raw(
      `INSERT INTO ranges (group_id, start_id, end_id, next_id, priority, status)
       SELECT group_id, 1, min(start_id) - 1, 1, 0, 'ancient' FROM ranges GROUP BY group_id HAVING min(start_id) > 1`
    )
  }

  async down() {
    this.schema.raw(`DELETE FROM ranges WHERE status = 'ancient'`)
  }
}