sendou.ink/migrations/010-fix-maps.js

module.exports.up = function (db) {
  for (const table of ["MapPool", "MapPoolMap"]) {
    db.prepare(`drop table "${table}"`).run();
  }

  db.prepare(`drop index calendar_event_map_pool_id`).run();
  db.prepare(`alter table "CalendarEvent" drop column "mapPoolId"`).run();

  // ---

  db.prepare(
    `
    create table "MapPoolMap" (
      "calendarEventId" integer,
      "stageId" integer not null,
      "mode" text not null,
      foreign key ("calendarEventId") references "CalendarEvent"("id") on delete cascade,
      unique("calendarEventId", "stageId", "mode") on conflict rollback
    ) strict
    `
  ).run();
  db.prepare(
    `create index map_pool_map_calendar_event_id on "MapPoolMap"("calendarEventId")`
  ).run();
};

module.exports.down = function (db) {
  db.prepare(`drop table "MapPoolMap"`).run();

  // ---

  db.prepare(
    `
    create table "MapPool" (
      "id" integer primary key,
      "code" text not null,
      "ownerId" integer not null,
      foreign key ("ownerId") references "User"("id") on delete restrict
    ) strict
    `
  ).run();
  db.prepare(`create index map_pool_owner_id on "MapPool"("ownerId")`).run();

  db.prepare(
    `
    create table "MapPoolMap" (
      "mapPoolId" integer not null,
      "stageId" integer not null,
      "mode" text not null,
      foreign key ("mapPoolId") references "MapPool"("id") on delete cascade
    ) strict
    `
  ).run();
  db.prepare(
    `create index map_pool_map_map_pool_id on "MapPoolMap"("mapPoolId")`
  ).run();

  db.prepare(
    `alter table "CalendarEvent" add "mapPoolId" integer references "MapPool"("id") on delete set null`
  ).run();
  db.prepare(
    `create index calendar_event_map_pool_id on "CalendarEvent"("mapPoolId")`
  ).run();
};