signal-desktop/ts/sql/migrations/50-fix-messages-unread-index.ts

// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import type { Database } from '@signalapp/better-sqlite3';

import type { LoggerType } from '../../types/Logging';

export default function updateToSchemaVersion50(
  currentVersion: number,
  db: Database,
  logger: LoggerType
): void {
  if (currentVersion >= 50) {
    return;
  }

  db.transaction(() => {
    db.exec(
      `
      DROP INDEX messages_unread;

      -- Note: here we move to the modern isStory/storyId fields and add received_at/sent_at.
      CREATE INDEX messages_unread ON messages
        (conversationId, readStatus, isStory, storyId, received_at, sent_at) WHERE readStatus IS NOT NULL;
      `
    );

    db.pragma('user_version = 50');
  })();

  logger.info('updateToSchemaVersion50: success!');
}