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Migration_20260610_120000_Db.php
31 lines
| 1 | <?php declare(strict_types = 1); |
| 2 | |
| 3 | namespace MailPoet\Migrations\Db; |
| 4 | |
| 5 | if (!defined('ABSPATH')) exit; |
| 6 | |
| 7 | |
| 8 | use MailPoet\Entities\SubscriberSegmentEntity; |
| 9 | use MailPoet\Migrator\DbMigration; |
| 10 | |
| 11 | class Migration_20260610_120000_Db extends DbMigration { |
| 12 | public function run(): void { |
| 13 | $subscriberSegmentTable = $this->getTableName(SubscriberSegmentEntity::class); |
| 14 | |
| 15 | // Index (segment_id, status, subscriber_id) so per-list status counts can seek |
| 16 | // instead of scanning the whole membership table. The listing's status tabs |
| 17 | // under a list filter previously ran a COUNT(DISTINCT) per status, each a full |
| 18 | // scan of the segment's memberships (tens of seconds on large lists). With this |
| 19 | // index a sparse status (e.g. unsubscribed) becomes a direct seek, and the |
| 20 | // dominant "subscribed" mass is read index-only as a plain COUNT — so the tab |
| 21 | // strip is derived from cheap index reads rather than million-row joins. The |
| 22 | // trailing subscriber_id makes the index covering for the membership lookups. |
| 23 | if (!$this->indexExists($subscriberSegmentTable, 'segment_id_status')) { |
| 24 | $this->connection->executeQuery( |
| 25 | "ALTER TABLE `{$subscriberSegmentTable}` |
| 26 | ADD INDEX `segment_id_status` (`segment_id`, `status`, `subscriber_id`)" |
| 27 | ); |
| 28 | } |
| 29 | } |
| 30 | } |
| 31 |