Initialize long URL hash to empty string so that it's not necessary to set it as non-nullable afterwards

module/Core/migrations/Version20260524105410.php

@@ -26,7 +26,7 @@ final class Version20260524105410 extends AbstractMigration
 
         $shortUrls->addColumn(self::COLUMN_NAME, Types::BINARY, [
             'length' => 32,
-            'notnull' => false, // Temporarily nullable until values have been filled
+            'default' => '', // Temporary value until they have been filled by next migration
         ]);
         $shortUrls->addIndex([self::COLUMN_NAME], self::INDEX_NAME);
     }

module/Core/migrations/Version20260607082210.php

@@ -20,15 +20,19 @@ final class Version20260607082210 extends AbstractMigration
         $qb = $this->connection->createQueryBuilder();
         $qb
             ->select('id', 'original_url')
-            ->from('short_urls');
+            ->from('short_urls')
+            // If this migration times out, this will ensure it can be rerun, and it will continue where it was left, so
+            // it can be run multiple times until all short URLs have been processed
+            ->where($qb->expr()->eq('long_url_hash', ':longUrlHash'))
+            ->setParameters(['longUrlHash' => '']);
         $shortUrlsResult = $qb->executeQuery();
 
-        $iteration = 0;
+        $iteration = 1;
         $this->connection->beginTransaction();
 
         while ($row = $shortUrlsResult->fetchAssociative()) {
             // Every few updates, commit the transaction and begin a new one
-            if (($iteration % 2000) === 0) {
+            if (($iteration % 10_000) === 0) {
                 $this->connection->commit();
                 $this->connection->beginTransaction();
             }

module/Core/migrations/Version20260609093926.php

@@ -1,26 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace ShlinkMigrations;
-
-use Doctrine\DBAL\Platforms\MySQLPlatform;
-use Doctrine\DBAL\Schema\Schema;
-use Doctrine\Migrations\AbstractMigration;
-
-/**
- * Makes long_url_hash non-nullable, now that previous migration has set the values for all existing entries
- */
-final class Version20260609093926 extends AbstractMigration
-{
-    public function up(Schema $schema): void
-    {
-        $shortUrls = $schema->getTable('short_urls');
-        $shortUrls->getColumn('long_url_hash')->setNotnull(true);
-    }
-
-    public function isTransactional(): bool
-    {
-        return !$this->connection->getDatabasePlatform() instanceof MySQLPlatform;
-    }
-}