add more indices to db tables

lib/Migration/Version16Date20240618183000.php

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+<?php
+
+declare(strict_types=1);
+
+namespace OCA\Money\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version16Date20240618183000 extends SimpleMigrationStep {
+
+  /**
+   * @param IOutput $output
+   * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+   * @param array $options
+   * @return null|ISchemaWrapper
+   */
+  public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+    $schema = $schemaClosure();
+
+    $accountsTable = $schema->getTable('money_accounts');
+    $accountsTable->addIndex(['book_id'], 'money_accounts_book_id_idx');
+
+    $transactionsTable = $schema->getTable('money_transactions');
+    $transactionsTable->addIndex(['date'], 'money_transactions_date_idx');
+
+    $splitsTable = $schema->getTable('money_splits');
+    $splitsTable->addIndex(['transaction_id'], 'money_splits_transaction_id_idx');
+    $splitsTable->addIndex(['dest_account_id'], 'money_splits_dest_account_id_idx');
+
+    return $schema;
+  }
+
+}

tests/Migration/Version16Date20240618183000Test.php

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+<?php
+
+namespace OCA\Money\tests\Migration;
+
+include_once __DIR__ . '/AbstractMigrationTestCase.php';
+
+class Version16Date20240618183000Test extends AbstractMigrationTestCase {
+
+  public function testAddIndices() {
+    $this->migrationService->migrate('16Date20240618183000');
+    $this->renewSchema();
+
+    $accountsTable = $this->schema->getTable('money_accounts');
+
+    $this->assertTrue($accountsTable->hasIndex('money_accounts_book_id_idx'));
+
+    $transactionsTable = $this->schema->getTable('money_transactions');
+
+    $this->assertTrue($transactionsTable->hasIndex('money_transactions_date_idx'));
+
+    $splitsTable = $this->schema->getTable('money_splits');
+
+    $this->assertTrue($splitsTable->hasIndex('money_splits_transaction_id_idx'));
+    $this->assertTrue($splitsTable->hasIndex('money_splits_dest_account_id_idx'));
+  }
+
+  protected function getPreviousMigrationName(): ?string {
+    return '15Date20240102222000';
+  }
+
+}