src/Migrator.php
public function configure()
    {
        if ($this->isConfigured()) {
            return;
        }

        foreach ($this->dbal->getDatabases() as $db) {
            $schema = $db->table($this->config->getTable())->getSchema();

            // Schema update will automatically sync all needed data
            $schema->primary('id');
            $schema->string('migration', 255)->nullable(false);
            $schema->datetime('time_executed')->datetime();
            $schema->index(['migration']);

            $schema->save();
        }
    }
public function configure()
    {
        if ($this->isConfigured()) {
            return;
        }

        foreach ($this->dbal->getDatabases() as $db) {
            $schema = $db->table($this->config->getTable())->getSchema();

            // Schema update will automatically sync all needed data
            $schema->primary('id');
            $schema->string('migration', 255)->nullable(false);
            $schema->datetime('time_executed')->datetime();
            $schema->index(['migration']);

            $schema->save();
        }
    }
Configure all related databases with migration table.