code: protected function importSchemaFile(string $schemaFile, string $controlTableName = null): void
      {
          if ($controlTableName !== null) {
              if ($this->db->getSchemaManager()->tablesExist([$controlTableName])) {
                  $this->output->writeln('<comment>Schema already exists in the database, skipping schema import for file <info>' . $schemaFile . '</info></comment>');
  
                  return;
              }
          }
  
          $this->runQueriesFromFile($schemaFile);
      }
docs: Handle inserting of schema, schema should ideally be in ISO SQL format.
  
  Schema file is created with: mysqldump ngsite --no-data > schema.sql