/**
 * Implements hook_schema().
 */
function {{ machine_name }}_schema() {
  $schema['node'] = [
    // Example (partial) specification for table "node".
    'description' => 'The base table for nodes.',
    'fields' => [
      'nid' => [
        'description' => 'The primary identifier for a node.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ],
      'vid' => [
        'description' => 'The current {node_field_revision}.vid version identifier.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ],
      'type' => [
        'description' => 'The type of this node.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => '',
      ],
      'title' => [
        'description' => 'The node title.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ],
    ],
    'indexes' => [
      'node_changed'        => ['changed'],
      'node_created'        => ['created'],
    ],
    'unique keys' => [
      'nid_vid' => ['nid', 'vid'],
      'vid'     => ['vid'],
    ],
    // For documentation purposes only; foreign keys are not created in the
    // database.
    'foreign keys' => [
      'node_revision' => [
        'table' => 'node_field_revision',
        'columns' => ['vid' => 'vid'],
      ],
      'node_author' => [
        'table' => 'users',
        'columns' => ['uid' => 'uid'],
      ],
    ],
    'primary key' => ['nid'],
  ];
  return $schema;
}