Tell Drupal 8 about a .install file for a module that didn't have one before

drupal8-fix-missing-extension-schema-version.sh

#!/bin/bash
#
# @file
# Tell Drupal 8 about a .install file for a module that didn't have one before.
#
# Very rarely, a Drupal 8 module might end up without a row in the `key_value`
# table's `system.schema` collection. When this happens, Drupal won't load its
# `.install` file. As of Drupal 8.4, it is only possible to fix this manually.
#
# You can fix this manually with the following drush command, assuming
# $module_name is the name of the module.
#

drush -y ev "drupal_set_installed_schema_version($module_name, 8000);"