How to remove missed module

Probably you got error/warning The following module is missing from the file system, No such folder/file

To get list of installed modules

drush pm-list

Drupal 7 using Drush:

drush sql-query "DELETE from system where name = 'old_module1' AND type = 'module';"

Once done clear cache:

drush cc all

Drupal 8 using Drush:

drush sql-query "DELETE FROM key_value WHERE collection='system.schema' AND name='module_name';"

Once done clear cache:

drush cr