code: def unrecord(plugin_or_specs, filename):
      '''
      Remove a database migration record.
  
      \b
      A record can be expressed with the following syntaxes:
       - plugin filename
       - plugin fliename.js
       - plugin:filename
       - plugin:fliename.js
      '''
      plugin, filename = normalize_migration(plugin_or_specs, filename)
      migration = get_migration(plugin, filename)
      if migration:
          log.info('Removing migration %s:%s', plugin, filename)
          db = get_db()
          db.eval(UNRECORD_WRAPPER, migration['_id'])
      else:
          log.error('Migration not found %s:%s', plugin, filenamef unrecord(plugin_or_specs, filename):
      '''
      Remove a database migration record.
  
      \b
      A record can be expressed with the following syntaxes:
       - plugin filename
       - plugin fliename.js
       - plugin:filename
       - plugin:fliename.js
      '''
      plugin, filename = normalize_migration(plugin_or_specs, filename)
      migration = get_migration(plugin, filename)
      if migration:
          log.info('Removing migration %s:%s', plugin, filename)
          db = get_db()
          db.eval(UNRECORD_WRAPPER, migration['_id'])
      else:
          log.error('Migration not found %s:%s', plugin, filename)
docs: Remove a database migration record.
  
      \b
      A record can be expressed with the following syntaxes:
       - plugin filename
       - plugin fliename.js
       - plugin:filename
       - plugin:fliename.js