docs: def _check_db_exists(self, instance):
          """
          Check if the database we're targeting actually exists
          If not then we won't do any checks
          This allows the same config to be installed on many servers but fail gracefully
          """
  
          dsn, host, username, password, database, driver = self._get_access_info(instance, self.DEFAULT_DB_KEY)
          context = "{} - {}".format(host, database)
          if self.existing_databases is None:
              cursor = self.get_cursor(instance, None, self.DEFAULT_DATABASE)
  
              try:
                  self.existing_databases = {}
                  cursor.execute(DATABASE_EXISTS_QUERY)
                  for row in cursor:
                      self.existing_databases[row.name] = True
  
              except Exception as e:
                  self.log.error("Failed to check if database {} exists: {}".format(database, e))
                  return False, context
              finally:
                  self.close_cursor(cursor)
  
          return database in self.existing_databases, context