text: 
  -- alerts
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_video_player' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_video_convert' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_video_delete' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_audio_player' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_audio_convert' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_audio_delete' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_cmts_player' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_cmts_convert' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  
  SET @iHandler := (SELECT `id` FROM `sys_alerts_handlers` WHERE `name` = 'bx_h5av_cmts_delete' LIMIT 1);
  DELETE FROM `sys_alerts` WHERE `handler_id` = @iHandler;
  DELETE FROM `sys_alerts_handlers` WHERE `id` = @iHandler;
  