anchor.diff:   `id` INT(11) NOT NULL AUTO_INCREMENT,
    `topic_name` VARCHAR(255) NOT NULL,
    `project_id` INT(11) NOT NULL,
  - `username` VARCHAR(1000) NOT NULL,
  + `username` VARCHAR(150) NOT NULL,
    `permission_type` VARCHAR(255) NOT NULL,
    `operation_type` VARCHAR(255) NOT NULL,
    `host` VARCHAR(255) NOT NULL,
    `role` VARCHAR(255) NOT NULL,
     PRIMARY KEY (`id`),
  +  FOREIGN KEY (`username`) REFERENCES `users` (`email`) ON DELETE NO ACTION ON UPDATE NO ACTION,
     FOREIGN KEY `topic_idx` (`topic_name`, `project_id`) REFERENCES `project_topics` (`topic_name`, `project_id`) ON DELETE CASCADE ON UPDATE NO ACTION
   ) ENGINE=ndbcluster ;
   
  
positive.code:   KEY transaction_date_idx(transaction_date),
    KEY action_idx(action),
    KEY username_idx(username)
  ) ENGINE=ndbcluster;
  
  CREATE VIEW `projects_last_payment` AS
  
negative.code: (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `activity` varchar(128) NOT NULL,
    `hdfs_user_id` int(11) NOT NULL,
    `created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `parent_id` int NOT NULL,
    `name` varchar(255) NOT NULL,
  