Database           string    `json:"database"` // default: same as user
	QueueDir           string    `json:"queueDir"`
	QueueLimit         uint64    `json:"queueLimit"`
	MaxOpenConnections int       `json:"maxOpenConnections"`
}

// Validate PostgreSQLArgs fields
func (p PostgreSQLArgs) Validate() error {
	if !p.Enable {
		return nil
	}
	if p.Table == "" {
		return fmt.Errorf("empty table name")

	Password           string   `json:"password"`
	Database           string   `json:"database"`
	QueueDir           string   `json:"queueDir"`
	QueueLimit         uint64   `json:"queueLimit"`
	MaxOpenConnections int      `json:"maxOpenConnections"`
}

// Validate MySQLArgs fields
func (m MySQLArgs) Validate() error {
	if !m.Enable {
		return nil
	}

	if m.Format != "" {
		f := strings.ToLower(m.Format)

queue_dir            (path)               staging dir for undelivered messages e.g. '/home/events'
queue_limit          (number)             maximum limit for undelivered messages, defaults to '100000'
max_open_connections (number)             maximum number of open connections to the database, defaults to '2'
comment              (sentence)           optionally add a comment to this setting
```

or environment variables

```

			Table:              env.Get(tableEnv, kv.Get(target.MySQLTable)),
			QueueDir:           env.Get(queueDirEnv, kv.Get(target.MySQLQueueDir)),
			QueueLimit:         queueLimit,
			MaxOpenConnections: maxOpenConnections,
		}
		if err = mysqlArgs.Validate(); err != nil {
			return nil, err
		}
		mysqlTargets[k] = mysqlArgs
	}
	return mysqlTargets, nil
}

		},
		config.KV{
			Key:   target.PostgresQueueLimit,
			Value: strconv.Itoa(int(cfg.QueueLimit)),
		},
		config.KV{
			Key:   target.PostgresMaxOpenConnections,
			Value: strconv.Itoa(cfg.MaxOpenConnections),
		},
	}

	return nil
}

// SetNotifyNSQ - helper for config migration from older config.
func SetNotifyNSQ(s config.Config, nsqName string, cfg target.NSQArgs) error {
	if !cfg.Enable {