Promoting Postgres Database member to active with irule.

we are doing an project something like that. there will be 2 pg node one is master and one is slave. I will write an pg health monitor to select who master is and put those two into same pool with the priority group activation. we will change the nodes manually but if you do not want any manual thing, you must write a simple select script like the one used above from database then according to that script's result, you should take action.