Question: Hello friends I am an android developer and right now i am working on sencha touch framework on android platform to develop an app which can run on multi platform e.g android tablets and ipads.

But i have question in my mind that if i create my app on android tablet emulator according to the android tablet need(means layout configuration),will the same app work on ipad? or i have to work on simulator to make it work on ipad? Please suggest me with ur views.

Thanx in advance.

Answer: 
For an audit table within the DB itself, have a look at the [PL/pgSQL Trigger Audit Example](http://www.postgresql.org/docs/8.4/static/plpgsql-trigger.html#PLPGSQL-TRIGGER-AUDIT-EXAMPLE)

This logs every INSERT, UPDATE, DELETE into another table.
Whenever we had to do this, we overrode signals for every model and possible action. 

<https://docs.djangoproject.com/en/dev/topics/signals/>

You can have the signal do whatever you want, from injecting some HTML into the page, to making an entry in the database. They're an excellent tool to learn to use.