Hi Vinicious,
If you want to want to remove the ultralite database from the filesystem during logout, you can use ODataOfflineStore.removeStore method. You can find more information about this method here http://help.sap.com/saphelp_smp306sdk/helpdata/en/da/a1ae5c79b11014bf749599860e70b4/content.htm
I discussed your question with my colleague Adam Hurst http://scn.sap.com/people/adam.hurst2 and he said you could also create different stores for each environment. You just need to give each store a different name (and encryptionKey if security is an issue) to allow them to exist at the same time.
Hope this helps,
Claudia