Hey Aziz,
Google Groups isn't really the right place to look for 1-on-1 support. Generally, a question like this should either be answered through opening a
support ticket, or through posting to
stackoverflow with enough information that somebody could begin to understand the problem. In this case, that information might be:
* What do you mean by "facing a shortage of storage for data on appengine"? (I think you mean something else since there's more storage available in the cloud (if you can pay for it) than most developers even think)
* What do you mean by "the application gets disconnected"?
* What do you mean by "delete the old forms and make room for new ones"?
* What does a "short term solution" look like?
If you ask a good question, you'll get a good answer, generally. I wish you the best of luck in moving forward to either post to stackoverflow or to ask a Technical Solutions Representative through a support ticket.
Sincerely,
Nick