Freezing records in a model after a set time

I would like to enable a user to insert and modify a record in a django model for a specific stretch of time, say one hour, and,when this time's up (for that specific record), the user shouldn't be allowed to modify or delete the record. Another user (kind of a superuser) with higher permissions should be enabled to modify or delete the record after that time has elapsed
Before starting to code a python script to obtain that I would like to know if there is any Github or other "out-of-the-box"django package doing something like that.

Thanks a lot
Vittorio

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