I'm a bit confused by your message. In my reply, I will assume that you are asking only about actions to be taken upon completion of request handling, despite the fact that you use the word "cleanup" which, in the Ur/Web runtime system, has a meaning which involves actions being taken before a request finishes.

Marc Weber wrote:
This requires two callbacks:
- one for decreasing the usage counter on Ruby objcets (similar to when
   uw_malloc storage is freed)
   (uw_register_transactional or uw_set_global could be abused ?)
- one callback to clear the cache (eg of http requests) after a request
   stops being executed which is called in all cases:
     * retried too often, fatal, or success

These both seem like straightforward uses of the "free" callback passed to uw_register_transactional().

BTW, "uw_malloc() storage" is never "freed," and there are no "counters" involved.

Is there a way to run code on startup ?

Yes.  Write something like:

task initialize = (* something of type [transaction {}] *)

The timing of this might not be quite what you expect, so let me know if you need a new task type that runs at different times.

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