pub fn post_deactivate_function(mut self, func: unsafe extern "C" fn() -> i32) -> Self {
        self.post_deactivate_func = Some(func);
        self
    }
Sets the post request shutdown function for the extension.

This function can be useful if you need to do any final cleanup at the
very end of a request, after all other resources have been released. For
example, if your extension creates any persistent resources that last
beyond a single request, you could use this function to clean those up.
# Arguments

* `func` - The function to be called when shutdown is requested.
src/builders/module.rs