[AppDB] (resend2) Various small fixes for url

[Alexander Nicolaysen Sørnes]

I think these small fixes could go into one patch, as there are no files using 
them at the moment anyway.

- Add silent parameters for create() and update()
- Add and use canEdit()
- Fix queue status on create()

Resend: Also fetch id in create() if silent is true, return false in update() 
if id is not set

Regards,

Alexander N. Sørnes
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