[Developers] Write quotas and syncing sandbox

[Tom Morris]

1. Do writes with "create" : "unless_exists" count against my write
quota if they return "existed"?  I'm trying to figure out whether I
need to go to the extra trouble to do a read and check the results
first in order to make my quota last as long as possible.  Is there a
way to tell how much quota is left?  When does the counter get reset?

2. Is there a way to extract a "diff" from the production database and
apply it to the sandbox or are my choices limited to a) writing my own
tool, b) doing my updates twice or c) waiting for Monday?  I working
on a data uploading utility that I'm testing against the sandbox, but
some of the data cleanups that it needs I've been doing on the
production database.

Tom