Dscl and hidden users, how to

hi all!
could you pls help me with dscl?
I've created new user names pgsql (for postgres) with these commands:
dscl . create /Users/_pgsql
dscl . append /Users/_pgsql UserShell /bin/bash
dscl . append /Users/_pgsql UniqueID 113
dscl . append /Users/_pgsql PrimaryGroupID 113
dscl . append /Users/_pgsql NFSHomeDirectory /usr/local/pgsql/
dscl . append /Users/_pgsql RealName "PostgreSQL Server"
dscl . append /Users/_pgsql RecordName pgsql
how i can make this account hidden (like _www for instance)? I've added it to hidden list to hide from login window, but it is not the same as for _www you know.

Many people using the Shared Folder find that they have permissions issues which mean that they 'other' user can't see some part of the Library. Therefore, if you want to share the Library in that way it's best moved to an external disk formatted Mac OS Extended (Journaled) and set to ignore ownership and permissions.
can both users add photos from their iPhones via iPhoto on their respective accounts and have the new photos show up on the other users iPhoto app?
Yes.
would the newly added photos sharing be automaticall be set to the folder sharing settings?  ie, view and edit for both users?
Yes.
if i edit the photos with say photoshop, will the changes show up in iphoto?
If you set this up corrrectly -  You can set Photoshop (or any image editor) as an external editor in iPhoto. (Preferences -> General -> Edit Photo: Choose from the Drop Down Menu.) This way, when you double click a pic to edit in iPhoto it will open automatically in Photoshop or your Image Editor, and when you save it it's sent back to iPhoto automatically. This is the only way that edits made in another application will be displayed in iPhoto.
You will need to do this in both accounts.
would timemachine back the data up automatically?
TM can be set to back up externals. There are other options too, of course.
when I upgrade to a new computer will everything work the same.
Yes. Just plug in the extenal and point iPhoto at the external from the new machine.
Regards
TD

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