Help with iCal restore

Hello,

One of our users lost her calendar data last week. The iCal service itself seems fine - no one else has lost their data, and I can log into the user in question's iCal client (or the web calendar) and create items. It is as if somehow all the items were selected and deleted.

Any road, we need to do a restore of her data. Apple Enterprise support wouldn't help, they said that restoring Postgres data was beyond their scope (a little off-putting that they aren't willing to help restore data on their own server, but that's another topic...).

We have successful Time Machine backups, and know the approximate date the data disappeared.

I've read a few pages that refer to ways we can restore from the Postgres 'dumpall' file that is created each day, but I could use some help with specifcs.

Can any of you kind souls please help us out with instructions (e.g. stop the Postgres service, run such-and-such a command, etc.)?

Also, how do we 'merge' the data from said user into our existing DB? Or do we simply restore the backup, log in as her to export her calendar, then start the present DB back up?

Any help is greatly appreciated.