[doc] DB migration mechanism

[Sebastian Birnbach]

Upgrade or deletion of Horde database schemas can be controlled through
files in <appname>/migration/*. The admin console will notice a new file in
this directory and offer the right  "update DB schema"-button, which will
call the "up" function defined in the file.

Unfortunately, this is about all I could find on the upgrade mechanism. Too
little for using or understanding it, especially since the file naming
convention is unclear to me.

Could someone please shed some light on this?

  Sebastian
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