[Tickets #11187] Add an undelete feature for Kronolith Events

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Ticket URL: http://bugs.horde.org/ticket/11187
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  Ticket             | 11187
  Created By         | Ralf Lang (B1 Systems GmbH) <lang at b1-systems.de>
  Summary            | Add an undelete feature for Kronolith Events
  Queue              | Kronolith
  Version            | Git develop
  Type               | Enhancement
  State              | New
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Ralf Lang (B1 Systems GmbH) <lang at b1-systems.de> (2012-05-10 11:07) wrote:

Users accidentally delete events, at times even through remote  
interfaces we cannot completely control.

There should be a feature to track and undo recent delete event  
actions for future versions.
We already track the delete event for syncing purposes.

Should undeleting be implemented driver-agnostic (through added  
details in the horde_histories delete action or through a specific  
undo table) or should it make use of backend specific features and  
only be implemented for certain backends?

How should undelete deal with the sync-relevant history entries?