[Tickets #12498] SQL Syntax error or access violation updating Horde_History DB schema

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Ticket URL: http://bugs.horde.org/ticket/12498
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  Ticket             | 12498
  Created By         | lp.allard.1 at gmail.com
  Summary            | SQL Syntax error or access violation updating
                     | Horde_History DB schema
  Queue              | Horde Framework Packages
  Version            | Git master
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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lp.allard.1 at gmail.com (2013-07-25 00:31) wrote:

Trying to update the Horde_History database schema after pear package  
update, the configuration page displays that the DB schema as outdated  
for Horde_History but displays the following message when trying to  
update its schema:

SQLSTATE[42000]: Syntax error or access violation: 1091 Can't DROP  
'index_horde_histories_on_history_modseq'; check that column/key exists

Horde database created by H4 about a year ago, reused by H5.1.1 now.