[Tickets #7914] Re: MDB2_Schema Error: schema validation error

[bugs at horde.org]

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Ticket URL: http://bugs.horde.org/ticket/7914
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  Ticket             | 7914
  Updated By         | el.baby at gmail.com
  Summary            | MDB2_Schema Error: schema validation error
  Queue              | Horde Groupware Webmail Edition
  Version            | 1.2.2
  Type               | Bug
  State              | Not A Bug
  Priority           | 1. Low
  Milestone          | 1.2.4
  Patch              |
  Owners             | Jan Schneider
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el.baby at gmail.com (2009-09-16 10:48) wrote:

FWIW, I just got this exact problem upgrading from 1.2.3 (which comes  
from older upgrades) into 1.2.4:

Running pre-update scripts...

Writing main configuration file
Loading database module...
Updating database...
[ ERROR! ] Reading the existing table structure failed. Error messages:
MDB2_Schema Error: schema validation error
default value of "alarm_start" is incorrect: "" is not of type "timestamp"

Running post-update scripts...
Done updating Horde Groupware Webmail Edition.

I still don't have an indication if the horde_alarms table was updated  
and even if the rest of the database was correctly updated... or what  
can I do to prevent this from happening (I can restore my backup, but  
re-doing the same steps will probably lead to the same error).