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** Branch linked: lp:~therp-nl/openobject-
server/ronald@therp.nl_fix_orm_lp1009014-trunk

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https://bugs.launchpad.net/bugs/1009014

Title:
  vacuum on transient model cannot work

Status in OpenERP Server:
  Confirmed

Bug description:
  For transient models there are some methods to automatically unlink
  old records, based on age or a count of records.

  At the same time there is logic that is intended to only cleanup older
  records, after the vaccum function has been called a number of times.

  The vacuum function is called:
  - from a cronjob
  - on each create call on a transient model

  problem is that te counter to prevent too frequent calls, is reset on
  every call. Therefore vacuum cleaning never gets done:

          self._transient_check_count += 1
          if (not force) and (self._transient_check_count % self._transient_check_time):
              self._transient_check_count = 0
              return True

  This problem masks another problem: if configuration is based on a
  maximum count of records, then when cleaning is done ALL existing
  records will be deleted. This might not be a problem is only one user
  is using the transient model at that time. But with multiple users,
  this is bound to result in errors...

  Therefore:
  - the counter should ONLY be reset when actual cleaning is done.
  - cleaning on number of records should leave a minimum amount of records, or alternatively, only delete records that have not been changed in say 10 minutes.

  I will create a branch containing these changes...

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