Add a uniqueness constraint to the denormalised fullname model field.
BACKWARDS INCOMPATIBLE CHANGE.
If were using an earlier version of this code, you will need to change
the fullname field in the acacia_topic table to have a unique constraint
(previously, it was indexed, but not required to contain unique values,
which was an error in the design).
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36a0315commit 009f73b46c5c05b113a034e67441eab44e3574e5Malcolm Tredinnick
May 17, 2009