feat(db): add unique constraint on user.uuid#2016
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The uuid column stores collabPersonUuid, which must be unique per user. The existing non-unique idx_user_uuid provided no enforcement. Migration uses ALGORITHM=INPLACE, LOCK=NONE for zero-downtime on large tables. Skips if idx_user_uuid is absent (already migrated manually). Closes #1974
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johanib
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The uuid column stores collabPersonUuid, which must be unique per user. The existing non-unique idx_user_uuid provided no enforcement.
Migration uses ALGORITHM=INPLACE, LOCK=NONE for zero-downtime on large tables. Skips if idx_user_uuid is absent (already migrated manually).
Closes #1974