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Unverified Commit e9f6dbdf authored by cmrd Senya's avatar cmrd Senya Committed by Benjamin Neff
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Add unique index to poll participations on author_id and poll_id

Previously we had only a Rails validation which ensured poll participation
uniqueness but this adds uniqueness control to the database level, so that
uniqueness is guaranteed even when changing data with avoiding Rails
validations.

closes #7798
parent b7cd9d62
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