cmrd Senya e9f6dbdffd 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		2018-05-03 21:28:38 +02:00
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migrate	Add unique index to poll participations on author_id and poll_id	2018-05-03 21:28:38 +02:00