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0.13
With more than one application server, validates_uniqueness_of becomes a lie.
Two app servers -> two requests -> two near-simultaneous uniqueness checks ->
two processes that commit to the database independently, violating this faux
constraint. You'll need a database-level constraint for cases like these.
consistency_fail will find your missing unique indexes, so you can add them and
stop ignoring the C in ACID.
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