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When migrating repositories with reactions with deleted users, the original
author id may be -1. This means that it is possible to end up attempting
to create multiple reactions with the same [ Type, IssueID, CommentID, UserID,
OriginalAuthorID ] thus breaking the constraints.
On SQLite this appears to cause a deadlock but on other dbs this will
cause the migration to fail.
This PR extends the constraint to include the original author username
in the constraint.
Fix #13271
Signed-off-by: Andrew Thornton <art27@cantab.net>
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