`Duplicate key` internal error during review creation

See #94, release log:

• 8d537e5 by @yegor256: #94 redirect
• b6c187d by @yegor256: #94 tested and fixed
• c31e8a0 by @yegor256: #80 layout
• 87ac1e9 by @yegor256: #80 layout

Released by Rultor 1.68.13, see build log