fix(preview): Handle unique constraints violation exception

[CarlSchwan]

• Resolves: [Bug]: Integrity constraint violation: 1062 Duplicate entry for key 'previews_file_uniq_idx' #58587

Summary

Delete the preview from storage and fetch the actual one from the DB. This should not happen often.

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[CarlSchwan]

/backport to stable34

[solracsf]

I don't think the recovery path works as written, worth review in case I'm missing a key info here.

getPreviewForSpecification() builds its WHERE clause from raw array keys used as literal column names. The caller passes 'fileId', but the column is actually file_id, that's a genuine SQL "unknown column" error, thrown before findOneQuery() ever reaches the DoesNotExistException catch this method relies on.

So the exact race this PR targets would still crash, just with a different exception than before.
😿

[AndyXheli]

Hey @CarlSchwan still seeing this on NC 34.0.2 do need to open a new request? or will it be on NC34.0.3

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'previews_file_uniq_idx'\",\"code\":\"23000\",\"file\":\"/var/www/nextcloud/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php:130\",\"trace\":\"#0 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php(130): PDOStatement->execute()\\n#1 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1212): Doctrine\\DBAL\\Driver\\PDO\\Statement->execute()\\n#2 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connections/PrimaryReadReplicaConnection.php(292): Doctrine\\DBAL\\Connection->executeStatement()\\n#3 /var/www/nextcloud/lib/private/DB/Connection.php(469): Doctrine\\DBAL\\Connections\\PrimaryReadReplicaConnection->executeStatement()\\n#4 /var/www/nextcloud/lib/private/DB/ConnectionAdapter.php(76): OC\\DB\\Connection->executeStatement()\\n#5 /var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php(279): OC\\DB\\ConnectionAdapter->executeStatement()\\n#6 /var/www/nextcloud/lib/public/AppFramework/Db/QBMapper.php(128): OC\\DB\\QueryBuilder\\QueryBuilder->executeStatement()\\n#7 /var/www/nextcloud/lib/private/Preview/Db/PreviewMapper.php(68): OCP\\AppFramework\\Db\\QBMapper->insert()\\n#8 /var/www/nextcloud/lib/private/Preview/Generator.php(594): OC\\Preview\\Db\\PreviewMapper->insert()\\n#9 /var/www/nextcloud/lib/private/Preview/Generator.php(566): OC\\Preview\\Generator->savePreview()\\n#10 /var/www/nextcloud/lib/private/Preview/Generator.php(184): OC\\Preview\\Generator->generatePreview()\\n#11 /var/www/nextcloud/lib/private/Preview/Generator.php(95): OC\\Preview\\Generator->generatePreviews()\\n#12 /var/www/nextcloud/lib/private/PreviewManager.php(183): OC\\Preview\\Generator->getPreview()\\n#13 /var/www/nextcloud/apps/files_sharing/lib/Controller/PublicPreviewController.php(133): OC\\PreviewManager->getPreview()\\n#14 /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php(165): OCA\\Files_Sharing\\Controller\\PublicPreviewController->getPreview()\\n#15 /var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php(78): OC\\AppFramework\\Http\\Dispatcher->executeController()\\n#16 /var/www/nextcloud/lib/private/AppFramework/App.php(137): OC\\AppFramework\\Http\\Dispatcher->dispatch()\\n#17 /var/www/nextcloud/lib/private/Route/Router.php(324): OC\\AppFramework\\App::main()\\n#18 /var/www/nextcloud/lib/base.php(1172): OC\\Route\\Router->match()\\n#19 /var/www/nextcloud/index.php(25): OC::handleRequest()\\n#20 {main}\"}}}}","CustomMessage":"An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '3424101-64-64-13-1--1' for key 'previews_file_uniq_idx'"},"id":"6a6ce6195590f"}