This introduces two different tweaks to database code that users have reported help in reducing deadlock and other performance issues.
We don't believe these should cause *worse* performance in any case, but here are the changes:
* Introduce application locks to reduce deadlocks in `FeedPackageVersions_DeletePackageVersion` and `FeedPackageVersions_CreateOrUpdatePackageVersion`
* Remove transactional locking from `PackageNameIds_GetOrCreatePackageNameId`, `PackageVersionIds_GetOrCreatePackageVersionId`
Let us know if you would like more details on tihs one, or are closely monitoring database performance on your instance.