Do not have FK pointing to a main repo from a DistributionTree Variant
Since DistributionTree is tied to a Repository, we need to create a new DistributionTree for each.
In order to achieve that, we should introduce a new field
repository_id and have it as a unique index.
Also fix the Addon and Variant models to point to RpmRepository rather than the master model. Migration is needed, during which a new DistributionTree will be created in case it belongs to multiple repos. Make sure that only one DistributionTree can be in a repo by performing a check in finalize_repo_version. The newest (incoming) DistributionTree always wins.
All the current problems with Distribution Trees are due to the fact that they have a circular dependency from a Variant to a main repo a Distribution Tree belongs to. The main tree needs to be managed by user like a normal RPM repo, so Distribution Tree Varian and the main repo should be detached. It also solves problems with copy of a DistributionTree and a repo deletion.
Remove FK to the main repo from a distribution tree Variant.
No issues with repository removal. No issues with copying the same distribution tree into multiple repos.
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