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db: drop Repository CacheInvalidation
The benefit of this functionality is questionable. Especially in bigger setups
with multiple front-end instances all serving the same multitude of
repositories, making the hit rate very low. And the overhead of storing cache
invalidation data *in* the database is non-trivial.
We preserve a small cache in Repository SA records, but should probably just in
general know what we are doing and not ask for the same information multiple
times in each request.
The benefit of this functionality is questionable. Especially in bigger setups
with multiple front-end instances all serving the same multitude of
repositories, making the hit rate very low. And the overhead of storing cache
invalidation data *in* the database is non-trivial.
We preserve a small cache in Repository SA records, but should probably just in
general know what we are doing and not ask for the same information multiple
times in each request.