Delete the cache entries before backfilling again if cache is incoherent (inexisting config or split names)
fixes #2767.

Hopefully, applying this to production will delete a lot of obsolete cache entries after the next backfill
Delete the cache entries before backfilling again if cache is incoherent (inexisting config or split names): fixes #2767.

Hopefully, applying this to production will delete a lot of obsolete cache entries after the next backfill