server: Fix fine-grained incremental cache invalidation (fix #3759) #6027
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Description
This fixes issue #3759, a long-standing bug which could cause the values of enum tables to not get refreshed even when an explicit reload is triggered by clicking “Reload enum values” in the console or making a
reload_metadataAPI call.Affected components
Related Issues
#3759
Solution and Design
This issue was very tricky to track down, but fortunately easy to fix. The interaction here is subtle enough that it’s difficult to put into English what would go wrong in what circumstances, but the new unit test captures precisely that interaction to ensure it remains fixed.
Server checklist
This PR includes no breaking changes.