Drop the obsolete idx_code_code_first_75 index - #2937
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The similarity query of server 4.0.0 reads compiled_contracts_runtime_code_prefixes; the old prefix index on the code table was kept only as rollback insurance and is verified obsolete in production. Frees 1.1 GB.
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kuzdogan
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TODO: Run on staging |
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TODO 2: Find a naming convention to mark this has a todo for release time. Potentially if the release script finds the naming convention like |
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Follow-up to #2918 (see #2891): drops
idx_code_code_first_75on thecodetable.Server 4.0.0 finds similarity candidates through the
compiled_contracts_runtime_code_prefixesside table. The old prefix index served only the pre-4.0.0 query and was kept as rollback insurance. The new query is now verified on production: worst-case candidate search (prefix shared by ~102k compilations) runs in 75 ms, typical cold lookups in ~156 ms, batch payload fetch in ~94 ms.The index takes 1.1 GB on production. The drop is instant; the
migrate:downrecreation scans the wholecodetable and takes several minutes.Notes
migrate:downfirst (recreates the index).