PLUTO-139 DB-health sweep follow-ups (from PLUTO-138, non-urgent): (1) verify practicas.idx_practicas_editlocked query path — drop if genuinely cold; (2) confirm userAuditLogLegacy table is retired → archival candidate (table+idx); (3) FK-usage audit: of 64 advisor-flagged unindexed FKs, identify which appear in live WHERE/JOIN (hot) vs audit/write-path (createdBy/deletedBy/archivedBy — leave cold), index only the hot ones via migration w/ archive-context. Don't index/drop blindly