test(server): reproduce unused correlation index (issue #20534)

Tests reproduce issue 20534: a fully migrated database still carries
idx_orch_events_correlation_id, which no query uses.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
5dedf455d1Julius Marminge committed on 10/21/2026, 10:45:35 PMparent70e5e38
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