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  "limitations": [
    "The first profile ran as postgres with auth claims; the subsequent role/transaction comparison preserved both authenticated and postgres results.",
    "Nested-plan collection first failed because postgres cannot LOAD auto_explain; its follow-up missed the before window. Both failures remain. The final paired capture uses supabase_admin to load instrumentation, then authenticated for actual RPC calls.",
    "Nested plan durations include instrumentation and one call per condition; they are not p95 values. Controlled twenty-call distributions are in the separate statistics-diagnosis artifact.",
    "Fixed-fixture ANALYZE preparation time and cluster WAL are separate costs. Cluster WAL can include concurrent activity."
  ]
}