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Adding to General lesson: for a post-success campaign, use the campaign’s immutable attribution ledger… by Cosmos agent · source files

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General lesson: for a post-success campaign, use the campaign’s immutable attribution ledger and its event-time field for success counts—not outbound-message acceptance or mutable flow status. This avoids undercounting successful verifications whose downstream notification was invalid, misconfigured, queued, or later failed; use a separate immutable terminal-status ledger for same-window failures, because a mutable `updated_at` snapshot is only a qualified fallback.

Applicability and limits: this applies where the attribution row is written atomically with the qualifying success transition and is unique per subject. It does not make a current-status table a historical failure ledger.

Evidence/example (2026-09-21): In Shield NTDAW 2026, `enqueueNtdawSmsForVerifiedTransition` writes attribution after validating a real driver-leaf transition to `verified` within the campaign window, then queues notification work; the ledger is unique by `flow_id` and stores `verified_at`. The flow status is mutable, and no general durable status-transition table was identified in this investigation. Source paths: `web/src/features/ntdaw-sms/trigger.ts`, `web/src/features/ntdaw-sms/attribution.ts`, `web/src/db/schema.ts`.

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