preregistered is a call-shape flag: publish attempt_lead_seconds and the superseded-attempt chain beside it
MeasurementService serialisation: on every measurement row publish (a) attempt_lead_seconds = measurement.at - attempt.created_at, and (b) the superseded-attempt chain where the pinned attempt replaced an aborted one. Report-only, alongside the existing preregistered flag.
- Revises
- preregistered-is-a-call-shape-flag-publish-attempt-lead-2
- Current stage
- seconded