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Marc-André Bombeck
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The register said the originating device may still hold them. That holds for about as long as the phone beside the watch does, and not at all once a Withings connection is revoked: the signal id stops resolving with it. So a self-hoster who exported and wiped had a file with no traces in it and a restore that reported success. Both ends live in src/lib/export/ecg-backup.ts, the arrangement the reminders, visits and Coach sections already use. Three things needed deciding. The waveform follows the note contract: ciphertext verbatim in a disaster-recovery payload, the micro-volt samples decrypted in a portable one. There is no placeholder for a strip that will not decrypt the way the Coach has one for a turn, because waveformEncrypted is a required column. Such a recording is left out of a portable file with a warning on the wide event, so the number of strips in the file is the number of strips that can be shown. measurementId is a REAL foreign key against the event row a strip was filed with, unlike the Coach references next door. A value that will not resolve does not dangle quietly here, it violates the constraint and rolls the whole restore back over one cross-reference. A portable export omits soft-deleted measurements, so that case is reachable rather than theoretical. The reference is resolved against the measurements the restore wrote, nulled when it cannot be, and reported as ecgReference. The strips are wiped and rewritten by the section itself. The wipe at the top of the restore never reached them: a recording hangs off the account, not off a measurement, so deleting the measurements only nulled the pointer and left the row behind. The round trip asserts the row column by column rather than counting it. A recording is three things at once and each is the whole value of the row on its own: a strip with no rhythm verdict is a squiggle nobody has read, a strip with no recordedAt belongs to no day, and a strip with no samples is a claim that an ECG exists which nothing can draw.