A start logged within one period before an existing start folds that start
into itself and soft-deletes it, since the two are one period entered out of
order. Nothing recorded which start was folded, so taking the earlier start
back could not bring the later one back: a mis-tap on the 5th with a real
start on the 10th, then deleted, left the 10th gone and the cycle before it
reopened.
Migration 0345 adds menstrual_cycles.absorbed_into_id. The folded row names
the start that absorbed it; removing that start restores it, re-derives its
own end and hands its days back to it. The column is needed because a
soft-deleted row alone cannot tell a folded start from one the person
deleted, and the audit trail is not state a removal can read. Deleting a
cycle directly now runs the same shared removal as deleting its day-log.
Opening a cycle closes the one before it: the start write stamps the
previous cycle's endDate and lengthDays, and a back-filled start takes
its own end from its successor. Nothing undid any of that. Deleting the
start left the previous cycle as a closed torso holding an end date from
a cycle that no longer existed, and a record whose last cycle is closed
has no open cycle to forecast from — the prediction went away and there
was no way to bring it back from the app.
Both removal paths now re-derive the boundary from the cycles that
remain: a cycle ends the day before the next one begins, and with no
next one it is open again. That is a re-derivation rather than an undo
log, so it is correct for a history that came from an import or a
restore, and running it twice changes nothing the second time.
Deleting the day-log that opened a cycle now removes that cycle too.
The one-tap start writes both rows and the log sheet's delete is the
only way the web offers to take it back; leaving the cycle standing was
how the broken state survived the undo.
- soft-delete and re-anchor run in one transaction
- the audit row names the neighbour's moved boundary, the only part of
the write the tombstone cannot reconstruct
- round trip through the real routes: photograph the cycle rows, log the
start, remove it either way, compare field by field — including that
the forecast comes back
Marc-André Bombeck