1. Write the required interval
For each child and day, state when an adult must actually be responsible. Allow different hours by weekday.
2. Count only explicit coverage
A parent being at home, on leave or remote-working counts only when they explicitly accept the care interval.
3. Merge confirmed blocks
Merge overlaps and adjacent intervals before subtraction. Keep cancelled, rejected and waitlisted options out of confirmed coverage.
4. Classify every remaining interval
Look for a gap at the start, between solutions, at the end or across the whole day. Then check pickup responsibility and incompatible locations.
5. Repeat after every change
A cancellation or changed end time can reopen a solved day. Preserve audit history so collaborators understand why.
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