FA-93312 / EV charging session scheduling / Member archive

Staggered start after tariff switch: latest start derivation · case 02

Charging is pulled forward even when the staggered start would still finish in time.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

To avoid a demand spike at a tariff switch each charger delays its start by delay = sum((i+1)*ord(c) for i, c in enumerate(cid)) % (max_delay+1) minutes after max(tariff_start, now). If that start is later than depart - dur it is pulled back to max(depart - dur, now). Status is 'ok' when start + dur <= depart else 'late'. Return [start, delay, status].

Why this case matters

Depot, workplace and public EV chargers schedule sessions against prices, circuit limits and departure deadlines; a wrong decision silently strands a driver or overloads a feeder.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: latest start derivation	`[109, 29, "ok"]`	`[138, 29, "ok"]`	Failed

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