ReadAnchoredTime shifted Item.LastMoved, Item.DecayResetTime and
Mobile.LastStr/Int/DexGain forward by the downtime at load. The bytes
were stable from save to save, but the first save after every restart
rewrote one timestamp in nearly every item record and most mobile
records, which defeats any per-record backup or delta save.
- LastMoved and DecayResetTime are read as saved. The downtime credit
is applied after load by Item.CreditDowntimeToDecay, which moves
DecayResetTime only for items whose decay countdown was still running
when the save started. Every other item keeps its bytes, and decay
timing is unchanged.
- World.LoadedSaveStartTime exposes the loaded save's anchor so the
credit can tell which countdowns were running.
- Stat-gain stamps are read raw. The cooldown is minutes long, so
downtime counting toward it costs nothing.
No format change: these fields were already absolute ticks.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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