ReadonlygametimeUnix timestamp in milliseconds when W3Booster observed the upgrade.
ReadonlylevelReadonlynameStandard-game upgrade rawcode.
ReadonlyprogressCompleted fraction, from 0 to 1; null when unreadable.
ReadonlyremainingRemaining game seconds, or null when unavailable.
ReadonlytotalPositive total game seconds, or null when unavailable.
A game-time snapshot. Null means unobserved/uninitialized; never advance on a wall clock.