ACCESS_EVENT
ACCESS_EVENT = 'event'
Access churn recorded as a compact login event.
The default. 48 bytes per event, 24% cheaper than a full field delta, and it keeps the security trail a rollback should never erase.
The shape of a site and the policy applied to it, as an estimate's input.
Two kinds of thing, deliberately in one object because an estimate is meaningless without both. The shape - users, nodes, rows, files - decides how much churn there is. The policy - flush interval, base interval, retention, whether files are captured at all - decides what that churn costs. A site twice the size on half the interval is not twice the bill.
Per-realm daily operation counts can be supplied directly. Left empty they are derived from the shape using the recorded per-subject rates, which is what the estimate form does. A calibration pass instead counts what the site actually wrote in the last day and passes those, which turns a projection into a back-test.