Major competitive-parity release — the pricing, usage, subscription-lifecycle and analytics breadth the mature commercial products have.
- Pricing models: graduated / volume / package / stairstep tiers (
PricingModel+PriceTier+ a remainder-safeTierCalculator), alongside flat / per-unit. - Billable-metric aggregations:
Count / Sum / Max / UniqueCount / Latest / WeightedSumviaEventLog::aggregate()(in-memory + database), composed usage→quantity→tiered-price. - Subscription depth: free trials, a first-class state machine (
Trialing / Active / PastDue / Paused / NonRenewing / Canceled, deny-by-default transitions), ramp deals, and minimum commitments + true-up. - Reporting depth: MRR movement waterfall (new/expansion/contraction/churn/reactivation, identity-checked), NRR/GRR, cohort retention matrix, and ARR waterfall — exact minor-unit math.
Additive/backward-compatible (new enum cases, trailing-optional VO params, an additive migration). 372 tests. Consumers on ^0.7 should widen to allow ^0.8.