feat: implement subscription event sourcing with full audit trail (#175) - #516
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Smartdevs17 merged 2 commits intoJun 1, 2026
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feat: implement subscription event sourcing with full audit trail (#175)#516Smartdevs17 merged 2 commits into
Smartdevs17 merged 2 commits into
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- Add StoredEvent, EventFilter, EventRetentionPolicy, EventMetadata types - Add Charged/Downgraded variants to SubscriptionEventType - Implement EventStore with append-only event log using env.storage() - Implement state reconstruction (current + point-in-time) - Add event querying with filters (by subscription, by type, by date range) - Add event export for compliance reporting - Add configurable event retention policy with auto-pruning - Add event-related error variants (EventNotFound, EventStoreFull, etc.) - Instrument all lifecycle functions (subscribe, cancel, pause, resume, charge, refund, transfer, change_plan) to record events - Event sequence validation for legal state machine transitions
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…170 #169) Billing Schedules (#170): - Extend Interval enum with BiWeekly, BiMonthly, SemiAnnually, Custom(u64) - Add BillingSchedule struct with trial, promo rate, custom invoice day support - Add billing.rs module with next_billing, prorated_first_billing, preview - Add schedule storage per subscription - Add set/get_billing_schedule and get_billing_preview contract entry points Multi-step Charging with Retry (#169): - Add ChargeAttempt, ChargeStatus, RetryConfig types - Add charging.rs module with state machine (Pending→Attempting→Retrying→Completed/Exhausted) - Implement exponential backoff retry with configurable max retries - Add circuit breaker pattern to pause after repeated failures - Add charge history tracking per subscription - Add start_charge, retry_charge, get_charge_history, abort_charge entry points Fixes: - Fix proration.rs to use Interval::Yearly (was Annually, non-existent variant)
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…artdevs17#175) (Smartdevs17#516) * feat: implement subscription event sourcing with full audit trail (Smartdevs17#175) - Add StoredEvent, EventFilter, EventRetentionPolicy, EventMetadata types - Add Charged/Downgraded variants to SubscriptionEventType - Implement EventStore with append-only event log using env.storage() - Implement state reconstruction (current + point-in-time) - Add event querying with filters (by subscription, by type, by date range) - Add event export for compliance reporting - Add configurable event retention policy with auto-pruning - Add event-related error variants (EventNotFound, EventStoreFull, etc.) - Instrument all lifecycle functions (subscribe, cancel, pause, resume, charge, refund, transfer, change_plan) to record events - Event sequence validation for legal state machine transitions * feat: implement billing schedules and multi-step charging with retry (Smartdevs17#170 Smartdevs17#169) Billing Schedules (Smartdevs17#170): - Extend Interval enum with BiWeekly, BiMonthly, SemiAnnually, Custom(u64) - Add BillingSchedule struct with trial, promo rate, custom invoice day support - Add billing.rs module with next_billing, prorated_first_billing, preview - Add schedule storage per subscription - Add set/get_billing_schedule and get_billing_preview contract entry points Multi-step Charging with Retry (Smartdevs17#169): - Add ChargeAttempt, ChargeStatus, RetryConfig types - Add charging.rs module with state machine (Pending→Attempting→Retrying→Completed/Exhausted) - Implement exponential backoff retry with configurable max retries - Add circuit breaker pattern to pause after repeated failures - Add charge history tracking per subscription - Add start_charge, retry_charge, get_charge_history, abort_charge entry points Fixes: - Fix proration.rs to use Interval::Yearly (was Annually, non-existent variant)
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Closes #175
Closes #170
Closes #169
Summary
Implements an event sourcing architecture that records every subscription state change as an immutable on-chain event, enabling full audit trails, regulatory compliance, and historical state reconstruction.
Changes
Acceptance Criteria