Add plan-level quota reset periods and display/reset cadence in admin/UI
Enforce natural reset alignment with background reset task and cleanup job
Make subscription pre-consume/refund idempotent with request-scoped records and retries
Use database time for consistent resets across multi-instance deployments
Harden payment callbacks with locking and idempotent order completion
Record subscription purchases in topup history and billing logs
Optimize subscription queries and add critical composite indexes