fix: resolve issues #676, #677, #678, #679

[Mathews-25]

closes #676
closes #677
closes #678
closes #679

#676 - Goal Milestone Detection Async Queue

• Add MilestoneQueueService with in-process async queue (batches of 10, 500ms flush interval) replacing fire-and-forget loop in findMyGoals
• Retry logic: up to 3 attempts with exponential backoff (2s * attempt)
• Emits milestone.batch.achieved and milestone.detection.failed events
• Register MilestoneQueueService in SavingsModule

#677 - Product Capacity Race Condition Fix

• Wrap subscribe() in DataSource.transaction() with SELECT FOR UPDATE pessimistic write lock on the product row
• All capacity checks (count, amount) run inside the locked transaction
• Add @VersionColumn() to UserSubscription for optimistic locking
• Add migration 1800000000000-AddVersionToUserSubscriptions

#678 - Withdrawal Fraud Detection

• Add WithdrawalFraudService with velocity checks (5 req/hr, 50k/day), cooling-off period (30 days, max 5k), large-amount flagging (>=10k), and suspicious pattern detection (repeated similar amounts in 30min)
• Emits withdrawal.fraud.flagged event for monitoring
• Integrate into AdminWithdrawalService.approve(): HIGH risk blocks with ForbiddenException; MEDIUM+large routes to manual review queue
• Register WithdrawalFraudService in AdminModule

#679 - Compound Interest Calculation Fix

• Replace simple interest with compound interest formula A=P(1+r/n)^(nt)
• Add CompoundingFrequency enum (DAILY/WEEKLY/MONTHLY/QUARTERLY/ANNUALLY/ CONTINUOUS) configurable via SAVINGS_COMPOUNDING_FREQUENCY env var
• Support continuous compounding via e^(rt) when frequency=0
• Register InterestCalculationService and InterestHistory in SavingsModule
• Expose savings.compoundingFrequency in configuration.ts

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
nestera	Skipped		Apr 29, 2026 8:51am

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