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Review findings: - All 4 features (Slack alerts, reports, cohorts, NPS) fully implemented - 30+ tRPC endpoints with proper Zod validation - Clean service layer separation (services → router → endpoints) - Proper auth guards (protectedProcedure vs publicProcedure) - Database schemas properly defined with foreign keys and type inference - No new TypeScript errors introduced - Alert cooldown logic, severity mapping, and Slack block formatting verified - Cohort retention analysis and NPS calculation logic correct Assigning to Security Reviewer for final review. Co-Authored-By: Paperclip <noreply@paperclip.ing>