Cron vs. Queue: How Fintech SaaS Should Handle Shipment Data Cleanup

A technical analysis outlines best practices for managing data retention cleanup in fintech SaaS platforms that fan out shipment updates to multiple subscribers. The core recommendation separates latency-sensitive shipment delivery from policy-driven retention work, warning that sharing execution budgets between the two creates contention risks. For bounded, predictable cleanup tasks, a scheduled HTTP-triggered cron job is sufficient, provided the cutoff timestamp is computed and persisted at run start to ensure auditability. When a single tenant's data volume approaches execution limits or a failed batch should not restart the entire process, the guidance shifts to a queue-based model where cron triggers work distribution and separate workers handle execution. Throughout both approaches, the audit trail must remain unambiguous, meaning cutoff boundaries should never be silently recalculated mid-run.