Filter array items

I need to remove inactive users from an array before sending notifications. Filter the users array to include only those with isActive true and a lastSeen timestamp within the past 90 days. Return the filtered array ready for the notifications job.

Before the notifications run tonight, make the filter easy to audit. Put the final count comment above the snippet, show the filter condition clearly (isActive and lastSeen window), and flag edge cases like missing lastSeen or clock skew. Keep the code short and explicit so an operations reviewer can verify it quickly.

I just filtered users but notifications still went to accounts marked inactive. The operations manager, Lee, is upset. I’m uncertain whether lastSeen was missing or the isActive flag is inconsistent in the DB. What’s the most likely reason and the immediate safe fix to prevent more unwanted notifications tonight?

We keep having mismatched filter criteria between the API, the worker, and the analytics job, so reports and jobs disagree on who is active. It undermines trust and causes repeated firefights. Which single pattern will stop this — a shared utility function, schema-enforced user state, or documented business rule in a central place? Recommend the change and how to get the team to adopt it.