NoMethodError

What happened

• `duration` calls `member_program_statuses.first.start_date` with no nil check.
• The member program that crashed has no member_program_statuses rows (or no active one when `active?` is true).
• One such record in the serialized list fails the whole index request.
• There were 10 events from 3 users over 13 days. That fits a few bad records, not a deploy problem. The code on releases/master is unchanged.

What to do next

1. Code fix In app/models/member_program.rb, change MemberProgram#duration to return nil when no start date is found. Use `&.start_date` on both branches and `return unless start_date` before the subtraction.
2. Query Lists member programs with no status rows, which are the records that crash `duration`; check whether they are recent.

   SELECT mp.id, mp.status, mp.program_id, mp.created_at FROM member_programs mp LEFT JOIN member_program_statuses mps ON mps.member_program_id = mp.id GROUP BY mp.id HAVING COUNT(mps.id) = 0 ORDER BY mp.created_at DESC LIMIT 50;

Queries are shown, never run. Check them before using them on production.