Jared Vititoe 13f0fab138 Fix avg resolution time using dedicated closed_at column ...

The dashboard's "Avg Resolution" stat was using updated_at, which gets
overwritten on any post-close edit (title change, comment, etc.),
inflating the metric. Also fixes "Closed Today" count for the same reason.

- Add closed_at TIMESTAMP column to tickets table
- Set closed_at on close, preserve on re-edit, clear on reopen
- Update StatsModel queries to use closed_at instead of updated_at
- Add migration script with audit log backfill for existing tickets

Run: php scripts/add_closed_at_column.php

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-11 14:59:35 -05:00

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