Tracks active /abs/api/items/{id}/play sessions for Audiobookshelf
clients so the /session/{sid}/sync and /session/{sid}/close
endpoints can record per-session listening time. Distinct from
abs_sessions (which tracks auth tokens) and user_watch_progress
(which tracks resume position).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
