- Group = trainer + type (time-independent) - Edit modal shows per-day time fields (Mon 12:00, Fri 18:00) - Calendar blocks colored by group, not class type - Color picker for site dots moved to classes editor - New class: single time + multi-day selector - Edit class: per-day times, add/remove days from group - Delete removes group from all days Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>