Deleting a workout is reversible (for 30 days)

The shape

When you delete a workout from the calendar (Coach calendar → right-click pill → Delete, or from the workout detail page), the Hub does NOT immediately remove the row. Instead:

1. The workout's deleted_at field is set to the current time.
2. It disappears from every calendar view, compliance report, PMC chart, and load aggregate.
3. A toast appears: "Workout deleted — undo".

Undoing a delete

• Within the same browser session: click undo on the toast. The workout pops back into the calendar instantly.
• After the session is closed but within 30 days: a coach with admin tier can restore from Django admin (/admin/core/scheduledworkout/, filter on deleted_at is not null). Open the row and clear deleted_at. Future versions will surface this as a "Recently deleted" view in the coach UI.

What permanent deletion looks like

Once a workout has been soft-deleted for 30 days, the purge_deleted_workouts cron command hard-deletes the row in its next nightly run. After that point the workout is gone for good — restore isn't possible.

The cron also cleans up dangling workout-note threads (those belonging to the purged workout).

What survives a delete

Even after soft-delete:

• Uploaded activity (if the workout was auto-matched to one) stays untouched. Activities are not soft-deleted alongside the workout — they're the athlete's record of what they actually did.
• Workout-note thread stays for the soft-delete window so the audit trail is intact. It is cleaned up by the same cron after 30 days.

What gets affected immediately

• Compliance overlay for that week recalculates (the planned hours / load go down).
• PMC (Fitness / Fatigue / Form) recalculates that day's planned load contribution at next aggregate refresh.
• Templates and plans the workout was created from are not affected — the template is its own entity.

Why we do it this way

Hard-deleting on the first click would make calendar editing scary (misclicks erase work). Soft-deleting with a fast undo, a 30-day recovery window, and a clean nightly purge gives us safe-by-default without permanent clutter.