User clarified: the earlier prune was a ONE-TIME cleanup of an over-backfill bug, NOT a recurring retention cap. Saved history must persist. Removed cmd_prune / --prune-older-than-hours entirely; the script now only captures forward (default) or seeds a bounded window once. No code path deletes cube entries. Verified: help has no prune arg, forward/seed dry-runs change no state, live timer runs forward-only.