The coach's effective availability and which source governs it. source: 'manual' — no active GHL mapping, weeklyHours reconstructed from the tables above. source: 'ghl' — an active coaching_1on1 mapping; weeklyHours is always [] (GHL's real availability has no reconstructable weekly-hours shape once you account for personal/round-robin calendar types), upcomingSlots carries the next real bookable windows instead. Additive: GET working-hours is unchanged and stays the source for the fallback path.