API endpoint to update reservation check-in times

Problem statement:

• Hosts with automated systems that detect late-arriving guests (e.g., via message parsing) cannot programmatically update the reservation check-in time via the Public API
• The API currently only supports reading check-in times, not writing to them

Current workaround:

• Hosts must manually update check-in times in the Hospitable Inbox or Calendar UI for each reservation
• This requires human intervention even when the late arrival is detected automatically by external systems

Impact:

• Automation workflows that depend on accurate check-in times (e.g., smart lock codes, guest messaging, cleaning schedules) cannot respond correctly without manual updates
• Increased operational overhead for hosts managing multiple properties
• Delayed or incorrect guest communication when check-in times are not updated promptly

Proposed solution:

• Add a PUT or PATCH endpoint to the Public API (e.g., PUT /v2/reservations/{id}) that allows updating the check-in time for a specific reservation
• This would mirror the existing UI functionality where hosts can adjust check-in times per booking

Unlock:

• Hosts could fully automate late-arrival handling, ensuring downstream systems (smart locks, messaging, cleaning tasks) respond correctly without manual intervention
• Reduced manual workload and improved guest experience through timely, accurate updates