improvement: datepicker component now let user choose past dates too.

frontend/src/lib/api/appointments.ts

@@ -9,6 +9,8 @@ export interface CreateAppointmentBody {
   purpose: string;
 }
 
+export type UpdateAppointmentBody = Partial<CreateAppointmentBody>;
+
 export const appointmentsApi = {
   columnProviders: async (): Promise<{ success: boolean; data: AppointmentColumnProvider[] }> => {
     const response = await apiClient.get('/appointments/column-providers');
@@ -25,6 +27,14 @@ export const appointmentsApi = {
     return response.data;
   },
 
+  update: async (
+    id: string,
+    body: UpdateAppointmentBody,
+  ): Promise<{ success: boolean; data: AppointmentRecord }> => {
+    const response = await apiClient.patch(`/appointments/${id}`, body);
+    return response.data;
+  },
+
   remove: async (id: string): Promise<{ success: boolean }> => {
     const response = await apiClient.delete(`/appointments/${id}`);
     return response.data;