feat: add shared notification, communication, and export services for bookings, courses, and events; introduce btree_gist extension and new booking atomic function

apps/web/supabase/migrations/20260416000006_event_member_link.sql

@@ -21,12 +21,12 @@ CREATE INDEX IF NOT EXISTS ix_event_registrations_member
 -- Backfill: match existing registrations to members by email within the same account
 UPDATE public.event_registrations er
 SET member_id = m.id
-FROM public.events e
-JOIN public.members m ON m.account_id = e.account_id
+FROM public.events e, public.members m
+WHERE e.id = er.event_id
+  AND m.account_id = e.account_id
   AND lower(m.email) = lower(er.email)
   AND m.email IS NOT NULL AND m.email != ''
   AND m.status IN ('active', 'inactive', 'pending')
-WHERE e.id = er.event_id
   AND er.member_id IS NULL
   AND er.email IS NOT NULL AND er.email != '';
 
@@ -35,7 +35,7 @@ CREATE OR REPLACE FUNCTION public.transfer_member(
   p_member_id uuid,
   p_target_account_id uuid,
   p_reason text DEFAULT NULL,
-  p_keep_sepa boolean DEFAULT false
+  p_keep_sepa boolean DEFAULT true
 )
 RETURNS uuid
 LANGUAGE plpgsql