refactor: remove obsolete member management API module

apps/web/supabase/migrations/20260416000005_member_versioning.sql

@@ -0,0 +1,31 @@
+-- =====================================================
+-- Optimistic Locking via Version Column
+--
+-- Problem: Two admins editing the same member silently
+-- overwrite each other's changes. Last write wins.
+--
+-- Fix: Add version column, auto-increment on update.
+-- API layer checks version match before writing.
+-- =====================================================
+
+-- Add version column
+ALTER TABLE public.members
+  ADD COLUMN IF NOT EXISTS version integer NOT NULL DEFAULT 1;
+
+-- Auto-increment version on every update
+CREATE OR REPLACE FUNCTION public.increment_member_version()
+RETURNS trigger
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = ''
+AS $$
+BEGIN
+  NEW.version := OLD.version + 1;
+  RETURN NEW;
+END;
+$$;
+
+CREATE TRIGGER trg_members_increment_version
+  BEFORE UPDATE ON public.members
+  FOR EACH ROW
+  EXECUTE FUNCTION public.increment_member_version();