B2B-30: fix conflict in rpc function

supabase/migrations/20250630163951_alter_accounts_personal_code.sql

@@ -1,8 +1,27 @@
-ALTER TABLE public.accounts
-ADD CONSTRAINT accounts_personal_code_unique UNIQUE (personal_code);
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'accounts_personal_code_unique'
+  ) THEN
+    ALTER TABLE public.accounts
+    ADD CONSTRAINT accounts_personal_code_unique UNIQUE (personal_code);
+  END IF;
+END$$;
 
 ALTER TABLE public.invitations
 ALTER COLUMN personal_code TYPE text;
 
-ALTER TABLE public.invitations
-ADD CONSTRAINT invitations_personal_code_unique UNIQUE (personal_code);
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'invitations_personal_code_unique'
+  ) THEN
+    ALTER TABLE public.invitations
+    ADD CONSTRAINT invitations_personal_code_unique UNIQUE (personal_code);
+  END IF;
+END$$;
+