fix(migration): Service account creator nullable if creator is deleted

Author: hamir-suspect

github_hooks/db/migrate/20250718124232_create_service_accounts.rb

@@ -3,7 +3,7 @@ def change
     create_table :service_accounts, id: false do |t|
       t.uuid :id, primary_key: true, null: false
       t.string :description
-      t.uuid :creator_id, null: false
+      t.uuid :creator_id
     end
 
     add_foreign_key :service_accounts, :users, column: :id, on_delete: :cascade

guard/priv/front_repo/migrations/20250716010415_create_service_accounts.exs

@@ -3,11 +3,10 @@ defmodule Guard.FrontRepo.Migrations.CreateServiceAccounts do
 
   def change do
     create table(:service_accounts, primary_key: false) do
-      add :id, references(:users, type: :binary_id, on_delete: :delete_all), 
+      add :id, references(:users, type: :binary_id, on_delete: :delete_all),
           primary_key: true, null: false
       add :description, :string, size: 500
-      add :creator_id, references(:users, type: :binary_id, on_delete: :nilify_all), 
-          null: false
+      add :creator_id, references(:users, type: :binary_id, on_delete: :nilify_all)
     end
   end
-end
+end