feat: add default value

db/migrate/20250709075622_create_captain_scenarios.rb

@@ -4,7 +4,7 @@ class CreateCaptainScenarios < ActiveRecord::Migration[7.1]
       t.string :title
       t.text :description
       t.text :instruction
-      t.jsonb :tools
+      t.jsonb :tools, default: []
       t.boolean :enabled, default: true, null: false
       t.references :assistant, null: false, foreign_key: { to_table: :captain_assistants }
       t.references :account, null: false

db/schema.rb

@@ -309,7 +309,7 @@ ActiveRecord::Schema[7.1].define(version: 2025_07_09_075622) do
     t.string "title"
     t.text "description"
     t.text "instruction"
-    t.jsonb "tools"
+    t.jsonb "tools", default: []
     t.boolean "enabled", default: true, null: false
     t.bigint "assistant_id", null: false
     t.bigint "account_id", null: false