Add parks_by_state model

app/models/parks_by_state.rb

@@ -0,0 +1,2 @@
+class ParksByState < ApplicationRecord
+end

db/migrate/20251008150542_create_parks_by_states.rb

@@ -0,0 +1,14 @@
+class CreateParksByStates < ActiveRecord::Migration[8.0]
+  def change
+    create_table :parks_by_states do |t|
+      t.string :park_code, null: false
+      t.string :state, null: false
+
+      t.timestamps
+    end
+
+    add_index :parks_by_states, [:state, :park_code], unique: true
+    add_index :parks_by_states, :park_code
+    add_foreign_key :parks_by_states, :parks, column: :park_code, primary_key: :code
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_10_08_063847) do
+ActiveRecord::Schema[8.0].define(version: 2025_10_08_150542) do
   create_table "alerts", force: :cascade do |t|
     t.string "category", null: false
     t.text "description"
@@ -35,5 +35,15 @@ ActiveRecord::Schema[8.0].define(version: 2025_10_08_063847) do
     t.index ["code"], name: "index_parks_on_code", unique: true
   end
 
+  create_table "parks_by_states", force: :cascade do |t|
+    t.string "park_code", null: false
+    t.string "state", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["park_code"], name: "index_parks_by_states_on_park_code"
+    t.index ["state", "park_code"], name: "index_parks_by_states_on_state_and_park_code", unique: true
+  end
+
   add_foreign_key "alerts", "parks", column: "park_code", primary_key: "code"
+  add_foreign_key "parks_by_states", "parks", column: "park_code", primary_key: "code"
 end

spec/models/parks_by_state_spec.rb

@@ -0,0 +1,4 @@
+require 'rails_helper'
+
+RSpec.describe ParksByState, type: :model do
+end