add rfid_tag model

app/models/rfid_tag.rb

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

db/migrate/20250806151318_create_rfid_tags.rb

@@ -0,0 +1,11 @@
+class CreateRfidTags < ActiveRecord::Migration[8.0]
+  def change
+    create_table :rfid_tags do |t|
+      t.string :identifier
+      t.string :mode
+      t.index :identifier, unique: true
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,11 +10,19 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_07_07_090344) do
+ActiveRecord::Schema[8.0].define(version: 2025_08_06_151318) do
   create_table "moods", force: :cascade do |t|
     t.string "mode"
     t.datetime "recorded_at"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
   end
+
+  create_table "rfid_tags", force: :cascade do |t|
+    t.string "identifier"
+    t.string "mode"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["identifier"], name: "index_rfid_tags_on_identifier", unique: true
+  end
 end

test/fixtures/rfid_tags.yml

@@ -0,0 +1,9 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  identifier: MyString
+  mode: MyString
+
+two:
+  identifier: MyString
+  mode: MyString

test/models/rfid_tag_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class RfidTagTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end