Feature: Access tokens for API access (#604)

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/models/access_token.rb

@@ -0,0 +1,21 @@
+# == Schema Information
+#
+# Table name: access_tokens
+#
+#  id         :bigint           not null, primary key
+#  owner_type :string
+#  token      :string
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  owner_id   :bigint
+#
+# Indexes
+#
+#  index_access_tokens_on_owner_type_and_owner_id  (owner_type,owner_id)
+#  index_access_tokens_on_token                    (token) UNIQUE
+#
+
+class AccessToken < ApplicationRecord
+  has_secure_token :token
+  belongs_to :owner, polymorphic: true
+end