Tidy up homepage and navigation

app/models/dsn.rb

@@ -0,0 +1,18 @@
+class Dsn < ApplicationRecord
+  validates :key, presence: true, uniqueness: true
+  validates :name, presence: true
+
+  before_validation :generate_key, on: :create
+
+  scope :enabled, -> { where(enabled: true) }
+
+  def self.authenticate(key)
+    enabled.find_by(key: key)
+  end
+
+  private
+
+  def generate_key
+    self.key ||= SecureRandom.hex(32)
+  end
+end