Add webauthn

db/migrate/20251104042206_add_webauthn_to_users.rb

@@ -0,0 +1,16 @@
+class AddWebauthnToUsers < ActiveRecord::Migration[8.1]
+  def change
+    # WebAuthn user handle - stable, opaque identifier for the user
+    # Must be unique and never change once assigned
+    add_column :users, :webauthn_id, :string
+    add_index :users, :webauthn_id, unique: true
+
+    # Policy enforcement - whether this user MUST use WebAuthn
+    # Can be set by admins for high-security accounts
+    add_column :users, :webauthn_required, :boolean, default: false, null: false
+
+    # User preference for 2FA method (if both TOTP and WebAuthn are available)
+    # :totp, :webauthn, or nil for system default
+    add_column :users, :preferred_2fa_method, :string
+  end
+end