Mantiene la copertina YouTube se il telefono cade e avvia ffmpeg sul nodo, non via SSH.

Il relay HLS→RTMPS resta sul worker/agent del nodo assegnato, così tre dirette contemporanee restano in onda sul sito e sul canale della società senza schermo nero.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/models/youtube_credential.rb

@@ -4,19 +4,33 @@ class YoutubeCredential < ApplicationRecord
   attr_encrypted :access_token,
     key: :encryption_key,
     attribute: "access_token_encrypted",
-    mode: :single_iv_salt
+    mode: :single_iv_and_salt,
+    algorithm: "aes-256-cbc",
+    iv: :encryption_iv
   attr_encrypted :refresh_token,
     key: :encryption_key,
     attribute: "refresh_token_encrypted",
-    mode: :single_iv_salt
+    mode: :single_iv_and_salt,
+    algorithm: "aes-256-cbc",
+    iv: :encryption_iv
 
   def expired?
     expires_at.present? && expires_at < Time.current
   end
 
+  def usable?
+    refresh_token.present?
+  rescue ArgumentError, OpenSSL::Cipher::CipherError, NoMethodError
+    false
+  end
+
   private
 
   def encryption_key
     Rails.application.secret_key_base[0, 32]
   end
+
+  def encryption_iv
+    encryption_key[0, 16]
+  end
 end