test: clear mutex before each step

spec/jobs/webhooks/instagram_events_job_spec.rb

@@ -1,12 +1,16 @@
 require 'rails_helper'
 
-describe Webhooks::InstagramEventsJob, :serial do
+describe Webhooks::InstagramEventsJob do
   subject(:instagram_webhook) { described_class }
 
   before do
     stub_request(:post, /graph\.facebook\.com/)
     stub_request(:get, 'https://www.example.com/test.jpeg')
       .to_return(status: 200, body: '', headers: {})
+
+    # Clear Redis mutex key to prevent lock conflicts in parallel tests
+    mutex_key = format(Redis::Alfred::IG_MESSAGE_MUTEX, sender_id: 'Sender-id-1', ig_account_id: 'chatwoot-app-user-id-1')
+    Redis::Alfred.delete(mutex_key)
   end
 
   let!(:account) { create(:account) }