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Gemfile.lock

@@ -480,6 +480,10 @@ GEM
       erb
       psych (>= 4.0.0)
       tsort
+    redis (5.4.1)
+      redis-client (>= 0.22.0)
+    redis-client (0.29.0)
+      connection_pool
     regexp_parser (2.11.3)
     reline (0.6.3)
       io-console (~> 0.5)
@@ -647,6 +651,7 @@ DEPENDENCIES
   rack-cors
   rails (~> 8.1.1)
   rails-controller-testing
+  redis (~> 5.0)
   rqrcode
   rspec-its
   rspec-rails

config/initializers/mozo_settings.rb

@@ -16,4 +16,5 @@ Mozo.broadcaster = Mozo::Broadcaster::Faye.new
 # Counter: swap DrbCounter ↔ Redis
 #   Mozo::Counter.connection = Mozo::DrbCounter.object          # current (DRb in-memory)
 #   Mozo::Counter.connection = Mozo::Counter::Redis.new         # new (persistent, multi-process)
-Mozo::Counter.connection = Mozo::DrbCounter.object unless Rails.env.test?
+#Mozo::Counter.connection = Mozo::DrbCounter.object unless Rails.env.test?
+Mozo::Counter.connection = Mozo::Counter::Redis.new unless Rails.env.test?        # new (persistent, multi-process)

lib/mozo/counter/redis.rb

@@ -20,7 +20,7 @@ module Mozo
     class Redis
       def initialize(url: nil)
         require 'redis'
-        @redis = ::Redis.new(url: url || ENV.fetch('REDIS_URL', 'redis://localhost:6379/0'))
+        @redis = ::Redis.new(url: url || ENV.fetch('REDIS_URL', 'redis://localhost:6379/7'))
       end
 
       def get(key, options = {})