More debugging

lib/timber/current_context.rb

@@ -6,7 +6,7 @@ module Timber
   class CurrentContext
     class ContextAlreadyAddedError < StandardError
       def initialize(context)
-        super("Context of type #{context.class.name} has already been added")
+        super("Context of type #{context.class.name} has already been added: #{context.as_json.inspect}")
       end
     end
 

lib/timber/probes/active_support_log_subscriber/active_record.rb

@@ -3,6 +3,7 @@ module Probes
     class ActiveSupportLogSubscriber < Probe
       module ActiveRecord
         def self.sql(log_subscriber, event, &_block)
+          Config.logger.warn("Adding sql context for #{event.payload[:sql]}")
           context1 = Contexts::SQLQueries::ActiveRecord.new(log_subscriber, event)
           context2 = Contexts::SQLQueries::ActiveRecordSpecific.new(log_subscriber, event)
           CurrentContext.add(context1, context2) { yield }