RemoveEvents: Save less events

We have went over the row limit again. This is probably fine to save
less data.

lib/tasks/remove_events.rb

@@ -1,17 +1,18 @@
 class RemoveEvents
   method_object
 
+  LIMIT = 4.months.ago
+
   def call
     destroy_events_older_than_the_limit
   end
 
   private
 
   def destroy_events_older_than_the_limit
-    limit = 5.months.ago
     # We have no associated relations so we can use delete_all
-    number_of_events_deleted = Event.where("created_at < ?", limit).delete_all
+    number_of_events_deleted = Event.where("created_at < ?", LIMIT).delete_all
     EventsData.instance.decrement!(:total_events, number_of_events_deleted)
-    puts "Deleted events older than #{limit}"
+    puts "Deleted events older than #{LIMIT}"
   end
 end

spec/lib/tasks/remove_events_spec.rb

@@ -4,7 +4,7 @@
 describe RemoveEvents, ".call" do
   it "removes data older than the limit and updates total events" do
     # No need for the logging output in the test
-    limit = 5.months.ago
+    limit = RemoveEvents::LIMIT
     allow_any_instance_of(RemoveEvents).to receive(:puts)
 
     event_older_than_the_limit = create_event_at(limit - 1.second)