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app/models/device.rb

@@ -43,7 +43,7 @@ class Device < ApplicationRecord
     logs
       .order(created_at: :desc)
       .offset((max_log_count || DEFAULT_MAX_LOGS) * multiplier)
-      .delete_all
+      .destroy_all
   end
 
   def self.current

db/migrate/20180330143232_migrate_away_from_meta_column.rb

@@ -1,7 +1,7 @@
 class MigrateAwayFromMetaColumn < ActiveRecord::Migration[5.1]
   def up
     Device.all.map do |d|
-      d.trim_log_list!(5)
+      d.trim_log_list!(2)
     end
   end