Use 8 bytes for the push_event_id foreign key on geo_event_log table

db/migrate/20170522201800_create_geo_event_log.rb

@@ -4,7 +4,7 @@ class CreateGeoEventLog < ActiveRecord::Migration
   def change
     create_table :geo_event_log, id: :bigserial do |t|
       t.datetime :created_at, index: true, null: false
-      t.integer :push_event_id, index: true
+      t.integer :push_event_id, limit: 8, index: true
 
       t.foreign_key :geo_push_events, column: :push_event_id, on_delete: :cascade
     end

db/schema.rb

@@ -502,7 +502,7 @@ ActiveRecord::Schema.define(version: 20170602003304) do
 
   create_table "geo_event_log", id: :bigserial, force: :cascade do |t|
     t.datetime "created_at", null: false
-    t.integer "push_event_id"
+    t.integer "push_event_id", limit: 8
   end
 
   add_index "geo_event_log", ["created_at"], name: "index_geo_event_log_on_created_at", using: :btree