Use 8 bytes value for event_id column on the geo_event_log_state table

db/geo/migrate/20170605154253_create_event_log_state.rb

 class CreateEventLogState < ActiveRecord::Migration
   def change
     create_table :event_log_states, id: false do |t|
-      t.primary_key :event_id, :bigserial
+      t.integer :event_id, limit: 8, primary_key: true
     end
   end
 end