Add created_at to event_log_states table

ee/db/geo/migrate/20190802200655_add_created_at_to_event_log_states.rb

+# frozen_string_literal: true
+
+class AddCreatedAtToEventLogStates < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def up
+    add_column(:event_log_states, :created_at, :datetime, null: true)
+
+    # There should only be 1 record in the event_log_states table
+    execute('UPDATE event_log_states SET created_at = (
+      SELECT COALESCE(
+        (SELECT project_registry.created_at
+         FROM project_registry
+         ORDER BY project_registry.id ASC
+         LIMIT 1), NOW()
+      )
+    )')
+
+    change_column_null(:event_log_states, :created_at, false)
+  end
+
+  def down
+    remove_column(:event_log_states, :created_at)
+  end
+end

ee/db/geo/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_06_12_211021) do
+ActiveRecord::Schema.define(version: 2019_08_02_200655) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -29,6 +29,7 @@ ActiveRecord::Schema.define(version: 2019_06_12_211021) do
   end
 
   create_table "event_log_states", primary_key: "event_id", force: :cascade do |t|
+    t.datetime "created_at", null: false
   end
 
   create_table "file_registry", id: :serial, force: :cascade do |t|