Remove column as needed

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20190403161806) do
+ActiveRecord::Schema.define(version: 20190404231137) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1361,7 +1361,6 @@ ActiveRecord::Schema.define(version: 20190403161806) do
     t.text "selective_sync_shards"
     t.integer "verification_max_capacity", default: 100, null: false
     t.integer "minimum_reverification_interval", default: 7, null: false
-    t.string "alternate_url"
     t.string "internal_url"
     t.index ["access_key"], name: "index_geo_nodes_on_access_key", using: :btree
     t.index ["primary"], name: "index_geo_nodes_on_primary", using: :btree

ee/db/post_migrate/20190404231137_remove_alternate_url_from_geo_nodes.rb

+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+# We are reverting the feature that created this column. This is for anyone who
+# migrated while the feature still existed in master.
+class RemoveAlternateUrlFromGeoNodes < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  def up
+    remove_column(:geo_nodes, :alternate_url) if column_exists?(:geo_nodes, :alternate_url)
+  end
+
+  def down
+    add_column :geo_nodes, :alternate_url, :string
+  end
+end