Remove obsolete columns from resource_milestone_events

Release M+1

Remove obsolete columns from db/structure.sql

changelogs/unreleased/remove-obsolete-resource-milestone-events-columns.yml

+---
+title: Remove obsolete columns from resource_milestone_events
+merge_request: 28536
+author:
+type: other

db/post_migrate/20200401091051_remove_reference_columns_from_resource_milestone_events.rb

+# frozen_string_literal: true
+
+class RemoveReferenceColumnsFromResourceMilestoneEvents < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    remove_column :resource_milestone_events, :reference, :text
+    remove_column :resource_milestone_events, :reference_html, :text
+    remove_column :resource_milestone_events, :cached_markdown_version, :integer
+  end
+end

db/structure.sql

@@ -5597,9 +5597,6 @@ CREATE TABLE public.resource_milestone_events (
     milestone_id bigint,
     action smallint NOT NULL,
     state smallint NOT NULL,
-    cached_markdown_version integer,
-    reference text,
-    reference_html text,
     created_at timestamp with time zone NOT NULL
 );
 
@@ -13217,6 +13214,7 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200331132103
 20200331195952
 20200331220930
+20200401091051
 20200401095430
 20200401211005
 20200402123926