1 files changed, 0 insertions, 45 deletions
diff --git a/db/post_migrate/20191115115522_migrate_epic_notes_mentions_to_db.rb b/db/post_migrate/20191115115522_migrate_epic_notes_mentions_to_db.rb
deleted file mode 100644
index 7914ff59dbd..00000000000
--- a/db/post_migrate/20191115115522_migrate_epic_notes_mentions_to_db.rb
+++ /dev/null
@@ -1,45 +0,0 @@
-# frozen_string_literal: true
-
-class MigrateEpicNotesMentionsToDb < ActiveRecord::Migration[5.2]
-  include Gitlab::Database::MigrationHelpers
-
-  DOWNTIME = false
-
-  disable_ddl_transaction!
-
-  DELAY = 2.minutes.to_i
-  BATCH_SIZE = 10000
-  MIGRATION = 'UserMentions::CreateResourceUserMention'
-
-  INDEX_NAME = 'epic_mentions_temp_index'
-  INDEX_CONDITION = "note LIKE '%@%'::text AND notes.noteable_type = 'Epic'"
-  QUERY_CONDITIONS = "#{INDEX_CONDITION} AND epic_user_mentions.epic_id IS NULL"
-  JOIN = 'INNER JOIN epics ON epics.id = notes.noteable_id LEFT JOIN epic_user_mentions ON notes.id = epic_user_mentions.note_id'
-
-  class Note < ActiveRecord::Base
-    include EachBatch
-
-    self.table_name = 'notes'
-  end
-
-  def up
-    return unless Gitlab.ee?
-
-    # create temporary index for notes with mentions, may take well over 1h
-    add_concurrent_index(:notes, :id, where: INDEX_CONDITION, name: INDEX_NAME)
-
-    Note
-      .joins(JOIN)
-      .where(QUERY_CONDITIONS)
-      .each_batch(of: BATCH_SIZE) do |batch, index|
-      range = batch.pluck(Arel.sql('MIN(notes.id)'), Arel.sql('MAX(notes.id)')).first
-      BackgroundMigrationWorker.perform_in(index * DELAY, MIGRATION, ['Epic', JOIN, QUERY_CONDITIONS, true, *range])
-    end
-  end
-
-  def down
-    # no-op
-    # temporary index is to be dropped in a different migration in an upcoming release:
-    # https://gitlab.com/gitlab-org/gitlab/issues/196842
-  end
-end