1 files changed, 33 insertions, 0 deletions
diff --git a/db/post_migrate/20220420214703_schedule_backfill_draft_status_on_merge_requests_corrected_regex.rb b/db/post_migrate/20220420214703_schedule_backfill_draft_status_on_merge_requests_corrected_regex.rb
new file mode 100644
index 00000000000..1001aca583b
--- /dev/null
+++ b/db/post_migrate/20220420214703_schedule_backfill_draft_status_on_merge_requests_corrected_regex.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class ScheduleBackfillDraftStatusOnMergeRequestsCorrectedRegex < Gitlab::Database::Migration[1.0]
+  INDEX_NAME = "tmp_index_merge_requests_draft_and_status"
+  MIGRATION = "BackfillDraftStatusOnMergeRequestsWithCorrectedRegex"
+  DELAY_INTERVAL = 2.minutes
+  BATCH_SIZE = 50
+  CORRECTED_REGEXP_STR = "^(\\[draft\\]|\\(draft\\)|draft:|draft|\\[WIP\\]|WIP:|WIP)"
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :merge_requests, :id,
+      where: "draft = false AND state_id = 1 AND ((title)::text ~* '#{CORRECTED_REGEXP_STR}'::text)",
+      name: INDEX_NAME
+
+    eligible_mrs = MergeRequest.where(state_id: 1)
+    .where(draft: false)
+    .where("title ~* ?", "#{CORRECTED_REGEXP_STR}")
+
+    queue_background_migration_jobs_by_range_at_intervals(
+      eligible_mrs,
+      MIGRATION,
+      DELAY_INTERVAL,
+      track_jobs: true,
+      batch_size: BATCH_SIZE
+    )
+  end
+
+  def down
+    remove_concurrent_index_by_name :merge_requests, INDEX_NAME
+  end
+end