1 files changed, 38 insertions, 0 deletions
diff --git a/db/post_migrate/20201112130710_schedule_remove_duplicate_vulnerabilities_findings.rb b/db/post_migrate/20201112130710_schedule_remove_duplicate_vulnerabilities_findings.rb
new file mode 100644
index 00000000000..d05516bd255
--- /dev/null
+++ b/db/post_migrate/20201112130710_schedule_remove_duplicate_vulnerabilities_findings.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+class ScheduleRemoveDuplicateVulnerabilitiesFindings < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  INDEX_NAME = 'tmp_idx_deduplicate_vulnerability_occurrences'
+
+  MIGRATION = 'RemoveDuplicateVulnerabilitiesFindings'
+  DELAY_INTERVAL = 2.minutes.to_i
+  BATCH_SIZE = 5_000
+
+  disable_ddl_transaction!
+
+  class VulnerabilitiesFinding < ActiveRecord::Base
+    include ::EachBatch
+    self.table_name = "vulnerability_occurrences"
+  end
+
+  def up
+    add_concurrent_index :vulnerability_occurrences,
+      %i[project_id report_type location_fingerprint primary_identifier_id id],
+      name: INDEX_NAME
+
+    say "Scheduling #{MIGRATION} jobs"
+    queue_background_migration_jobs_by_range_at_intervals(
+      VulnerabilitiesFinding,
+      MIGRATION,
+      DELAY_INTERVAL,
+      batch_size: BATCH_SIZE
+    )
+  end
+
+  def down
+    remove_concurrent_index_by_name(:vulnerability_occurrences, INDEX_NAME)
+  end
+end