1 files changed, 35 insertions, 0 deletions
diff --git a/db/post_migrate/20200511092714_update_undefined_confidence_from_vulnerabilities.rb b/db/post_migrate/20200511092714_update_undefined_confidence_from_vulnerabilities.rb
new file mode 100644
index 00000000000..d6611ddbd66
--- /dev/null
+++ b/db/post_migrate/20200511092714_update_undefined_confidence_from_vulnerabilities.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class UpdateUndefinedConfidenceFromVulnerabilities < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  INDEX_NAME = 'index_vulnerability_on_id_and_confidence_eq_zero'
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+  BATCH_SIZE = 1_000
+  INTERVAL = 2.minutes
+
+  # 87_602 records to be updated on GitLab.com
+  def up
+    # create temporary index for undefined vulnerabilities
+    add_concurrent_index(:vulnerabilities, :id, where: 'confidence = 0', name: INDEX_NAME)
+
+    return unless Gitlab.ee?
+
+    migration = Gitlab::BackgroundMigration::RemoveUndefinedVulnerabilityConfidenceLevel
+    migration_name = migration.to_s.demodulize
+    relation = migration::Vulnerability.undefined_confidence
+    queue_background_migration_jobs_by_range_at_intervals(relation,
+                                                          migration_name,
+                                                          INTERVAL,
+                                                          batch_size: BATCH_SIZE)
+  end
+
+  def down
+    # no-op
+    # temporary index is to be dropped in a different migration in an upcoming release
+    remove_concurrent_index(:vulnerabilities, :id, where: 'confidence = 0', name: INDEX_NAME)
+    # This migration can not be reversed because we can not know which records had undefined confidence
+  end
+end