1 files changed, 28 insertions, 0 deletions
diff --git a/db/post_migrate/20220505174658_update_index_on_alerts_to_exclude_null_fingerprints.rb b/db/post_migrate/20220505174658_update_index_on_alerts_to_exclude_null_fingerprints.rb
new file mode 100644
index 00000000000..5cffdb641d6
--- /dev/null
+++ b/db/post_migrate/20220505174658_update_index_on_alerts_to_exclude_null_fingerprints.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class UpdateIndexOnAlertsToExcludeNullFingerprints < Gitlab::Database::Migration[2.0]
+  disable_ddl_transaction!
+
+  OLD_INDEX_NAME = 'index_partial_am_alerts_on_project_id_and_fingerprint'
+  NEW_INDEX_NAME = 'index_unresolved_alerts_on_project_id_and_fingerprint'
+
+  def up
+    add_concurrent_index :alert_management_alerts,
+      [:project_id, :fingerprint],
+      where: "fingerprint IS NOT NULL and status <> 2",
+      name: NEW_INDEX_NAME,
+      unique: true
+
+    remove_concurrent_index_by_name :alert_management_alerts, OLD_INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :alert_management_alerts,
+      [:project_id, :fingerprint],
+      where: "status <> 2",
+      name: OLD_INDEX_NAME,
+      unique: true
+
+    remove_concurrent_index_by_name :alert_management_alerts, NEW_INDEX_NAME
+  end
+end