Merge ~cjwatson/launchpad:merge-db-stable into launchpad:master

[Colin Watson]

Merge db-stable d74fff3384 (Add default traversal columns to Distribution)

[Colin Watson (cjwatson)]

Deployed to the production database today.

review: Approve

diff --git a/database/schema/patch-2210-23-0.sql b/database/schema/patch-2210-23-0.sql
new file mode 100644
index 0000000..d1db911
--- /dev/null
+++ b/database/schema/patch-2210-23-0.sql
@@ -0,0 +1,11 @@
+-- Copyright 2020 Canonical Ltd.  This software is licensed under the
+-- GNU Affero General Public License version 3 (see the file LICENSE).
+
+SET client_min_messages=ERROR;
+
+ALTER TABLE Distribution
+    -- 0 == SERIES
+    ADD COLUMN default_traversal_policy integer DEFAULT 0 NOT NULL,
+    ADD COLUMN redirect_default_traversal boolean DEFAULT false NOT NULL;
+
+INSERT INTO LaunchpadDatabaseRevision VALUES (2210, 23, 0);