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

[Colin Watson]

Merge db-stable 25973a1b7c (Make BugSubscriptionFilter.structuralsubscription NOT NULL)

[Colin Watson (cjwatson)]

Deployed to the production database today.

review: Approve

diff --git a/database/schema/patch-2210-27-0.sql b/database/schema/patch-2210-27-0.sql
new file mode 100644
index 0000000..7a8b01a
--- /dev/null
+++ b/database/schema/patch-2210-27-0.sql
@@ -0,0 +1,9 @@
+-- Copyright 2021 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 BugSubscriptionFilter
+    ALTER COLUMN structuralsubscription SET NOT NULL;
+
+INSERT INTO LaunchpadDatabaseRevision VALUES (2210, 27, 0);