lifecycle: migrate: ensure template schema exists before migrating (#8952)

lifecycle/migrate.py

@@ -64,6 +64,7 @@ def release_lock(cursor: Cursor):
     """Release database lock"""
     if not LOCKED:
         return
+    LOGGER.info("releasing database lock")
     cursor.execute("SELECT pg_advisory_unlock(%s)", (ADV_LOCK_UID,))
 
 

lifecycle/system_migrations/template_schema.py

@@ -0,0 +1,12 @@
+from lifecycle.migrate import BaseMigration
+
+
+class Migration(BaseMigration):
+    def needs_migration(self) -> bool:
+        self.cur.execute(
+            "SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'template';"
+        )
+        return not bool(self.cur.rowcount)
+
+    def run(self):
+        self.cur.execute("CREATE SCHEMA IF NOT EXISTS template; COMMIT;")