diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7b4c2c7..8f77ecb 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -20,6 +20,7 @@ jobs:
     strategy:
       matrix:
         postgres_major_version: [
+          "11",
           "12",
           "13",
           "14",
diff --git a/powa--5.0.0dev.sql b/powa--5.0.0dev.sql
index 5d76fdc..6ba0b05 100644
--- a/powa--5.0.0dev.sql
+++ b/powa--5.0.0dev.sql
@@ -2476,7 +2476,7 @@ BEGIN
         -- There are stored dbnames and users provided some.  Keep the module
         -- activated and simply remove the specified dbnames
         ASSERT v_enabled IS TRUE, 'Module should be enabled';
-        SELECT array_agg(dbname)
+        SELECT array_agg(dbname ORDER BY dbname)
         FROM (
             SELECT unnest(v_dbnames)
             EXCEPT
@@ -4617,8 +4617,9 @@ BEGIN
             s.datid, s.numbackends, s.xact_commit, s.xact_rollback,
             s.blks_read, s.blks_hit, s.tup_returned, s.tup_fetched,
             s.tup_inserted, s.tup_updated, s.tup_deleted, s.conflicts,
-            s.temp_files, s.temp_bytes, s.deadlocks, 0 AS checksum_failures,
-            NULL::double precision AS checksum_last_failure,
+            s.temp_files, s.temp_bytes, s.deadlocks,
+            0::bigint AS checksum_failures,
+            NULL::timestamptz AS checksum_last_failure,
             s.blk_read_time, s.blk_write_time,
             NULL::double precision AS session_time,
             NULL::double precision AS active_time,