diff --git a/doc/timeseries.md b/doc/timeseries.md
index e12bbf4..43335e2 100644
--- a/doc/timeseries.md
+++ b/doc/timeseries.md
@@ -129,7 +129,6 @@ This list is somewhat ordered by likelihood of near-term delivery, or maybe diff
   - Assorted "analytic" functions frequently associated with time-series workloads
   - Periodic `REFRESH MATERIALIZED VIEW` — set schedules for background refresh of materialized views (useful for dashboarding, etc.)
   - Roll-off to `TABLESPACE` — as data ages, it will be moved into a specified table space
-  - Use of "tiered storage", i.e. moving older partitions to be stored in S3 rather than on-disk
   - Automatic `CLUSTER BY`/repack for non-live partitions
   - Migration tools — adapters for existing time-scale installations to ease migration and promote best practices in new table configuration
   - "Approximate" functions — maintain statistics within known error bounds without rescanning all data
diff --git a/sql/timeseries.sql b/sql/timeseries.sql
index d6233a9..b8911dc 100644
--- a/sql/timeseries.sql
+++ b/sql/timeseries.sql
@@ -650,6 +650,9 @@ DECLARE
   old_client_msg text;
   old_log_msg text;
 BEGIN
+  -- check that target_view_id is actually a view
+  -- check that target_view_id mentions only one table
+
   -- get the original SQL definition of the view to be upgraded
   SELECT pg_get_viewdef(target_view_id) INTO orig_view_sql;
 
diff --git a/timeseries.control b/timeseries.control
index 45bd8c7..2119191 100644
--- a/timeseries.control
+++ b/timeseries.control
@@ -2,4 +2,4 @@
 comment = 'Convenience API for Tembo time series stack'
 default_version = '0.1.5'
 module_pathname = '$libdir/timeseries'
-requires = 'columnar, pg_cron, pg_ivm, pg_partman'
+requires = 'pg_cron, pg_ivm, pg_partman'