feat: introduce configurable future partition buffer and add monitoring for future partitions.

postgresql/procedures/04_monitoring_view.sql

@@ -10,6 +10,12 @@ SELECT
     c.period,
     c.keep_history,
     count(child.relname) AS partition_count,
+    count(child.relname) FILTER (
+        WHERE
+           (c.period = 'day' AND child.relname > (parent.relname || '_p' || to_char(now(), 'YYYYMMDD')))
+           OR
+           (c.period = 'month' AND child.relname > (parent.relname || '_p' || to_char(now(), 'YYYYMM')))
+    ) AS future_partitions,
     pg_size_pretty(sum(pg_total_relation_size(child.oid))) AS total_size,
     min(child.relname) AS oldest_partition,
     max(child.relname) AS newest_partition,