Storage: "table refreshes" plus refresh_interval and REFRESH TABLE

Author: amotl

docs/feature/storage/index.md

@@ -139,6 +139,11 @@ always-on analytics environments where data never stops flowing in.
   maintaining efficient bulk ingestion without overwhelming the storage layer
   or exhausting other cluster resources.
 
+  CrateDB refreshes tables once per second by default, but this can be configured
+  on a per-table level by using the {ref}`crate-reference:sql-create-table-refresh-interval`
+  table parameter.
+  You can also force writes manually by using the
+  {ref}`REFRESH TABLE <crate-reference:sql-refresh>` SQL command.
 
 ## Related sections