fix: automatic column additions, permissions grants and docs updates for seamless upgrades

postgresql/procedures/03_monitoring_view.sql

@@ -31,3 +31,12 @@ LEFT JOIN pg_inherits ON pg_inherits.inhparent = parent.oid
 LEFT JOIN pg_class child ON pg_inherits.inhrelid = child.oid
 WHERE parent.relkind = 'p' -- Only partitioned tables
 GROUP BY parent.relname, c.table_name, c.period, c.keep_history, c.future_partitions, c.last_updated;
+
+-- ============================================================================
+-- IMPORTANT: Since DROP VIEW / CREATE VIEW resets permissions, we automatically
+-- grant read access to PUBLIC. This ensures that whatever monitoring user
+-- (e.g. zbx_monitor) is connecting to the DB will always be able to read 
+-- the monitoring stats without manual intervention after upgrades.
+-- ==========================================================================
+GRANT USAGE ON SCHEMA partitions TO PUBLIC;
+GRANT SELECT ON partitions.monitoring TO PUBLIC;