Add documentation for a compound aggregated IP index

(Redmine issue: #6211)

doc/sphinx/_doclib/database.rst

@@ -373,6 +373,7 @@ IDEA event database
     CREATE INDEX IF NOT EXISTS events_cesnet_storagetime_idx ON events USING BTREE (cesnet_storagetime);
     CREATE INDEX IF NOT EXISTS events_cesnet_eventseverity_idx ON events USING BTREE (cesnet_eventseverity) WHERE cesnet_eventseverity IS NOT NULL;
     CREATE INDEX IF NOT EXISTS events_combined_idx ON events USING GIN (category, node_name, protocol, source_port, target_port, source_type, target_type, node_type, cesnet_resolvedabuses, cesnet_inspectionerrors);
+    CREATE INDEX IF NOT EXISTS events_ip_aggr_idx ON events USING GIST (source_ip_aggr_ip4, target_ip_aggr_ip4, source_ip_aggr_ip6, target_ip_aggr_ip6);
 
     CREATE INDEX IF NOT EXISTS thresholds_thresholdtime_idx ON thresholds USING BTREE (thresholdtime);
     CREATE INDEX IF NOT EXISTS thresholds_relapsetime_idx ON thresholds USING BTREE (relapsetime);