chore: Add index on attributeoptioncomboid on event [DHIS2-14885]

dhis-2/dhis-support/dhis-support-db-migration/src/main/resources/org/hisp/dhis/db/migration/2.42/V2_42_6__Add_index_attributeoptioncomboid_to_event.sql

@@ -0,0 +1,8 @@
+
+-- Adds a btree index on column 'attributeoptioncomboid' on table 'event'
+-- Uses function 'dhis2_create_index_if_not_exists'
+
+select dhis2_create_index_if_not_exists(
+  'in_event_attributeoptioncomboid',
+  'create index in_event_attributeoptioncomboid on event using btree(attributeoptioncomboid)'
+);