Index: src/bp-core/admin/bp-core-admin-schema.php
===================================================================
--- src/bp-core/admin/bp-core-admin-schema.php
+++ src/bp-core/admin/bp-core-admin-schema.php
@@ -143,8 +143,7 @@
 				KEY type (type),
 				KEY mptt_left (mptt_left),
 				KEY mptt_right (mptt_right),
-				KEY hide_sitewide (hide_sitewide),
-				KEY is_spam (is_spam)
+				KEY component_type_user_id_date_recorded (component, type, user_id, date_recorded)
 			) {$charset_collate};";
 
 	$sql[] = "CREATE TABLE {$bp_prefix}bp_activity_meta (