Add index to improve query performance

web/typo3conf/ext/ep_products/ext_tables.sql

@@ -977,7 +977,8 @@ CREATE TABLE tx_epproducts_domain_model_contingent (
 	PRIMARY KEY (uid),
 	KEY parent (pid),
 	KEY t3ver_oid (t3ver_oid,t3ver_wsid),
-	KEY language (l10n_parent,sys_language_uid)
+	KEY language (l10n_parent,sys_language_uid),
+	KEY groups (date,hotel)
 
 );