diff --git a/src/sql/0-run-first/1-sanitize.sql b/src/sql/0-run-first/1-sanitize.sql
index ea12ea5..5e3cef6 100644
--- a/src/sql/0-run-first/1-sanitize.sql
+++ b/src/sql/0-run-first/1-sanitize.sql
@@ -1,4 +1,7 @@
 DROP TABLE IF EXISTS tokens;
+DROP INDEX IF EXISTS billing_refnum ON billing;
+
+CREATE INDEX billing_refnum ON billing (refNumber);
 
 -- noinspection SqlWithoutWhere
 UPDATE users SET hash = '';