[IMP] rma_account: add index in account.move.line to field 'rma_line_id'

rma_account/models/account_move.py

@@ -238,6 +238,7 @@ class AccountMoveLine(models.Model):
         comodel_name="rma.order.line",
         string="RMA line",
         ondelete="set null",
+        index=True,
         help="This will contain the rma line that originated this line",
     )