Make tag equals filter case insensitive

                if ":" not in val:

                    # We require an exact match and the tag to look for has no user_value,

                    # so we can't just concatenate user_tname, ':' and user_vale

                    cond = target_model.table.c.user_tname == val

                    cond = target_model.table.c.user_tname.ilike(val)

                else:

                    cond = column == val

                    cond = column.ilike(val)

            else:

                cond = column.contains(val, autoescape=True)

            return sql.expression.and_(model_class.table.c.id == getattr(target_model.table.c, id_column), cond)