def METHOD_NAME(self, signatures, date):
    def handler(json, data):
        if json["errors"]:
            raise SocorroError()
        del json["hits"]
        for facet in json["facets"].get("signature", {}):
            data.remove(facet["term"])
    date = lmdutils.get_date_ymd(date) - relativedelta(weeks=self.nweeks)
    search_date = SuperSearch.get_search_date(date)
    chunks, size = self.chunkify(signatures)
    base = {
        "date": search_date,
        "signature": "",
        "_result_number": 0,
        "_facets": "signature",
        "_facets_size": size,
    }
    searches = []
    for chunk in chunks:
        params = base.copy()
        params["signature"] = ["=" + x for x in chunk]
        searches.append(
            SuperSearch(
                params=params,
                handler=handler,
                handlerdata=signatures,
                raise_error=True,
            )
        )
    for s in searches:
        s.wait()