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"""Get a summary of datasets, including the datetime they were last updated and how many updates
        they've ever had.
        """
        allowed_attrs = ["uri", "last_dataset_update"]
        
        limit = int(request.args.get("limit", 25))
        offset = int(request.args.get("offset", 0))
        order_by = request.args.get("order_by", "uri")
        uri_pattern = request.args.get("uri_pattern", "")
        lstripped_orderby = order_by.lstrip("-")
        updated_after = _safe_parse_datetime(request.args.get("updated_after"), allow_empty=True)
        updated_before = _safe_parse_datetime(request.args.get("updated_before"), allow_empty=True)
        
        limit = min(50, limit)
        uri_pattern = uri_pattern[:4000]
        if lstripped_orderby not in allowed_attrs:
            return {
                "detail": (
                    f"Ordering with '{lstripped_orderby}' is disallowed or the attribute does not "
                    "exist on the model"