♻️ refactor(portal): simplify dictionary comprehensions

_TSG_PARENT_TBIDS: list[int] = [373, 375, 649]  # RAN, SA, CT

# Map SubTB → (tbid, code) for reverse lookup from API TBId field

_SUBTB_TO_WG: dict[int, tuple[int, str]] = {

    r.subtb: (r.tbid, r.code) for r in SUBWORKING_GROUP_RECORDS

}

_SUBTB_TO_WG: dict[int, tuple[int, str]] = {r.subtb: (r.tbid, r.code) for r in SUBWORKING_GROUP_RECORDS}

# Map code → subtb

_CODE_TO_SUBTB: dict[str, int] = {

    r.code: r.subtb for r in SUBWORKING_GROUP_RECORDS

}

_CODE_TO_SUBTB: dict[str, int] = {r.code: r.subtb for r in SUBWORKING_GROUP_RECORDS}

_PAGE_SIZE = 500

DEFAULT_START_DATE = date(1994, 1, 1)

DEFAULT_END_DATE = date.today() + timedelta(days=365 * 3)  # 3 years in the future, to include upcoming meetings

def _build_subtb_filter(subgroups: list[str] | None) -> list[int]:

    """Convert subgroup codes to SubTB IDs for the API ``Tbs`` parameter.