Use lightweight ticker APIs for liquidity rank to cut memory.

Co-authored-by: Cursor <cursoragent@cursor.com>

hub_volume_rank_lib.py

@@ -13,6 +13,7 @@ from hub_trades_lib import trading_day_from_dt
 
 TOP_N_DEFAULT = 20
 CACHE_VERSION = 3
+LIQUIDITY_RANK_CACHE_VERSION = 1
 
 
 def volume_rank_reset_hour() -> int:
@@ -372,6 +373,62 @@ def _collect_scores(exchange, exchange_id: str) -> list[tuple[str, str, float]]:
     return _scores_from_markets(exchange, tickers or {}, ex_id)
 
 
+def build_usdt_swap_volume_ranks(
+    exchange,
+    ensure_markets_loaded: Callable[[], None],
+    *,
+    exchange_id: str | None = None,
+) -> tuple[dict[str, int], int]:
+    """
+    全市场 USDT 永续 24h 成交额排名（base -> rank）。
+    优先各所轻量 ticker API，避免 fetch_tickers() 拉全市场（Gate/Binance 内存优化）。
+    """
+    ensure_markets_loaded()
+    ex_id = str(exchange_id or getattr(exchange, "id", "") or "").lower()
+    scored = _collect_scores(exchange, ex_id)
+    ranks: dict[str, int] = {}
+    for idx, (_sym, base, _qv) in enumerate(scored, 1):
+        if base and base not in ranks:
+            ranks[base] = idx
+    return ranks, len(scored)
+
+
+def resolve_daily_volume_rank(
+    target_base: str,
+    cache: dict[str, Any],
+    *,
+    now_ts: float,
+    ttl_sec: float,
+    exchange,
+    ensure_markets_loaded: Callable[[], None],
+    exchange_id: str | None = None,
+    cache_version: int = LIQUIDITY_RANK_CACHE_VERSION,
+) -> tuple[int | None, int]:
+    """关键位门控：按 base 查 24h 成交额全市场排名；cache 带 TTL。"""
+    cached_ok = (
+        cache.get("version") == cache_version
+        and cache.get("updated_at")
+        and now_ts - float(cache["updated_at"]) < ttl_sec
+    )
+    if not cached_ok:
+        try:
+            ranks, total = build_usdt_swap_volume_ranks(
+                exchange,
+                ensure_markets_loaded,
+                exchange_id=exchange_id,
+            )
+            cache["ranks"] = ranks
+            cache["total"] = total
+            cache["version"] = cache_version
+            cache["updated_at"] = now_ts
+        except Exception:
+            pass
+    ranks = cache.get("ranks") or {}
+    total = int(cache.get("total") or 0)
+    base = str(target_base or "").strip().upper()
+    return ranks.get(base), total
+
+
 def fetch_usdt_swap_volume_rank(
     exchange,
     ensure_markets_loaded: Callable[[], None],