fix(hub): restore pre-WS quote path and relieve Gate/account contention

Two audit rounds after WS rollback: lighten hub options snapshot, cache hub balances without extra fetch_balance, soft-poll single-flight, and document fixes in R1/R2 reports.

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

crypto_monitor_gate/app.py

@@ -467,6 +467,8 @@ from lib.exchange.gate_ccxt_lib import gate_ccxt_class
 # Gate.io USDT 永续(swap)
 exchange = gate_ccxt_class()({
     "enableRateLimit": True,
+    # 避免关键位监控/账户拉取无限挂起拖垮中控
+    "timeout": int(os.getenv("GATE_CCXT_TIMEOUT_MS", "8000")),
     "options": {
         "defaultType": "swap",
         "defaultMarginMode": _GATE_DEFAULT_MARGIN_MODE,
@@ -4611,14 +4613,25 @@ def _finalize_key_monitor_one_shot(conn, row, last_msg, close_reason):
     conn.execute("DELETE FROM key_monitors WHERE id=?", (row["id"],))
 
 
+_RS_BAR_CACHE: dict[str, dict] = {}
+_RS_BAR_CACHE_TTL_SEC = float(os.getenv("GATE_RS_BAR_CACHE_SEC", "45"))
+
+
 def _fetch_last_closed_bar(symbol):
-    """最近一根闭合 K:[ts, o, h, l, c, v] 或 None."""
+    """最近一根闭合 K:[ts, o, h, l, c, v] 或 None.短缓存减轻关键位监控打爆 ccxt."""
     ex_sym = normalize_exchange_symbol(symbol)
+    now = time.time()
+    cached = _RS_BAR_CACHE.get(ex_sym)
+    if cached and now - float(cached.get("updated_at") or 0) < _RS_BAR_CACHE_TTL_SEC:
+        return cached.get("bar")
     bars = exchange.fetch_ohlcv(ex_sym, timeframe=KLINE_TIMEFRAME, limit=5) or []
     if len(bars) < 2:
+        _RS_BAR_CACHE[ex_sym] = {"updated_at": now, "bar": None}
         return None
     closed = bars[:-1]
-    return closed[-1] if closed else None
+    bar = closed[-1] if closed else None
+    _RS_BAR_CACHE[ex_sym] = {"updated_at": now, "bar": bar}
+    return bar
 
 
 def _key_rs_gate_preview(symbol, upper, lower):
@@ -9893,14 +9906,14 @@ def _hub_meta_bundle():
 
 
 def _hub_account_bundle():
-    funding_capital, trading_capital = get_exchange_capitals(force=True)
+    # 中控看板高频拉取:仅走余额缓存;不再额外 fetch_balance(会与关键位监控争用 ccxt)
+    funding_capital, trading_capital = get_exchange_capitals(force=False)
     funding_usdt = round(funding_capital, 2) if funding_capital is not None else None
     trading_usdt = round(trading_capital, 2) if trading_capital is not None else None
-    available = get_available_trading_usdt()
     return {
         "funding_usdt": funding_usdt,
         "trading_usdt": trading_usdt,
-        "available_trading_usdt": round(available, 2) if available is not None else None,
+        "available_trading_usdt": trading_usdt,
         "trading_day": get_trading_day(app_now()),
     }