Stage 07.3.5 — WebSocket Probe + REST Fallback

app/src/integrations/exchange/market_cache.py

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+# app/src/integrations/exchange/market_cache.py
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime
+from zoneinfo import ZoneInfo
+
+from src.core.config import load_settings
+
+
+@dataclass(slots=True)
+class MarketPriceSnapshot:
+    symbol: str
+    price: float
+    bid_price: float | None
+    ask_price: float | None
+    updated_at: str
+    source: str = "websocket"
+
+
+class MarketPriceCache:
+    _prices: dict[str, MarketPriceSnapshot] = {}
+
+    # сохранить последнюю цену
+    @classmethod
+    def set_price(
+        cls,
+        *,
+        symbol: str,
+        price: float,
+        bid_price: float | None = None,
+        ask_price: float | None = None,
+        updated_at: str | None = None,
+    ) -> None:
+        settings = load_settings()
+
+        if updated_at is None:
+            updated_at = datetime.now(ZoneInfo(settings.tz)).strftime("%d.%m.%Y %H:%M:%S")
+
+        cls._prices[symbol.upper()] = MarketPriceSnapshot(
+            symbol=symbol.upper(),
+            price=price,
+            bid_price=bid_price,
+            ask_price=ask_price,
+            updated_at=updated_at,
+        )
+
+    # получить последнюю цену
+    @classmethod
+    def get_price(cls, symbol: str) -> MarketPriceSnapshot | None:
+        return cls._prices.get(symbol.upper())