Stage 07.4.3.2 — price polling, event bus and UI throttling

app/src/integrations/exchange/market_cache.py

@@ -16,7 +16,7 @@ class MarketPriceSnapshot:
     bid_price: float | None
     ask_price: float | None
     updated_at: str
-    source: str = "websocket"
+    source: str = "market-cache"
 
 
 class MarketPriceCache:
@@ -32,6 +32,7 @@ class MarketPriceCache:
         bid_price: float | None = None,
         ask_price: float | None = None,
         updated_at: str | None = None,
+        source: str = "market-polling",
     ) -> None:
         settings = load_settings()
 
@@ -44,6 +45,7 @@ class MarketPriceCache:
             bid_price=bid_price,
             ask_price=ask_price,
             updated_at=updated_at,
+            source=source,
         )
 
     # получить последнюю цену