coin pair normalizations

bot.py

@@ -89,11 +89,21 @@ def run_cycle(config: Config) -> bool:
             log.error("Could not fetch position tickers: %s", exc)
             tickers = {}
 
-        # Build a price lookup tolerant of altname vs internal key differences
+        # Build a price lookup tolerant of altname vs internal key differences.
+        # Kraken returns older pairs under internal names (e.g. XZECZUSD instead
+        # of ZECUSD) by adding an X prefix to the base and Z prefix to the quote.
+        # We index each price under both the raw key and the normalised altname.
         price_lookup: dict[str, float] = {}
         for key, ticker in tickers.items():
             try:
-                price_lookup[key] = float(ticker["c"][0])
+                price = float(ticker["c"][0])
+                price_lookup[key] = price
+                # Normalise: XZECZUSD → ZECUSD, XXBTZUSD → XBTUSD
+                normalized = key.replace("ZUSD", "USD")
+                if normalized.startswith("X"):
+                    normalized = normalized[1:]
+                if normalized != key:
+                    price_lookup[normalized] = price
             except (KeyError, ValueError):
                 pass