fix on quantities

bot.py

@@ -18,6 +18,7 @@ from __future__ import annotations
 
 import argparse
 import logging
+import math
 import os
 import sys
 from datetime import datetime, timezone
@@ -106,9 +107,13 @@ def run_cycle(config: Config) -> bool:
             if signal is None:
                 continue
 
-            order_id = client.market_sell(
-                position.pair, position.quantity, paper=config.paper_trading
-            )
+            try:
+                order_id = client.market_sell(
+                    position.pair, position.quantity, paper=config.paper_trading
+                )
+            except KrakenError as exc:
+                log.error("Sell failed for %s: %s — will retry next run", position.pair, exc)
+                continue
             pnl_usd = (current_price - position.entry_price) * position.quantity
             log.info(
                 "CLOSED %-10s  reason=%-14s  entry=$%.6f  exit=$%.6f  "
@@ -173,7 +178,7 @@ def run_cycle(config: Config) -> bool:
     )
 
     for opp in to_buy:
-        quantity = round(alloc_per_asset / opp.last_price, opp.lot_decimals)
+        quantity = math.floor(alloc_per_asset / opp.last_price * 10 ** opp.lot_decimals) / 10 ** opp.lot_decimals
 
         if opp.order_min > 0 and quantity < opp.order_min:
             log.warning(