Add READ_ONLY_API environment variable and enhance trading error handling

routers/charts.py

@@ -24,13 +24,66 @@ class ChartState:
     def __init__(self):
         self.latest_tick = None
         self.current_ticker = None
+        self.current_symbol = None
         self.current_minute = None
         self.current_ohlc = None
+        self.history_poll_task = None
+        self.last_realtime_update = 0.0
 
 
 chart_state = ChartState()
 
 
+async def _stop_history_poll_task() -> None:
+    task = chart_state.history_poll_task
+    chart_state.history_poll_task = None
+    if task is None or task.done():
+        return
+    task.cancel()
+    try:
+        await task
+    except asyncio.CancelledError:
+        pass
+
+
+async def _history_fallback_loop(symbol: str, contract) -> None:
+    ib = dependencies.get_ib()
+    try:
+        while chart_state.current_symbol == symbol:
+            # Only fall back when real-time bars have not updated recently.
+            if chart_state.last_realtime_update and (
+                time.monotonic() - chart_state.last_realtime_update
+            ) < 20:
+                await asyncio.sleep(15)
+                continue
+
+            try:
+                bars = await ib.reqHistoricalDataAsync(
+                    contract,
+                    endDateTime="",
+                    durationStr="1 D",
+                    barSizeSetting="1 min",
+                    whatToShow="TRADES",
+                    useRTH=True,
+                    formatDate=1,
+                )
+                if bars:
+                    last_bar = bars[-1]
+                    chart_state.latest_tick = {
+                        "time": int(last_bar.date.timestamp()),
+                        "open": last_bar.open,
+                        "high": last_bar.high,
+                        "low": last_bar.low,
+                        "close": last_bar.close,
+                    }
+            except Exception as exc:
+                logger.warning(f"Historical fallback update failed for {symbol}: {exc}")
+
+            await asyncio.sleep(15)
+    except asyncio.CancelledError:
+        pass
+
+
 @router.get("/", response_class=HTMLResponse)
 async def index(request: Request, symbol: str = ""):
     return templates.TemplateResponse(request, "index.html", {"symbol": symbol})
@@ -115,8 +168,13 @@ async def subscribe(request: Request):
             except Exception as e:
                 print(f"Error cancelling real-time bars: {e}")
 
+        await _stop_history_poll_task()
+
+        chart_state.current_symbol = symbol
+        chart_state.latest_tick = None
         chart_state.current_minute = None
         chart_state.current_ohlc = None
+        chart_state.last_realtime_update = 0.0
 
         ticker = ib.reqRealTimeBars(qualified[0], barSize=5, whatToShow="TRADES", useRTH=True)
         chart_state.current_ticker = ticker
@@ -152,9 +210,13 @@ async def subscribe(request: Request):
                     "close": bar.close,
                 }
 
+            chart_state.last_realtime_update = time.monotonic()
             chart_state.latest_tick = chart_state.current_ohlc.copy()
 
         ticker.updateEvent += on_bar
+        chart_state.history_poll_task = asyncio.create_task(
+            _history_fallback_loop(symbol, qualified[0])
+        )
 
         return {"status": "ok", "symbol": symbol}
     except Exception as e:

routers/health.py

@@ -1,3 +1,5 @@
+import os
+
 from fastapi import APIRouter
 from fastapi.responses import JSONResponse
 
@@ -10,6 +12,7 @@ router = APIRouter()
 async def health():
     ib_connected = False
     account = None
+    trading_mode = os.getenv("TRADING_MODE", "unknown").split("#", 1)[0].strip() or "unknown"
     try:
         ib_inst = dependencies.get_ib()
         ib_connected = ib_inst.isConnected()
@@ -30,6 +33,7 @@ async def health():
         {
             "status": "ok" if (ib_connected and db_ok) else "degraded",
             "ib_connected": ib_connected,
+            "trading_mode": trading_mode,
             "account": account,
             "db_ok": db_ok,
             "version": "3.0",

routers/trades.py

@@ -4,7 +4,7 @@ import os
 from datetime import datetime, timezone
 
 from fastapi import APIRouter, HTTPException, Request
-from fastapi.responses import HTMLResponse
+from fastapi.responses import HTMLResponse, JSONResponse
 from fastapi.templating import Jinja2Templates
 from ib_async import LimitOrder, MarketOrder, Stock
 
@@ -34,6 +34,18 @@ def log_trade(symbol, action, quantity, price, cursor, conn, lock):
     logger.info(f"Logged trade: {action} {quantity} {symbol} @ ${price:.2f}")
 
 
+def _latest_trade_message(trade) -> str:
+    for entry in reversed(getattr(trade, "log", []) or []):
+        message = getattr(entry, "message", "")
+        if message:
+            return message
+    return ""
+
+
+def _normalized_trade_status(trade) -> str:
+    return (getattr(getattr(trade, "orderStatus", None), "status", "") or "").strip()
+
+
 @router.get("/tradelog", response_class=HTMLResponse)
 async def tradelog(request: Request):
     cursor = dependencies.get_db_cursor()
@@ -145,9 +157,40 @@ async def webhook(request: Request):
         primary_trade = trades_list[0]
         for _ in range(60):
             await asyncio.sleep(0.5)
+            status = _normalized_trade_status(primary_trade)
+            if status in {"ValidationError", "Cancelled", "ApiCancelled", "Inactive"}:
+                break
             if primary_trade.isDone():
                 break
 
+        status = _normalized_trade_status(primary_trade)
+        if status == "ValidationError":
+            for t in trades_list:
+                try:
+                    ib.cancelOrder(t.order)
+                except Exception:
+                    pass
+            detail = _latest_trade_message(primary_trade) or "Order was rejected by IBKR"
+            raise HTTPException(status_code=409, detail=detail)
+
+        if status in {"Cancelled", "ApiCancelled", "Inactive"} and not primary_trade.fills:
+            detail = _latest_trade_message(primary_trade) or f"Order became {status}"
+            raise HTTPException(status_code=409, detail=detail)
+
+        if status in {"PendingSubmit", "PreSubmitted", "Submitted"} and not primary_trade.fills:
+            return JSONResponse(
+                status_code=202,
+                content={
+                    "status": "accepted",
+                    "symbol": symbol,
+                    "action": action,
+                    "quantity": quantity,
+                    "order_type": order_type,
+                    "order_status": status,
+                    "message": _latest_trade_message(primary_trade),
+                },
+            )
+
         if not primary_trade.isDone() or not primary_trade.fills:
             for t in trades_list:
                 try: