Fix dashboard TF key mismatch, increase refresh to 5s

Timeframe keys stored as enum values (15min/1h/4h) but dashboard
looked for M15/1h/4h — GBP/USD showed no price or signal text.
Now uses Timeframe enum directly with display labels. Reduced
dashboard refresh from 60s to 5s with throttle guard.

telegram_bot.py

@@ -325,6 +325,10 @@ _SHORT_SIGNAL = {
 }
 
 
+_TF_DISPLAY = {"5min": "M5", "15min": "M15", "1h": "H1", "4h": "H4", "1d": "D1"}
+_DASH_TFS = [Timeframe.M15, Timeframe.H1, Timeframe.H4]
+
+
 def _format_stats_dashboard() -> str:
     if not _signal_stats:
         return "📊 *Live Dashboard*\n\n_Waiting for first scan…_"
@@ -332,17 +336,15 @@ def _format_stats_dashboard() -> str:
     now = datetime.now(timezone.utc).strftime("%H:%M:%S UTC")
     lines = [f"📊 *Live Dashboard* — {now}", ""]
 
-    tf_order = ["M15", "1h", "4h"]
-
     for symbol in SCAN_PAIRS:
         display = PAIR_INFO.get(symbol, {}).get("display", symbol)
         pair_data = _signal_stats.get(symbol, {})
 
         ws_price = _last_prices.get(symbol)
         latest = None
-        for tf in reversed(tf_order):
-            if tf in pair_data:
-                latest = pair_data[tf]
+        for tf in reversed(_DASH_TFS):
+            if tf.value in pair_data:
+                latest = pair_data[tf.value]
                 break
 
         price = ws_price or (latest.current_price if latest else 0)
@@ -354,14 +356,15 @@ def _format_stats_dashboard() -> str:
         regime = latest.market_regime.replace("_", " ").title() if latest else ""
 
         tf_parts = []
-        for tf in tf_order:
-            r = pair_data.get(tf)
+        for tf in _DASH_TFS:
+            label = _TF_DISPLAY.get(tf.value, tf.value)
+            r = pair_data.get(tf.value)
             if not r:
-                tf_parts.append(f"{tf}: ⬜—")
+                tf_parts.append(f"{label}: ⬜—")
                 continue
             emoji = _SIGNAL_EMOJI.get(r.final_signal, "⬜")
             sig = _SHORT_SIGNAL.get(r.final_signal, "Neutral")
-            tf_parts.append(f"{tf}: {emoji}{sig}")
+            tf_parts.append(f"{label}: {emoji}{sig}")
 
         lines.append(f"*{display}*  {price_str}  _{regime}_")
         lines.append(" | ".join(tf_parts))
@@ -377,7 +380,7 @@ def _format_stats_dashboard() -> str:
 
         lines.append("")
 
-    lines.append("_🔄 auto-refresh 60s_")
+    lines.append("_🔄 live refresh_")
     return "\n".join(lines)
 
 
@@ -385,6 +388,8 @@ def _format_stats_dashboard() -> str:
 
 _dashboard_msg_ids: Dict[int, int] = {}
 _dashboard_task: Optional[asyncio.Task] = None
+_last_dashboard_refresh: float = 0
+_DASHBOARD_THROTTLE = 5
 
 
 async def _send_dashboard(bot, chat_id: int) -> None:
@@ -396,7 +401,13 @@ async def _send_dashboard(bot, chat_id: int) -> None:
         logger.exception(f"Failed to send dashboard to {chat_id}")
 
 
-async def _refresh_dashboard(bot) -> None:
+async def _refresh_dashboard(bot, force: bool = False) -> None:
+    global _last_dashboard_refresh
+    now = time.time()
+    if not force and (now - _last_dashboard_refresh) < _DASHBOARD_THROTTLE:
+        return
+    _last_dashboard_refresh = now
+
     text = _format_stats_dashboard()
     for chat_id in list(_autoscan_chats):
         msg_id = _dashboard_msg_ids.get(chat_id)
@@ -419,7 +430,7 @@ async def _refresh_dashboard(bot) -> None:
 async def _dashboard_loop(bot) -> None:
     try:
         while _autoscan_chats:
-            await asyncio.sleep(60)
+            await asyncio.sleep(5)
             if not _autoscan_chats:
                 break
             await _refresh_dashboard(bot)