Remove stale synthetic-data warning on unsupported pairs

The warning predated the synthetic fallback removal. Now that the engine
raises DataUnavailableError for unsupported symbols, the flag was always
wrong for XAU/USD and similar pairs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

telegram_bot.py

@@ -55,7 +55,6 @@ _TF_CONFIRMATIONS = {
     "D1":  [Timeframe.H4,  Timeframe.W1],
 }
 
-_SUPPORTED_PAIRS = set(MAJOR_PAIRS + CROSS_PAIRS)
 _GRADE_RANK      = {"A+": 0, "A": 1, "B": 2, "C": 3, "D": 4, "F": 5}
 _EST             = ZoneInfo("America/New_York")
 
@@ -115,7 +114,6 @@ def _build_combined_signal(
     results_by_tf: Dict[str, List[SignalReport]],
     display: str,
     now_str: str,
-    synthetic: bool = False,
 ) -> str:
     """
     Single message showing all timeframes stacked.
@@ -126,12 +124,6 @@ def _build_combined_signal(
     lines.append(f"🌐 <b>{_h(display)} — Signal Analysis</b>")
     lines.append(f"🕐 {now_str}")
 
-    if synthetic:
-        lines.append(
-            "⚠️ <b>Note:</b> Not on Twelve Data free tier — "
-            "prices are <b>simulated</b> data."
-        )
-
     for tf in SCAN_TIMEFRAMES:
         reports = results_by_tf.get(tf, [])
         if not reports:
@@ -372,7 +364,6 @@ class ForexTelegramBot:
             raw += "=X"
         display  = SYMBOL_DISPLAY.get(raw, raw.replace("=X", ""))
         tfs_str  = " · ".join(SCAN_TIMEFRAMES)
-        synthetic = raw not in _SUPPORTED_PAIRS
 
         msg = await update.message.reply_text(
             f"🔄 Analyzing {_h(display)} across {_h(tfs_str)}…"
@@ -386,7 +377,7 @@ class ForexTelegramBot:
                 await msg.edit_text(f"❌ No data returned for {_h(display)}")
                 return
 
-            text = _build_combined_signal(results_by_tf, display, now_str, synthetic)
+            text = _build_combined_signal(results_by_tf, display, now_str)
             await msg.delete()
             await self._send_html(update, text)