added Huobi HTX data provider

web/clean_dashboard.py

@@ -58,6 +58,12 @@ logger = logging.getLogger(__name__)
 
 # Reduce Werkzeug/Dash logging noise
 logging.getLogger('werkzeug').setLevel(logging.WARNING)
+
+# Type imports for linter clarity (not required at runtime)
+try:
+    from core.data_models import BaseDataInput, OHLCVBar, COBData, PivotPoint  # noqa: F401
+except Exception:
+    pass
 logging.getLogger('dash').setLevel(logging.WARNING)
 logging.getLogger('dash.dash').setLevel(logging.WARNING)
 
@@ -2416,6 +2422,50 @@ class CleanTradingDashboard:
             
             # Mini 1-second chart (if available)
             if has_mini_chart and ws_data_1s is not None:
+                # Overlay COB heatmap (up to 5 minutes) behind the 1s price line
+                try:
+                    hm_seconds = 300  # 5 minutes
+                    bucket_radius = 10  # ±10 buckets
+                    # Prefer raw liquidity for visual; models can still use normalized features internally
+                    times, prices, matrix, mids = self.data_provider.get_cob_heatmap_matrix(
+                        symbol=symbol,
+                        seconds=hm_seconds,
+                        bucket_radius=bucket_radius,
+                        metric='liquidity'
+                    )
+                    if times and prices and matrix:
+                        # Align times to local tz-naive to match chart
+                        try:
+                            _local_tz = datetime.now().astimezone().tzinfo
+                        except Exception:
+                            _local_tz = None
+                        x_vals = []
+                        for t in times:
+                            try:
+                                if hasattr(t, 'tzinfo') and t.tzinfo is not None:
+                                    tt = t.astimezone(_local_tz) if _local_tz else t
+                                    tt = tt.replace(tzinfo=None)
+                                else:
+                                    tt = t
+                                x_vals.append(tt)
+                            except Exception:
+                                x_vals.append(t)
+                        # Plot heatmap beneath the 1s price line
+                        fig.add_trace(
+                            go.Heatmap(
+                                x=x_vals,
+                                y=prices,  # numeric prices to share axis with 1s line
+                                z=matrix,
+                                colorscale='Turbo',
+                                showscale=False,
+                                zsmooth='best',
+                                opacity=0.8,
+                                name='COB Liquidity'
+                            ),
+                            row=2, col=1
+                        )
+                except Exception as e:
+                    logger.debug(f"COB heatmap overlay skipped: {e}")
                 # Align mini chart to local tz-naive
                 try:
                     if hasattr(ws_data_1s.index, 'tz') and ws_data_1s.index.tz is not None: