Isolate legacy range-grid features

app/services/sr_service.py

@@ -394,6 +394,34 @@ def _legacy_volume_profile_nodes(
     return hvn + lvn
 
 
+def _legacy_range_grid_nodes(
+    highs: list[float],
+    lows: list[float],
+    closes: list[float],
+    num_bins: int = 20,
+) -> list[float]:
+    """Return every deployed grid center without the irrelevant volume pass.
+
+    The legacy profile returns both its above-average (HVN) and below-average
+    (LVN) bins. Their union is therefore the complete range grid except for the
+    rare bin whose traffic equals the average exactly. This explicit helper
+    isolates that geometry from the misleading volume-profile label.
+    """
+    if len(closes) < 20:
+        raise ValidationError(
+            f"Range grid requires at least 20 bars, got {len(closes)}"
+        )
+    price_min = min(lows)
+    price_max = max(highs)
+    if price_max == price_min:
+        price_max = price_min + 1.0
+    bin_width = (price_max - price_min) / num_bins
+    return [
+        round(price_min + (i + 0.5) * bin_width, 4)
+        for i in range(num_bins)
+    ]
+
+
 def detect_sr_levels_legacy(
     highs: list[float],
     lows: list[float],
@@ -404,6 +432,7 @@ def detect_sr_levels_legacy(
     include_volume_profile: bool = True,
     include_pivots: bool = True,
     neutral_strength: bool = False,
+    explicit_range_grid: bool = False,
 ) -> list[dict]:
     """Deployed detector plus source-isolation controls for local research.
 
@@ -417,7 +446,12 @@ def detect_sr_levels_legacy(
     candidates: list[tuple[float, str]] = []
     if include_volume_profile:
         try:
-            for price in _legacy_volume_profile_nodes(highs, lows, closes, volumes):
+            nodes = (
+                _legacy_range_grid_nodes(highs, lows, closes)
+                if explicit_range_grid
+                else _legacy_volume_profile_nodes(highs, lows, closes, volumes)
+            )
+            for price in nodes:
                 candidates.append((float(price), "volume_profile"))
         except ValidationError:
             pass