fix

backend/app/services/power_curve.py

@@ -0,0 +1,30 @@
+import numpy as np
+
+from backend.app.models.activity import DataPoint
+
+# Standard durations for the power duration curve
+DURATIONS = [1, 5, 10, 15, 30, 60, 120, 300, 600, 1200, 1800, 3600]
+
+
+def calculate_power_curve(data_points: list[DataPoint]) -> dict[int, int]:
+    """
+    Calculate max average power for standard durations.
+    Returns {duration_seconds: max_avg_power}.
+    """
+    powers = np.array([dp.power for dp in data_points if dp.power is not None], dtype=float)
+    if len(powers) == 0:
+        return {}
+
+    result = {}
+    for dur in DURATIONS:
+        if dur > len(powers):
+            break
+        if dur == 1:
+            result[dur] = int(np.max(powers))
+        else:
+            # Rolling mean via cumsum for efficiency
+            cumsum = np.cumsum(np.insert(powers, 0, 0))
+            rolling_avg = (cumsum[dur:] - cumsum[:-dur]) / dur
+            result[dur] = int(np.max(rolling_avg))
+
+    return result