1er

backend/app/services/pricing.py

@@ -0,0 +1,12 @@
+from __future__ import annotations
+
+
+def price_trend(prices: list[float]) -> str:
+    if not prices:
+        return "stable"
+    first, last = prices[0], prices[-1]
+    if last > first:
+        return "up"
+    if last < first:
+        return "down"
+    return "stable"