Update observability.py

observability.py

@@ -121,6 +121,13 @@ class LLMObservabilityManager:
         Returns:
             Dict containing dashboard statistics and time series data
         """
+        
+        def calculate_percentage_change(old_value: float, new_value: float) -> float:
+            """Calculate percentage change between two values."""
+            if old_value == 0:
+                return 100 if new_value > 0 else 0
+            return round(((new_value - old_value) / old_value) * 100, 2)
+        
         with sqlite3.connect(self.db_path) as conn:
             cursor = conn.cursor()
             
@@ -261,9 +268,4 @@ class LLMObservabilityManager:
                 "time_series": time_series,
                 "trends": trends
             }
-    
-    def calculate_percentage_change(old_value: float, new_value: float) -> float:
-        """Calculate percentage change between two values."""
-        if old_value == 0:
-            return 100 if new_value > 0 else 0
-        return round(((new_value - old_value) / old_value) * 100, 2)
+