Add conversion rate column

posthog/hogql_queries/web_analytics/stats_table.py

@@ -526,6 +526,20 @@ def calculate(self):
                 else response.columns
             )
 
+        # Add last conversion rate column
+        if self.query.conversionGoal is not None:
+            unique_visitors = results_mapped[0]
+            unique_conversions = results_mapped[-1]
+
+            # Keep them in the same tuple format we already have
+            results_mapped.append(
+                (
+                    unique_conversions[0] / unique_visitors[0] if unique_visitors[0] != 0 else None,
+                    unique_conversions[1] / unique_visitors[1] if unique_visitors[1] != 0 else None,
+                )
+            )
+            columns.append("context.columns.conversion_rate")
+
         return WebStatsTableQueryResponse(
             columns=columns,
             results=results_mapped,