chore: enable verbose error logging on experiment calculations to reveal silent production errors

api/experiments.ts

@@ -85,6 +85,7 @@ export default async function handler(req: VercelRequest, res: VercelResponse) {
     if (req.method === 'PUT') {
       const { id } = req.query;
       const updates = req.body;
+      console.log('Update payload for id', id, ':', updates);
 
       const { data, error } = await supabase
         .from('experiments')

components/ExperimentDetail.tsx

@@ -55,9 +55,12 @@ const ExperimentDetail: React.FC<ExperimentDetailProps> = ({ experimentId, onClo
     setLoading(true);
     try {
       const perf = await calculateExperimentPerformance(experiment, salesData);
+      console.log('Calculation yielded performance delta payload:', perf);
       const updated = await updateExperiment(experiment.id, perf);
+      console.log('Update return from backend:', updated);
       setExperiment(updated);
     } catch (e: any) {
+      console.error('Full calculation error:', e);
       alert(`Error calculating results: ${e.message}`);
     } finally {
       setLoading(false);

services/experiments.ts

@@ -59,6 +59,7 @@ export const updateExperiment = async (
   id: string,
   updates: Partial<Experiment>
 ): Promise<Experiment> => {
+  try {
     const response = await fetch(`${API_BASE}?id=${id}`, {
       method: 'PUT',
       headers: { 'Content-Type': 'application/json' },
@@ -66,11 +67,19 @@ export const updateExperiment = async (
     });
 
     if (!response.ok) {
-    const error = await response.json();
+      let errText = await response.text();
-    throw new Error(error.error || 'Failed to update experiment');
+      try {
+        const errJson = JSON.parse(errText);
+        errText = errJson.error || errText;
+      } catch (e) { }
+      throw new Error(errText);
     }
 
     return response.json();
+  } catch (err: any) {
+    console.error('API Error in updateExperiment:', err);
+    throw err;
+  }
 };
 
 export const deleteExperiment = async (id: string): Promise<void> => {