trimmed weight edit

backend/src/app.ts

@@ -306,6 +306,15 @@ const weightSchema = z.object({
   recordedOn: dateStringSchema,
   notes: z.string().trim().max(280).optional().or(z.literal('')),
 });
+const weightEditWindowDays = 3;
+
+const getWeightEditEarliestDate = () => {
+  const earliestDate = new Date();
+  earliestDate.setDate(earliestDate.getDate() - (weightEditWindowDays - 1));
+  return earliestDate.toISOString().slice(0, 10);
+};
+
+const isWeightDateEditable = (recordedOn: string) => recordedOn >= getWeightEditEarliestDate();
 
 const vetVisitSchema = z.object({
   visitedOn: dateStringSchema,
@@ -4094,6 +4103,11 @@ app.put(
         return;
       }
 
+      if (!isWeightDateEditable(parsed.data.recordedOn)) {
+        res.status(409).json({ error: 'Weight entries can only be edited for the last 3 days.' });
+        return;
+      }
+
       const weight = await updateWeightForBird(
         req.params.weightId,
         req.params.birdId,
@@ -4103,7 +4117,7 @@ app.put(
       );
 
       if (!weight) {
-        res.status(404).json({ error: 'Weight entry not found.' });
+        res.status(404).json({ error: 'Weight entry not found or no longer editable.' });
         return;
       }