adding weight edits

backend/src/app.ts

@@ -64,6 +64,7 @@ import {
   updateBird,
   updateMemorialReminderPreference,
   updateMedicationForBird,
+  updateWeightForBird,
   upsertMedicationAdministrationForBird,
   updateVetVisitForBird,
 } from './repositories/birdRepository.js';
@@ -4150,6 +4151,61 @@ app.post('/api/birds/:birdId/weights', requireAuth, requireWriteAccess, requireW
   }
 });
 
+app.put(
+  '/api/birds/:birdId/weights/:weightId',
+  requireAuth,
+  requireWriteAccess,
+  requireWorkspaceRole(['owner', 'assistant', 'caregiver']),
+  async (req: Request, res: Response, next: NextFunction) => {
+    const parsed = weightSchema.safeParse(req.body);
+
+    if (!parsed.success) {
+      res.status(400).json({ error: 'Invalid weight payload', details: parsed.error.flatten() });
+      return;
+    }
+
+    try {
+      const bird = await getBirdById(req.params.birdId, req.auth!.workspace.id);
+
+      if (!bird) {
+        res.status(404).json({ error: 'Bird not found.' });
+        return;
+      }
+
+      if (!ensureBirdWritable(bird, res)) {
+        return;
+      }
+
+      const weight = await updateWeightForBird(
+        req.params.weightId,
+        req.params.birdId,
+        parsed.data.weightGrams,
+        parsed.data.recordedOn,
+        emptyToNull(parsed.data.notes),
+      );
+
+      if (!weight) {
+        res.status(404).json({ error: 'Weight entry not found.' });
+        return;
+      }
+
+      await writeAuditLog(req.auth!, 'weight.updated', 'weight', weight.id, bird.name, {
+        birdId: bird.id,
+        weightGrams: parsed.data.weightGrams,
+        recordedOn: parsed.data.recordedOn,
+      });
+      res.json({ weight: normalizeWeight(weight) });
+    } catch (error) {
+      if (typeof error === 'object' && error && 'code' in error && error.code === '23505') {
+        res.status(409).json({ error: 'A weight entry already exists for that bird on that date.' });
+        return;
+      }
+
+      next(error);
+    }
+  },
+);
+
 app.get('/api/birds/:birdId/vet-visits', requireAuth, async (req: Request, res: Response, next: NextFunction) => {
   try {
     const vetVisits = await listVetVisitsForBird(req.params.birdId, req.auth!.workspace.id);