fix: harden session error handling, normalizer null guard, extract redis-connection

- Wrap groupFetchAllParticipating in try/catch to prevent unhandled rejection on connect
- Catch errors from async onMessage/onGroups callbacks via Promise.resolve().catch
- Return null from normalizer when key.id is missing (prevents empty upsert key collision)
- Extract parseRedisUrl to redis-connection.ts to eliminate duplication

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/worker/src/whatsapp/normalizer.test.ts

@@ -69,4 +69,9 @@ describe('normalizeMessage', () => {
     const result = normalizeMessage({ message: { conversation: 'hi' } } as proto.IWebMessageInfo);
     expect(result).toBeNull();
   });
+
+  it('returns null when message id is missing (prevents empty-key upsert collisions)', () => {
+    const result = normalizeMessage(makeMsg({ key: { remoteJid: '120363043312345678@g.us', fromMe: false, id: undefined, participant: '919876543210@s.whatsapp.net' } }));
+    expect(result).toBeNull();
+  });
 });

apps/worker/src/whatsapp/normalizer.ts

@@ -35,10 +35,13 @@ export function normalizeMessage(msg: proto.IWebMessageInfo): NormalizedMessage
 
   if (!msg.message) return null;
 
+  const platformMsgId = key.id;
+  if (!platformMsgId) return null;
+
   const content = extractText(msg);
 
   return {
-    platformMsgId: key.id ?? '',
+    platformMsgId,
     sourceGroupJid: remoteJid,
     senderJid: key.participant ?? '',
     senderName: msg.pushName ?? undefined,

apps/worker/src/whatsapp/session.ts

@@ -41,16 +41,24 @@ export async function createWhatsAppSession(
         setTimeout(() => createWhatsAppSession(sessionPath, onMessage, onGroups), 5000);
       }
     } else if (connection === 'open') {
-      logger.info('WhatsApp connected');
-      const groups = await sock.groupFetchAllParticipating();
-      onGroups(groups);
+      try {
+        logger.info('WhatsApp connected');
+        const groups = await sock.groupFetchAllParticipating();
+        await Promise.resolve(onGroups(groups)).catch((err) =>
+          logger.error({ err }, 'Group sync error'),
+        );
+      } catch (err) {
+        logger.error({ err }, 'Failed to fetch groups on connect');
+      }
     }
   });
 
   sock.ev.on('messages.upsert', ({ messages, type }) => {
     if (type !== 'notify') return;
     for (const msg of messages) {
-      onMessage(msg);
+      void Promise.resolve(onMessage(msg)).catch((err) =>
+        logger.error({ err }, 'Error processing message'),
+      );
     }
   });