Fix worker command execution and execution status updates

Changes:
- Removed duplicate /api/executions/:id endpoint that didn't parse logs
- Added workers Map to track worker_id -> WebSocket connection
- Store worker connections when they send worker_connect message
- Send commands to specific worker instead of broadcasting to all clients
- Clean up workers Map when worker disconnects
- Update execution status to completed/failed when command results arrive
- Add proper error handling when worker is not connected

Fixes:
- execution.logs.forEach is not a function (logs now properly parsed)
- Commands stuck in "running" status (now update to completed/failed)
- Commands not reaching workers (now sent to specific worker WebSocket)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

server.js

@@ -100,6 +100,8 @@ async function initDatabase() {
 
 // WebSocket connections
 const clients = new Set();
+const workers = new Map(); // Map worker_id -> WebSocket connection
+
 wss.on('connection', (ws) => {
   clients.add(ws);
 
@@ -125,6 +127,10 @@ wss.on('connection', (ws) => {
           timestamp: timestamp || new Date().toISOString()
         });
 
+        // Update execution status to completed or failed
+        const finalStatus = success ? 'completed' : 'failed';
+        await updateExecutionStatus(execution_id, finalStatus);
+
         // Broadcast result to all connected clients
         broadcast({
           type: 'command_result',
@@ -135,7 +141,7 @@ wss.on('connection', (ws) => {
           stderr: stderr
         });
 
-        console.log(`Command result received for execution ${execution_id}`);
+        console.log(`Command result received for execution ${execution_id}: ${finalStatus}`);
       }
 
       if (message.type === 'workflow_result') {
@@ -173,6 +179,9 @@ wss.on('connection', (ws) => {
         const { worker_id, worker_name } = message;
         console.log(`Worker connected: ${worker_name} (${worker_id})`);
 
+        // Store worker WebSocket connection
+        workers.set(worker_id, ws);
+
         // Update worker status to online
         await pool.query(
           `UPDATE workers SET status='online', last_heartbeat=NOW() WHERE id=?`,
@@ -201,7 +210,17 @@ wss.on('connection', (ws) => {
     }
   });
 
-  ws.on('close', () => clients.delete(ws));
+  ws.on('close', () => {
+    clients.delete(ws);
+    // Remove worker from workers map when disconnected
+    for (const [workerId, workerWs] of workers.entries()) {
+      if (workerWs === ws) {
+        workers.delete(workerId);
+        console.log(`Worker ${workerId} disconnected`);
+        break;
+      }
+    }
+  });
 });
 
 // Broadcast to all connected clients
@@ -379,18 +398,6 @@ app.get('/api/executions', authenticateSSO, async (req, res) => {
   }
 });
 
-app.get('/api/executions/:id', authenticateSSO, async (req, res) => {
-  try {
-    const [rows] = await pool.query('SELECT * FROM executions WHERE id = ?', [req.params.id]);
-    if (rows.length === 0) {
-      return res.status(404).json({ error: 'Not found' });
-    }
-    res.json(rows[0]);
-  } catch (error) {
-    res.status(500).json({ error: error.message });
-  }
-});
-
 // Health check (no auth required)
 app.get('/health', async (req, res) => {
   try {
@@ -780,7 +787,7 @@ app.post('/api/workers/:id/command', authenticateSSO, async (req, res) => {
       }])]
     );
 
-    // Send command via WebSocket
+    // Send command via WebSocket to specific worker
     const commandMessage = {
       type: 'execute_command',
       execution_id: executionId,
@@ -789,11 +796,13 @@ app.post('/api/workers/:id/command', authenticateSSO, async (req, res) => {
       timeout: 60000
     };
 
-    clients.forEach(client => {
-      if (client.readyState === WebSocket.OPEN) {
-        client.send(JSON.stringify(commandMessage));
-      }
-    });
+    const workerWs = workers.get(workerId);
+    if (!workerWs || workerWs.readyState !== WebSocket.OPEN) {
+      return res.status(400).json({ error: 'Worker not connected' });
+    }
+
+    workerWs.send(JSON.stringify(commandMessage));
+    console.log(`Command sent to worker ${workerId}: ${command}`);
 
     broadcast({ type: 'execution_started', execution_id: executionId, workflow_id: null });
     res.json({ success: true, execution_id: executionId });