fix: Database-first cluster status detection + Stop button clarification

CRITICAL FIX (Nov 30, 2025):
- Dashboard showed 'idle' despite 22+ worker processes running
- Root cause: SSH-based worker detection timing out
- Solution: Check database for running chunks FIRST

Changes:
1. app/api/cluster/status/route.ts:
   - Query exploration database before SSH detection
   - If running chunks exist, mark workers 'active' even if SSH fails
   - Override worker status: 'offline' → 'active' when chunks running
   - Log: '✅ Cluster status: ACTIVE (database shows running chunks)'
   - Database is source of truth, SSH only for supplementary metrics

2. app/cluster/page.tsx:
   - Stop button ALREADY EXISTS (conditionally shown)
   - Shows Start when status='idle', Stop when status='active'
   - No code changes needed - fixed by status detection

Result:
- Dashboard now shows 'ACTIVE' with 2 workers (correct)
- Workers show 'active' status (was 'offline')
- Stop button automatically visible when cluster active
- System resilient to SSH timeouts/network issues

Verified:
- Container restarted: Nov 30 21:18 UTC
- API tested: Returns status='active', activeWorkers=2
- Logs confirm: Database-first logic working
- Workers confirmed running: 22+ processes on worker1, workers on worker2

run_comprehensive_sweep.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+# Run comprehensive parameter sweep in background with logging
+
+cd /home/icke/traderv4
+
+# Activate virtual environment
+source .backtester/bin/activate
+
+# Create logs directory if not exists
+mkdir -p backtester/logs
+
+# Generate timestamp for log file
+TIMESTAMP=$(date +"%Y%m%d_%H%M%S")
+LOGFILE="backtester/logs/sweep_comprehensive_${TIMESTAMP}.log"
+
+echo "Starting comprehensive parameter sweep..."
+echo "Log file: $LOGFILE"
+echo ""
+echo "To monitor progress in real-time, run:"
+echo "  tail -f $LOGFILE"
+echo ""
+echo "To check if still running:"
+echo "  ps aux | grep comprehensive_sweep"
+echo ""
+echo "To stop the sweep:"
+echo "  pkill -f comprehensive_sweep"
+echo ""
+
+# Run sweep in background with output redirection
+nohup python3 backtester/scripts/comprehensive_sweep.py > "$LOGFILE" 2>&1 &
+
+# Get PID
+SWEEP_PID=$!
+
+echo "Sweep started with PID: $SWEEP_PID"
+echo "Process running in background with nohup"
+echo ""
+echo "Quick commands:"
+echo "  tail -f $LOGFILE          # Watch progress"
+echo "  tail -100 $LOGFILE        # Last 100 lines"
+echo "  grep 'Best so far' $LOGFILE  # See current best"
+echo "  kill $SWEEP_PID           # Stop sweep"
+echo ""
+
+# Wait a moment and check if process started
+sleep 2
+if ps -p $SWEEP_PID > /dev/null 2>&1; then
+    echo "✅ Sweep running successfully (PID: $SWEEP_PID)"
+else
+    echo "❌ Sweep may have failed to start. Check log:"
+    echo "  tail -50 $LOGFILE"
+fi