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_sweep_epyc.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+# v9 EXHAUSTIVE Parameter Sweep for AMD EPYC 7282 (16 cores)
+# Optimized with 24 workers for maximum throughput
+# Testing ALL 65,536 combinations in ~29 hours
+
+echo "🚀 Starting EXHAUSTIVE v9 parameter sweep with 24 workers on EPYC..."
+echo "📊 Testing ALL 65,536 parameter combinations (4×4×4×4×4×4×4×4 grid)"
+echo "⏱️  Estimated completion: ~29 hours"
+echo ""
+echo "Parameter ranges:"
+echo "  flip_thresholds: 0.4, 0.5, 0.6, 0.7"
+echo "  ma_gap: 0.20, 0.30, 0.40, 0.50"
+echo "  momentum_adx: 18, 21, 24, 27"
+echo "  long_pos: 60, 65, 70, 75"
+echo "  short_pos: 20, 25, 30, 35"
+echo "  cooldown_bars: 1, 2, 3, 4"
+echo "  momentum_spacing: 2, 3, 4, 5"
+echo "  momentum_cooldown: 1, 2, 3, 4"
+echo ""
+echo "🎯 EXHAUSTIVE SEARCH - Every possible combination will be tested!"
+
+# CRITICAL: Activate virtual environment before running Python
+source .venv/bin/activate
+
+nohup python3 scripts/run_backtest_sweep.py \
+  --csv data/solusdt_5m.csv \
+  --symbol SOL-PERP \
+  --timeframe 5 \
+  --position-size 8100 \
+  --flip-thresholds "0.4,0.5,0.6,0.7" \
+  --ma-gap-thresholds "0.20,0.30,0.40,0.50" \
+  --momentum-adx "18,21,24,27" \
+  --momentum-long-pos "60,65,70,75" \
+  --momentum-short-pos "20,25,30,35" \
+  --cooldown-bars "1,2,3,4" \
+  --momentum-spacing "2,3,4,5" \
+  --momentum-cooldown "1,2,3,4" \
+  --workers 24 \
+  --top 100 \
+  --output sweep_v9_exhaustive_epyc.csv \
+  > v9_sweep_epyc.log 2>&1 &
+
+echo "✅ Background sweep started (PID: $!)"
+echo "📋 Monitor progress: tail -f v9_sweep_epyc.log"
+echo "📊 Results will be in: sweep_v9_exhaustive_epyc.csv"