Add comprehensive data persistence verification

- Added test-persistence.sh script to verify Docker volume mounting
- Enhanced DEPLOYMENT.md with detailed data persistence documentation
- Updated deploy.sh to verify data directory mount on deployment
- Added data/README.md explaining data storage and backup
- Updated data/.gitignore to include README.md
- Documented what data persists and what doesn't
- Added backup strategies and troubleshooting tips

test-persistence.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+
+# Test script to verify Docker data persistence
+
+echo "🧪 Testing Capsule Docker Data Persistence..."
+echo ""
+
+# Ensure data directory exists
+mkdir -p data
+
+# Start container
+echo "📦 Starting container..."
+docker-compose up -d
+
+# Wait for container to be ready
+echo "⏳ Waiting for container to start..."
+sleep 10
+
+# Check if container is running
+if ! docker-compose ps | grep -q "Up"; then
+    echo "❌ Container failed to start"
+    docker-compose logs
+    exit 1
+fi
+
+echo "✅ Container is running"
+echo ""
+
+# Create a test file in the data directory
+TEST_FILE="data/persistence-test-$(date +%s).txt"
+echo "test data from host" > "$TEST_FILE"
+echo "📝 Created test file: $TEST_FILE"
+
+# Check if file is visible in container
+echo "🔍 Checking if file is visible in container..."
+if docker-compose exec capsule ls -la /app/data | grep -q "persistence-test"; then
+    echo "✅ Test file is visible in container"
+else
+    echo "❌ Test file NOT visible in container"
+    exit 1
+fi
+
+# Restart container
+echo ""
+echo "🔄 Restarting container to test persistence..."
+docker-compose restart
+
+# Wait for restart
+sleep 10
+
+# Check if file still exists after restart
+echo "🔍 Checking if test file persists after restart..."
+if [ -f "$TEST_FILE" ]; then
+    echo "✅ Test file persisted after container restart"
+else
+    echo "❌ Test file was lost after restart"
+    exit 1
+fi
+
+# Clean up test file
+rm "$TEST_FILE"
+
+echo ""
+echo "✅ All persistence tests passed!"
+echo ""
+echo "Data persistence verified:"
+echo "  - Host directory: ./data"
+echo "  - Container directory: /app/data"
+echo "  - Data survives container restarts: YES"
+echo ""
+echo "Your user data will be safely stored in ./data/"
+echo ""