save state to pickle file, restart timers on restart

hbd/server/templates/plugins.html

@@ -459,23 +459,27 @@
         }
       }
 
+      // Protocol metadata fields injected by the client – never plugin metrics
+      const SKIP_FIELDS = new Set(['id', 'name']);
+
       function renderPluginData(data, timestamp) {
         // Check if this should be rendered as a simple table
         const pluginName = getCurrentPluginName();
         const simplePlugins = ['os_info', 'cpu_monitor', 'memory_monitor', 'nagios_runner'];
-        
+
         if (simplePlugins.includes(pluginName) && isSimpleKeyValueData(data)) {
           return renderSimpleDataTable(data, timestamp);
         }
-        
+
         let html = '<div class="metric-grid">';
-        
+
         for (const [key, value] of Object.entries(data)) {
+          if (SKIP_FIELDS.has(key)) continue;
           // Skip nested objects for now, handle them separately
           if (typeof value === 'object' && value !== null) {
             continue;
           }
-          
+
           html += renderMetric(key, value);
         }
         
@@ -572,10 +576,11 @@
         // Table body
         html += '<tbody>';
         for (const [key, value] of Object.entries(data)) {
+          if (SKIP_FIELDS.has(key)) continue;
           const label = formatLabel(key);
           const formattedValue = formatValue(key, value);
           const unit = getUnit(key);
-          
+
           html += '<tr>';
           html += `<td class="name">${label}</td>`;
           html += `<td class="value">${formattedValue}${unit ? ' ' + unit : ''}</td>`;
@@ -1012,12 +1017,17 @@
       }
 
       function formatLabel(key) {
+        if (key === 'time') return 'Collected At';
         return key
           .replace(/_/g, ' ')
           .replace(/\b\w/g, l => l.toUpperCase());
       }
 
       function formatValue(key, value) {
+        // Epoch timestamp field sent by the client alongside plugin data
+        if (key === 'time' && typeof value === 'number') {
+          return new Date(value * 1000).toLocaleString();
+        }
         if (typeof value === 'number') {
           // Format percentages
           if (key.includes('percent') || key.includes('usage')) {