Update dataset definitions and chart configuration for improved performance

- Changed the sampling interval for the "Fast" dataset from 1 to 0.1 for finer granularity.
- Adjusted the Chart.js plot configuration by setting the delay to 0 for real-time updates.
- Removed "Test" from the active datasets in the system state and updated the last update timestamp.

config/data/dataset_definitions.json

@@ -14,7 +14,7 @@
       "id": "Fast",
       "name": "Fast",
       "prefix": "fast",
-      "sampling_interval": 1
+      "sampling_interval": 0.1
     },
     {
       "enabled": true,

frontend/src/components/ChartjsPlot.jsx

@@ -702,7 +702,7 @@ const ChartjsPlot = ({ session, height = '400px' }) => {
                             realtime: {
                                 duration: (config.time_window || 60) * 1000,
                                 refresh: sessionDataRef.current.refreshRate,
-                                delay: sessionDataRef.current.refreshRate * 2,
+                                delay: 0,
                                 frameRate: 30,
                                 pause: !session.is_active || session.is_paused,
                                 onRefresh: (chart) => {

system_state.json

@@ -4,11 +4,9 @@
         "should_stream": false,
         "active_datasets": [
             "Fast",
-            "Test",
             "DAR"
         ]
     },
     "auto_recovery_enabled": true,
-    "last_update": "2025-08-17T10:38:11.919417",
-    "plotjuggler_path": "C:\\Program Files\\PlotJuggler\\plotjuggler.exe"
+    "last_update": "2025-08-17T10:48:18.548096"
 }