diff --git a/application_events.json b/application_events.json
index 0c42a82..f38bb17 100644
--- a/application_events.json
+++ b/application_events.json
@@ -7160,8 +7160,273 @@
         "trigger_variable": null,
         "auto_started": true
       }
+    },
+    {
+      "timestamp": "2025-08-15T19:21:26.768254",
+      "level": "info",
+      "event_type": "plot_session_created",
+      "message": "Plot session 'UR29' created and started",
+      "details": {
+        "session_id": "plot_1_1755278486768_11",
+        "variables": [
+          "UR29_Brix",
+          "UR29_ma",
+          "AUX Blink_1.0S",
+          "AUX Blink_1.6S"
+        ],
+        "time_window": 36,
+        "trigger_variable": null,
+        "auto_started": true
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:21:50.617034",
+      "level": "info",
+      "event_type": "application_started",
+      "message": "Application initialization completed successfully",
+      "details": {}
+    },
+    {
+      "timestamp": "2025-08-15T19:21:50.682511",
+      "level": "info",
+      "event_type": "dataset_activated",
+      "message": "Dataset activated: DAR",
+      "details": {
+        "dataset_id": "DAR",
+        "variables_count": 2,
+        "streaming_count": 2,
+        "prefix": "gateway_phoenix"
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:21:50.690509",
+      "level": "info",
+      "event_type": "dataset_activated",
+      "message": "Dataset activated: Fast",
+      "details": {
+        "dataset_id": "Fast",
+        "variables_count": 2,
+        "streaming_count": 1,
+        "prefix": "fast"
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:21:50.700936",
+      "level": "info",
+      "event_type": "csv_recording_started",
+      "message": "CSV recording started: 2 datasets activated",
+      "details": {
+        "activated_datasets": 2,
+        "total_datasets": 3
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:22:31.628745",
+      "level": "info",
+      "event_type": "plot_session_created",
+      "message": "Plot session 'UR29' created and started",
+      "details": {
+        "session_id": "plot_1_1755278551628_2",
+        "variables": [
+          "UR29_Brix",
+          "UR29_ma",
+          "AUX Blink_1.0S",
+          "AUX Blink_1.6S"
+        ],
+        "time_window": 36,
+        "trigger_variable": null,
+        "auto_started": true
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:22:55.516514",
+      "level": "info",
+      "event_type": "plot_session_created",
+      "message": "Plot session 'UR29' created and started",
+      "details": {
+        "session_id": "plot_1_1755278575515_3",
+        "variables": [
+          "UR29_Brix",
+          "UR29_ma",
+          "AUX Blink_1.0S",
+          "AUX Blink_1.6S"
+        ],
+        "time_window": 36,
+        "trigger_variable": null,
+        "auto_started": true
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:25:04.730033",
+      "level": "info",
+      "event_type": "application_started",
+      "message": "Application initialization completed successfully",
+      "details": {}
+    },
+    {
+      "timestamp": "2025-08-15T19:25:04.779181",
+      "level": "info",
+      "event_type": "dataset_activated",
+      "message": "Dataset activated: DAR",
+      "details": {
+        "dataset_id": "DAR",
+        "variables_count": 2,
+        "streaming_count": 2,
+        "prefix": "gateway_phoenix"
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:25:04.786391",
+      "level": "info",
+      "event_type": "dataset_activated",
+      "message": "Dataset activated: Fast",
+      "details": {
+        "dataset_id": "Fast",
+        "variables_count": 2,
+        "streaming_count": 1,
+        "prefix": "fast"
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:25:04.795793",
+      "level": "info",
+      "event_type": "csv_recording_started",
+      "message": "CSV recording started: 2 datasets activated",
+      "details": {
+        "activated_datasets": 2,
+        "total_datasets": 3
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:28:14.264386",
+      "level": "info",
+      "event_type": "application_started",
+      "message": "Application initialization completed successfully",
+      "details": {}
+    },
+    {
+      "timestamp": "2025-08-15T19:28:14.328949",
+      "level": "info",
+      "event_type": "dataset_activated",
+      "message": "Dataset activated: DAR",
+      "details": {
+        "dataset_id": "DAR",
+        "variables_count": 2,
+        "streaming_count": 2,
+        "prefix": "gateway_phoenix"
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:28:14.336952",
+      "level": "info",
+      "event_type": "dataset_activated",
+      "message": "Dataset activated: Fast",
+      "details": {
+        "dataset_id": "Fast",
+        "variables_count": 2,
+        "streaming_count": 1,
+        "prefix": "fast"
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:28:14.346444",
+      "level": "info",
+      "event_type": "csv_recording_started",
+      "message": "CSV recording started: 2 datasets activated",
+      "details": {
+        "activated_datasets": 2,
+        "total_datasets": 3
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:33:01.899945",
+      "level": "info",
+      "event_type": "plot_session_created",
+      "message": "Plot session 'UR29' created and started",
+      "details": {
+        "session_id": "plot_1_1755279181898_2",
+        "variables": [
+          "UR29_Brix",
+          "UR29_ma",
+          "AUX Blink_1.0S",
+          "AUX Blink_1.6S"
+        ],
+        "time_window": 36,
+        "trigger_variable": null,
+        "auto_started": true
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:35:23.574418",
+      "level": "info",
+      "event_type": "application_started",
+      "message": "Application initialization completed successfully",
+      "details": {}
+    },
+    {
+      "timestamp": "2025-08-15T19:35:23.621963",
+      "level": "info",
+      "event_type": "dataset_activated",
+      "message": "Dataset activated: DAR",
+      "details": {
+        "dataset_id": "DAR",
+        "variables_count": 2,
+        "streaming_count": 2,
+        "prefix": "gateway_phoenix"
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:35:23.631481",
+      "level": "info",
+      "event_type": "dataset_activated",
+      "message": "Dataset activated: Fast",
+      "details": {
+        "dataset_id": "Fast",
+        "variables_count": 2,
+        "streaming_count": 1,
+        "prefix": "fast"
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:35:23.642043",
+      "level": "info",
+      "event_type": "csv_recording_started",
+      "message": "CSV recording started: 2 datasets activated",
+      "details": {
+        "activated_datasets": 2,
+        "total_datasets": 3
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:40:28.186263",
+      "level": "info",
+      "event_type": "config_reload",
+      "message": "Dataset configuration reloaded from files with CSV header validation",
+      "details": {
+        "datasets_count": 3,
+        "active_datasets_count": 3,
+        "csv_recording_active": true
+      }
+    },
+    {
+      "timestamp": "2025-08-15T19:40:55.642005",
+      "level": "info",
+      "event_type": "plot_session_created",
+      "message": "Plot session 'UR29' created and started",
+      "details": {
+        "session_id": "plot_1_1755279655640_2",
+        "variables": [
+          "UR29_Brix",
+          "UR29_ma",
+          "AUX Blink_1.0S",
+          "AUX Blink_1.6S"
+        ],
+        "time_window": 36,
+        "trigger_variable": null,
+        "auto_started": true
+      }
     }
   ],
-  "last_updated": "2025-08-15T19:06:20.284691",
-  "total_entries": 583
+  "last_updated": "2025-08-15T19:40:55.642005",
+  "total_entries": 605
 }
\ No newline at end of file
diff --git a/frontend/src/components/TabCoordinationDemo.jsx b/frontend/src/components/TabCoordinationDemo.jsx
new file mode 100644
index 0000000..0e5b3b3
--- /dev/null
+++ b/frontend/src/components/TabCoordinationDemo.jsx
@@ -0,0 +1,62 @@
+import React from 'react'
+import { Box, Text, Badge, VStack, HStack, useColorModeValue } from '@chakra-ui/react'
+import { getTabCoordinator } from '../utils/TabCoordinator'
+
+/**
+ * TabCoordinationDemo - Componente de demostración para mostrar el estado de coordinación
+ */
+export default function TabCoordinationDemo() {
+    const [coordinator, setCoordinator] = React.useState(null)
+    const [isLeader, setIsLeader] = React.useState(false)
+    const [tabInfo, setTabInfo] = React.useState({})
+    const bgColor = useColorModeValue('gray.50', 'gray.800')
+    
+    React.useEffect(() => {
+        const coord = getTabCoordinator()
+        setCoordinator(coord)
+        setIsLeader(coord.getIsLeader())
+        setTabInfo({
+            tabId: coord.tabId,
+            isLeader: coord.getIsLeader()
+        })
+        
+        // Subscribirse a cambios de liderazgo
+        const unsubscribe = coord.subscribe('demo', ({ type, data }) => {
+            if (type === 'leadership_change') {
+                setIsLeader(data.isLeader)
+                setTabInfo(prev => ({
+                    ...prev,
+                    isLeader: data.isLeader
+                }))
+            }
+        })
+        
+        return unsubscribe
+    }, [])
+    
+    if (!coordinator) {
+        return <Text>Loading coordinator...</Text>
+    }
+    
+    return (
+        <Box p={3} bg={bgColor} borderRadius="md" border="1px" borderColor="gray.200">
+            <VStack align="start" spacing={2}>
+                <HStack>
+                    <Text fontWeight="bold">🔗 Tab Coordination Status</Text>
+                    <Badge colorScheme={isLeader ? 'green' : 'blue'}>
+                        {isLeader ? '👑 Leader' : '👥 Follower'}
+                    </Badge>
+                </HStack>
+                <Text fontSize="sm" color="gray.600">
+                    Tab ID: <code>{tabInfo.tabId}</code>
+                </Text>
+                <Text fontSize="sm" color="gray.600">
+                    Role: {isLeader ? 'Making real connections to backend' : 'Receiving data from leader tab'}
+                </Text>
+                <Text fontSize="xs" color="gray.500">
+                    Only the leader tab creates actual HTTP connections. Other tabs receive data via BroadcastChannel.
+                </Text>
+            </VStack>
+        </Box>
+    )
+}
diff --git a/frontend/src/hooks/useCoordinatedConnection.js b/frontend/src/hooks/useCoordinatedConnection.js
index 2af6584..2365f31 100644
--- a/frontend/src/hooks/useCoordinatedConnection.js
+++ b/frontend/src/hooks/useCoordinatedConnection.js
@@ -148,6 +148,14 @@ export function useCoordinatedSSE(source, url, dependencies = []) {
     return useCoordinatedConnection(
         source,
         useCallback((onData) => {
+            // Don't create EventSource if URL is null or undefined
+            if (!url) {
+                console.log(`Skipping SSE connection - URL is ${url}`)
+                return {
+                    close: () => {} // Return mock connection with close method
+                }
+            }
+            
             console.log(`Creating SSE connection to ${url}`)
             const eventSource = new EventSource(url)
             
diff --git a/system_state.json b/system_state.json
index 030bc8b..da9fe66 100644
--- a/system_state.json
+++ b/system_state.json
@@ -3,11 +3,11 @@
         "should_connect": true,
         "should_stream": false,
         "active_datasets": [
+            "Fast",
             "DAR",
-            "Test",
-            "Fast"
+            "Test"
         ]
     },
     "auto_recovery_enabled": true,
-    "last_update": "2025-08-15T18:51:36.158179"
+    "last_update": "2025-08-15T19:35:23.650095"
 }
\ No newline at end of file