feat(09-02): add loop over items for sequential batch execution

- Add Initialize Batch State code node to prepare batch data
- Add Send Batch Start Message to show initial progress
- Add Prepare Batch Loop to format containers for iteration
- Add Batch Loop (splitInBatches) for sequential processing
- Connect Route Batch Action outputs (update/start/restart) to batch flow

n8n-workflow.json

@@ -4412,6 +4412,65 @@
         2000,
         600
       ]
+    },
+    {
+      "parameters": {
+        "jsCode": "// Initialize batch state for execution\n// Input comes from Route Batch Action OR batch callbacks (bexec, bstop confirmed)\nconst data = $json;\n\n// Handle different input sources\nlet containers, action, chatId, messageId;\n\nif (data.allMatched) {\n  // From Route Batch Action (direct batch command)\n  containers = data.allMatched;\n  action = data.action;\n  chatId = data.chatId;\n  messageId = data.messageId || null;\n} else if (data.containerNames) {\n  // From batch callback (bexec or bstop:confirm)\n  // Need to resolve names to container objects\n  containers = data.containerNames.map(name => ({ Name: name, Id: null }));\n  action = data.batchAction || 'stop';\n  chatId = data.chatId;\n  messageId = data.messageId;\n} else {\n  throw new Error('Invalid batch state input');\n}\n\nreturn {\n  json: {\n    containers: containers,\n    action: action,\n    totalCount: containers.length,\n    successCount: 0,\n    failureCount: 0,\n    warningCount: 0,\n    results: [],\n    chatId: chatId,\n    messageId: messageId,\n    currentIndex: 0,\n    progressMessageId: null\n  }\n};"
+      },
+      "id": "code-init-batch-state",
+      "name": "Initialize Batch State",
+      "type": "n8n-nodes-base.code",
+      "typeVersion": 2,
+      "position": [
+        2440,
+        -500
+      ]
+    },
+    {
+      "parameters": {
+        "method": "POST",
+        "url": "=https://api.telegram.org/bot{{ $env.TELEGRAM_BOT_TOKEN }}/sendMessage",
+        "sendBody": true,
+        "specifyBody": "json",
+        "jsonBody": "={{ JSON.stringify({ chat_id: $json.chatId, text: '<b>Batch ' + $json.action + '</b>\\n\\nStarting ' + $json.action + ' for ' + $json.totalCount + ' containers...', parse_mode: 'HTML' }) }}",
+        "options": {}
+      },
+      "id": "http-send-batch-start",
+      "name": "Send Batch Start Message",
+      "type": "n8n-nodes-base.httpRequest",
+      "typeVersion": 4.2,
+      "position": [
+        2660,
+        -500
+      ]
+    },
+    {
+      "parameters": {
+        "jsCode": "// Store progress message ID and prepare containers for loop\nconst batchState = $('Initialize Batch State').item.json;\nconst response = $json;\n\n// Get message_id from Telegram response\nconst progressMessageId = response.result?.message_id || null;\n\n// Return array of items for the loop - each container as separate item\nconst items = batchState.containers.map((container, index) => ({\n  json: {\n    container: container,\n    containerIndex: index,\n    action: batchState.action,\n    totalCount: batchState.totalCount,\n    chatId: batchState.chatId,\n    progressMessageId: progressMessageId,\n    // Running totals - will be updated as loop progresses\n    successCount: 0,\n    failureCount: 0,\n    warningCount: 0,\n    results: []\n  }\n}));\n\nreturn items;"
+      },
+      "id": "code-prepare-batch-loop",
+      "name": "Prepare Batch Loop",
+      "type": "n8n-nodes-base.code",
+      "typeVersion": 2,
+      "position": [
+        2880,
+        -500
+      ]
+    },
+    {
+      "parameters": {
+        "options": {
+          "reset": false
+        }
+      },
+      "id": "loop-batch",
+      "name": "Batch Loop",
+      "type": "n8n-nodes-base.splitInBatches",
+      "typeVersion": 3,
+      "position": [
+        3100,
+        -500
+      ]
     }
   ],
   "connections": {
@@ -5725,9 +5784,27 @@
     },
     "Route Batch Action": {
       "main": [
-        [],
-        [],
-        [],
+        [
+          {
+            "node": "Initialize Batch State",
+            "type": "main",
+            "index": 0
+          }
+        ],
+        [
+          {
+            "node": "Initialize Batch State",
+            "type": "main",
+            "index": 0
+          }
+        ],
+        [
+          {
+            "node": "Initialize Batch State",
+            "type": "main",
+            "index": 0
+          }
+        ],
         [
           {
             "node": "Build Batch Stop Confirmation",
@@ -6391,6 +6468,39 @@
           }
         ]
       ]
+    },
+    "Initialize Batch State": {
+      "main": [
+        [
+          {
+            "node": "Send Batch Start Message",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    },
+    "Send Batch Start Message": {
+      "main": [
+        [
+          {
+            "node": "Prepare Batch Loop",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    },
+    "Prepare Batch Loop": {
+      "main": [
+        [
+          {
+            "node": "Batch Loop",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
     }
   },
   "pinData": {},