fix(workflow): remove Ensure Sheet, handle creation in batchUpdate

Ensure Sheet node returned empty data blocking downstream nodes.
Now Build CSV + Payload handles everything in a single batchUpdate:
- Sheet exists: updateCells (clear) + pasteData
- Sheet missing: addSheet + updateCells + pasteData

No separate sheet creation node needed. hashCode(table_name)
generates deterministic sheetId for new sheets.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ImTotem

workflows/pg_sheets_sync.json

@@ -68,7 +68,7 @@
     },
     {
       "parameters": {
-        "jsCode": "const sheetsResponse = $('Get Sheet IDs').first().json;\nconst sheetMap = {};\nfor (const s of sheetsResponse.sheets) {\n  sheetMap[s.properties.title] = s.properties.sheetId;\n}\n\nconst tables = $('Any Changes?').all().map(i => i.json.table_name);\nconst result = tables.map(t => ({\n  json: { table_name: t, sheet_id: sheetMap[t] ?? null, exists: sheetMap[t] != null }\n}));\nreturn result;"
+        "jsCode": "const sheetsResponse = $('Get Sheet IDs').first().json;\nconst sheetMap = {};\nfor (const s of sheetsResponse.sheets) {\n  sheetMap[s.properties.title] = s.properties.sheetId;\n}\n\nconst tables = $('Any Changes?').all().map(i => i.json.table_name);\nconst result = tables.map(t => ({\n  json: { table_name: t, sheet_id: sheetMap[t] ?? null }\n}));\nreturn result;"
       },
       "id": "map-sheet-ids",
       "name": "Map Sheet IDs",
@@ -84,29 +84,6 @@
       "typeVersion": 3,
       "position": [1320, -100]
     },
-    {
-      "parameters": {
-        "operation": "create",
-        "documentId": {"__rl": true, "mode": "id", "value": "={{ $env.GOOGLE_SHEETS_ID }}"},
-        "title": "={{ $json.table_name }}"
-      },
-      "id": "sheets-create",
-      "name": "Ensure Sheet",
-      "type": "n8n-nodes-base.googleSheets",
-      "typeVersion": 4.7,
-      "position": [1540, -100],
-      "onError": "continueRegularOutput"
-    },
-    {
-      "parameters": {
-        "jsCode": "return [{ json: { table_name: $('Loop Over Tables').item.json.table_name, sheet_id: $('Loop Over Tables').item.json.sheet_id } }];"
-      },
-      "id": "passthrough",
-      "name": "Restore Context",
-      "type": "n8n-nodes-base.code",
-      "typeVersion": 2,
-      "position": [1760, -100]
-    },
     {
       "parameters": {
         "operation": "executeQuery",
@@ -117,17 +94,17 @@
       "name": "Dump Table",
       "type": "n8n-nodes-base.postgres",
       "typeVersion": 2.6,
-      "position": [1980, -100]
+      "position": [1540, -100]
     },
     {
       "parameters": {
-        "jsCode": "const rows = $input.all().map(i => i.json);\nconst tableName = $('Restore Context').first().json.table_name;\nlet sheetId = $('Restore Context').first().json.sheet_id;\n\nif (rows.length === 0) {\n  return [{ json: { _empty: true, table_name: tableName } }];\n}\n\nconst headers = Object.keys(rows[0]);\nconst csvLines = [headers.join(',')];\nfor (const row of rows) {\n  const line = headers.map(h => {\n    const v = String(row[h] ?? '');\n    if (v.includes(',') || v.includes('\"') || v.includes('\\n')) {\n      return '\"' + v.replace(/\"/g, '\"\"') + '\"';\n    }\n    return v;\n  }).join(',');\n  csvLines.push(line);\n}\n\nconst requests = [];\nif (sheetId != null) {\n  requests.push({ updateCells: { range: { sheetId: sheetId }, fields: 'userEnteredValue' } });\n}\nrequests.push({\n  pasteData: {\n    coordinate: { sheetId: sheetId ?? 0, rowIndex: 0, columnIndex: 0 },\n    data: csvLines.join('\\n'),\n    type: 'PASTE_NORMAL',\n    delimiter: ','\n  }\n});\n\nreturn [{ json: { _empty: false, table_name: tableName, body: { requests } } }];"
+        "jsCode": "const rows = $input.all().map(i => i.json);\nconst tableName = $('Loop Over Tables').item.json.table_name;\nlet sheetId = $('Loop Over Tables').item.json.sheet_id;\n\nif (rows.length === 0) {\n  return [{ json: { _empty: true } }];\n}\n\nfunction hashCode(s) {\n  let h = 0;\n  for (let i = 0; i < s.length; i++) h = ((h << 5) - h) + s.charCodeAt(i) | 0;\n  return Math.abs(h);\n}\n\nconst headers = Object.keys(rows[0]);\nconst csvLines = [headers.join(',')];\nfor (const row of rows) {\n  csvLines.push(headers.map(h => {\n    const v = String(row[h] ?? '');\n    return (v.includes(',') || v.includes('\"') || v.includes('\\n')) ? '\"' + v.replace(/\"/g, '\"\"') + '\"' : v;\n  }).join(','));\n}\n\nconst requests = [];\n\nif (sheetId == null) {\n  sheetId = hashCode(tableName);\n  requests.push({ addSheet: { properties: { sheetId, title: tableName } } });\n}\nrequests.push({ updateCells: { range: { sheetId }, fields: 'userEnteredValue' } });\nrequests.push({ pasteData: { coordinate: { sheetId, rowIndex: 0, columnIndex: 0 }, data: csvLines.join('\\n'), type: 'PASTE_NORMAL', delimiter: ',' } });\n\nreturn [{ json: { _empty: false, body: { requests } } }];"
       },
       "id": "to-csv",
       "name": "Build CSV + Payload",
       "type": "n8n-nodes-base.code",
       "typeVersion": 2,
-      "position": [2200, -100]
+      "position": [1760, -100]
     },
     {
       "parameters": {
@@ -142,7 +119,7 @@
       "name": "Has Rows?",
       "type": "n8n-nodes-base.if",
       "typeVersion": 2.3,
-      "position": [2420, -100]
+      "position": [1980, -100]
     },
     {
       "parameters": {
@@ -159,7 +136,7 @@
       "name": "Paste to Sheet",
       "type": "n8n-nodes-base.httpRequest",
       "typeVersion": 4.2,
-      "position": [2640, -200]
+      "position": [2200, -200]
     }
   ],
   "connections": {
@@ -169,9 +146,7 @@
     "Any Changes?": {"main": [[{"node": "Get Sheet IDs", "type": "main", "index": 0}], []]},
     "Get Sheet IDs": {"main": [[{"node": "Map Sheet IDs", "type": "main", "index": 0}]]},
     "Map Sheet IDs": {"main": [[{"node": "Loop Over Tables", "type": "main", "index": 0}]]},
-    "Loop Over Tables": {"main": [[], [{"node": "Ensure Sheet", "type": "main", "index": 0}]]},
-    "Ensure Sheet": {"main": [[{"node": "Restore Context", "type": "main", "index": 0}]]},
-    "Restore Context": {"main": [[{"node": "Dump Table", "type": "main", "index": 0}]]},
+    "Loop Over Tables": {"main": [[], [{"node": "Dump Table", "type": "main", "index": 0}]]},
     "Dump Table": {"main": [[{"node": "Build CSV + Payload", "type": "main", "index": 0}]]},
     "Build CSV + Payload": {"main": [[{"node": "Has Rows?", "type": "main", "index": 0}]]},
     "Has Rows?": {"main": [[{"node": "Paste to Sheet", "type": "main", "index": 0}], [{"node": "Loop Over Tables", "type": "main", "index": 0}]]},