feat: add n8n_manage_datatable MCP tool with full CRUD (#640) (#650)

* feat: add n8n_create_data_table MCP tool and projectId for create workflow (#640)

Add new MCP tool to create n8n data tables via the REST API:
- n8n_create_data_table tool definition with name + columns schema
- handleCreateDataTable handler with Zod validation and N8nApiError handling
- N8nApiClient.createDataTable() calling POST /data-tables
- DataTable, DataTableColumn, DataTableColumnResponse types per OpenAPI spec
- Column types: string | number | boolean | date | json
- Input validation: .min(1) on table name and column names
- Tool documentation with examples, use cases, and pitfalls

Also adds projectId parameter to n8n_create_workflow for enterprise
project support, and fixes stale management tool count in health check.

Based on work by @djakielski in PR #646.
Co-Authored-By: Dominik Jakielski <dominik.jakielski@urlaubsguru.de>

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

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

* feat: replace n8n_create_data_table with n8n_manage_datatable (10 actions)

Replaces the single-purpose n8n_create_data_table tool with a comprehensive
n8n_manage_datatable tool covering all 10 n8n data table API endpoints:

Table operations: createTable, listTables, getTable, updateTable, deleteTable
Row operations: getRows, insertRows, updateRows, upsertRows, deleteRows

- Filter system with and/or logic and 8 condition operators
- Dry-run support for updateRows, upsertRows, deleteRows
- Pagination, sorting, and full-text search for row listing
- 9 new N8nApiClient methods for all data table endpoints
- Shared error handler and consolidated Zod schemas
- Comprehensive tool documentation with examples per action
- 36 handler tests + 18 API client tests

BREAKING: n8n_create_data_table removed. Use n8n_manage_datatable with
action="createTable" instead.

Based on work by @djakielski in PR #646.
Co-Authored-By: Dominik Jakielski <dominik.jakielski@urlaubsguru.de>

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

src/mcp/tools-n8n-manager.ts

@@ -63,6 +63,10 @@ export const n8nManagementTools: ToolDefinition[] = [
             executionTimeout: { type: 'number' },
             errorWorkflow: { type: 'string' }
           }
+        },
+        projectId: {
+          type: 'string',
+          description: 'Optional project ID to create the workflow in (enterprise feature)'
         }
       },
       required: ['name', 'nodes', 'connections']
@@ -602,5 +606,52 @@ export const n8nManagementTools: ToolDefinition[] = [
       destructiveHint: false,
       openWorldHint: true,
     },
-  }
+  },
+  {
+    name: 'n8n_manage_datatable',
+    description: `Manage n8n data tables and rows. Actions: createTable, listTables, getTable, updateTable, deleteTable, getRows, insertRows, updateRows, upsertRows, deleteRows. Requires n8n enterprise/cloud with data tables feature.`,
+    inputSchema: {
+      type: 'object',
+      properties: {
+        action: {
+          type: 'string',
+          enum: ['createTable', 'listTables', 'getTable', 'updateTable', 'deleteTable', 'getRows', 'insertRows', 'updateRows', 'upsertRows', 'deleteRows'],
+          description: 'Operation to perform',
+        },
+        tableId: { type: 'string', description: 'Data table ID (required for all actions except createTable and listTables)' },
+        name: { type: 'string', description: 'For createTable/updateTable: table name' },
+        columns: {
+          type: 'array',
+          description: 'For createTable: column definitions',
+          items: {
+            type: 'object',
+            properties: {
+              name: { type: 'string' },
+              type: { type: 'string', enum: ['string', 'number', 'boolean', 'date', 'json'] },
+            },
+            required: ['name'],
+          },
+        },
+        data: { description: 'For insertRows: array of row objects. For updateRows/upsertRows: object with column values.' },
+        filter: {
+          type: 'object',
+          description: 'For getRows/updateRows/upsertRows/deleteRows: {type?: "and"|"or", filters: [{columnName, condition, value}]}',
+        },
+        limit: { type: 'number', description: 'For listTables/getRows: max results (1-100)' },
+        cursor: { type: 'string', description: 'For listTables/getRows: pagination cursor' },
+        sortBy: { type: 'string', description: 'For getRows: "columnName:asc" or "columnName:desc"' },
+        search: { type: 'string', description: 'For getRows: text search across string columns' },
+        returnType: { type: 'string', enum: ['count', 'id', 'all'], description: 'For insertRows: what to return (default: count)' },
+        returnData: { type: 'boolean', description: 'For updateRows/upsertRows/deleteRows: return affected rows (default: false)' },
+        dryRun: { type: 'boolean', description: 'For updateRows/upsertRows/deleteRows: preview without applying (default: false)' },
+      },
+      required: ['action'],
+    },
+    annotations: {
+      title: 'Manage Data Tables',
+      readOnlyHint: false,
+      destructiveHint: true,
+      openWorldHint: true,
+    },
+  },
 ];