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/tool-docs/workflow_management/n8n-manage-datatable.ts

@@ -0,0 +1,109 @@
+import { ToolDocumentation } from '../types';
+
+export const n8nManageDatatableDoc: ToolDocumentation = {
+  name: 'n8n_manage_datatable',
+  category: 'workflow_management',
+  essentials: {
+    description: 'Manage n8n data tables and rows. Unified tool for table CRUD and row operations with filtering, pagination, and dry-run support.',
+    keyParameters: ['action', 'tableId', 'name', 'data', 'filter'],
+    example: 'n8n_manage_datatable({action: "createTable", name: "Contacts", columns: [{name: "email", type: "string"}]})',
+    performance: 'Fast (100-500ms)',
+    tips: [
+      'Table actions: createTable, listTables, getTable, updateTable, deleteTable',
+      'Row actions: getRows, insertRows, updateRows, upsertRows, deleteRows',
+      'Use dryRun: true to preview update/upsert/delete before applying',
+      'Filter supports: eq, neq, like, ilike, gt, gte, lt, lte conditions',
+      'Use returnData: true to get affected rows back from update/upsert/delete',
+      'Requires n8n enterprise or cloud with data tables feature'
+    ]
+  },
+  full: {
+    description: `**Table Actions:**
+- **createTable**: Create a new data table with optional typed columns
+- **listTables**: List all data tables (paginated)
+- **getTable**: Get table details and column definitions by ID
+- **updateTable**: Rename an existing table
+- **deleteTable**: Permanently delete a table and all its rows
+
+**Row Actions:**
+- **getRows**: List rows with filtering, sorting, search, and pagination
+- **insertRows**: Insert one or more rows (bulk)
+- **updateRows**: Update rows matching a filter condition
+- **upsertRows**: Update matching row or insert if none match
+- **deleteRows**: Delete rows matching a filter condition (filter required)
+
+**Filter System:** Used in getRows, updateRows, upsertRows, deleteRows
+- Combine conditions with "and" (default) or "or"
+- Conditions: eq, neq, like, ilike, gt, gte, lt, lte
+- Example: {type: "and", filters: [{columnName: "status", condition: "eq", value: "active"}]}
+
+**Dry Run:** updateRows, upsertRows, and deleteRows support dryRun: true to preview changes without applying them.`,
+    parameters: {
+      action: { type: 'string', required: true, description: 'Operation to perform' },
+      tableId: { type: 'string', required: false, description: 'Data table ID (required for all except createTable and listTables)' },
+      name: { type: 'string', required: false, description: 'For createTable/updateTable: table name' },
+      columns: { type: 'array', required: false, description: 'For createTable: column definitions [{name, type?}]. Types: string, number, boolean, date, json' },
+      data: { type: 'array|object', required: false, description: 'For insertRows: array of row objects. For updateRows/upsertRows: object with column values' },
+      filter: { type: 'object', required: false, description: 'Filter: {type?: "and"|"or", filters: [{columnName, condition, value}]}' },
+      limit: { type: 'number', required: false, description: 'For listTables/getRows: max results (1-100)' },
+      cursor: { type: 'string', required: false, description: 'For listTables/getRows: pagination cursor' },
+      sortBy: { type: 'string', required: false, description: 'For getRows: "columnName:asc" or "columnName:desc"' },
+      search: { type: 'string', required: false, description: 'For getRows: full-text search across string columns' },
+      returnType: { type: 'string', required: false, description: 'For insertRows: "count" (default), "id", or "all"' },
+      returnData: { type: 'boolean', required: false, description: 'For updateRows/upsertRows/deleteRows: return affected rows (default: false)' },
+      dryRun: { type: 'boolean', required: false, description: 'For updateRows/upsertRows/deleteRows: preview without applying (default: false)' },
+    },
+    returns: `Depends on action:
+- createTable: {id, name}
+- listTables: {tables, count, nextCursor?}
+- getTable: Full table object with columns
+- updateTable: Updated table object
+- deleteTable: Success message
+- getRows: {rows, count, nextCursor?}
+- insertRows: Depends on returnType (count/ids/rows)
+- updateRows: Update result with optional rows
+- upsertRows: Upsert result with action type
+- deleteRows: Delete result with optional rows`,
+    examples: [
+      '// Create a table\nn8n_manage_datatable({action: "createTable", name: "Contacts", columns: [{name: "email", type: "string"}, {name: "score", type: "number"}]})',
+      '// List all tables\nn8n_manage_datatable({action: "listTables"})',
+      '// Get table details\nn8n_manage_datatable({action: "getTable", tableId: "dt-123"})',
+      '// Rename a table\nn8n_manage_datatable({action: "updateTable", tableId: "dt-123", name: "New Name"})',
+      '// Delete a table\nn8n_manage_datatable({action: "deleteTable", tableId: "dt-123"})',
+      '// Get rows with filter\nn8n_manage_datatable({action: "getRows", tableId: "dt-123", filter: {filters: [{columnName: "status", condition: "eq", value: "active"}]}, limit: 50})',
+      '// Search rows\nn8n_manage_datatable({action: "getRows", tableId: "dt-123", search: "john", sortBy: "name:asc"})',
+      '// Insert rows\nn8n_manage_datatable({action: "insertRows", tableId: "dt-123", data: [{email: "a@b.com", score: 10}], returnType: "all"})',
+      '// Update rows (dry run)\nn8n_manage_datatable({action: "updateRows", tableId: "dt-123", filter: {filters: [{columnName: "score", condition: "lt", value: 5}]}, data: {status: "inactive"}, dryRun: true})',
+      '// Upsert a row\nn8n_manage_datatable({action: "upsertRows", tableId: "dt-123", filter: {filters: [{columnName: "email", condition: "eq", value: "a@b.com"}]}, data: {score: 15}, returnData: true})',
+      '// Delete rows\nn8n_manage_datatable({action: "deleteRows", tableId: "dt-123", filter: {filters: [{columnName: "status", condition: "eq", value: "deleted"}]}})',
+    ],
+    useCases: [
+      'Persist structured workflow data across executions',
+      'Store and query lookup tables for workflow logic',
+      'Bulk insert records from external data sources',
+      'Conditionally update records matching criteria',
+      'Upsert to maintain unique records by key column',
+      'Clean up old or invalid rows with filtered delete',
+      'Preview changes with dryRun before modifying data',
+    ],
+    performance: 'Table operations: 50-300ms. Row operations: 100-500ms depending on data size and filters.',
+    bestPractices: [
+      'Define column types upfront for schema consistency',
+      'Use dryRun: true before bulk updates/deletes to verify filter correctness',
+      'Use returnType: "count" (default) for insertRows to minimize response size',
+      'Use filter with specific conditions to avoid unintended bulk operations',
+      'Use cursor-based pagination for large result sets',
+      'Use sortBy for deterministic row ordering',
+    ],
+    pitfalls: [
+      'Requires N8N_API_URL and N8N_API_KEY configured',
+      'Feature only available on n8n enterprise or cloud plans',
+      'deleteTable permanently deletes all rows — cannot be undone',
+      'deleteRows requires a filter — cannot delete all rows without one',
+      'Column types cannot be changed after table creation via API',
+      'updateTable can only rename the table (no column modifications via public API)',
+      'projectId cannot be set via the public API — use the n8n UI',
+    ],
+    relatedTools: ['n8n_create_workflow', 'n8n_list_workflows', 'n8n_health_check'],
+  },
+};