fix: resolve TypeScript and linting errors in test infrastructure

- Add @types/better-sqlite3 dependency
- Remove duplicate database mock file
- Fix property spread order in workflow builder to prevent overwrites
- All 75 tests now pass with no linting errors

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/unit/database/__mocks__/database.mock.ts

@@ -1,149 +0,0 @@
-import { vi } from 'vitest';
-import type { Database } from 'better-sqlite3';
-
-export interface MockDatabase extends Partial<Database> {
-  prepare: ReturnType<typeof vi.fn>;
-  exec: ReturnType<typeof vi.fn>;
-  close: ReturnType<typeof vi.fn>;
-  transaction: ReturnType<typeof vi.fn>;
-  pragma: ReturnType<typeof vi.fn>;
-  backup: ReturnType<typeof vi.fn>;
-  serialize: ReturnType<typeof vi.fn>;
-  function: ReturnType<typeof vi.fn>;
-  aggregate: ReturnType<typeof vi.fn>;
-  table: ReturnType<typeof vi.fn>;
-  loadExtension: ReturnType<typeof vi.fn>;
-  defaultSafeIntegers: ReturnType<typeof vi.fn>;
-  unsafeMode: ReturnType<typeof vi.fn>;
-}
-
-export interface MockStatement {
-  run: ReturnType<typeof vi.fn>;
-  get: ReturnType<typeof vi.fn>;
-  all: ReturnType<typeof vi.fn>;
-  iterate: ReturnType<typeof vi.fn>;
-  pluck: ReturnType<typeof vi.fn>;
-  expand: ReturnType<typeof vi.fn>;
-  raw: ReturnType<typeof vi.fn>;
-  columns: ReturnType<typeof vi.fn>;
-  bind: ReturnType<typeof vi.fn>;
-  safeIntegers: ReturnType<typeof vi.fn>;
-}
-
-export function createMockDatabase(): MockDatabase {
-  const mockDb: MockDatabase = {
-    prepare: vi.fn(),
-    exec: vi.fn(),
-    close: vi.fn(),
-    transaction: vi.fn(),
-    pragma: vi.fn(),
-    backup: vi.fn(),
-    serialize: vi.fn(),
-    function: vi.fn(),
-    aggregate: vi.fn(),
-    table: vi.fn(),
-    loadExtension: vi.fn(),
-    defaultSafeIntegers: vi.fn(),
-    unsafeMode: vi.fn(),
-    memory: false,
-    readonly: false,
-    name: ':memory:',
-    open: true,
-    inTransaction: false,
-  };
-
-  // Setup default behavior
-  mockDb.transaction.mockImplementation((fn: Function) => {
-    return (...args: any[]) => fn(...args);
-  });
-
-  mockDb.pragma.mockReturnValue(undefined);
-
-  return mockDb;
-}
-
-export function createMockStatement(defaultResults: any = []): MockStatement {
-  const mockStmt: MockStatement = {
-    run: vi.fn().mockReturnValue({ changes: 1, lastInsertRowid: 1 }),
-    get: vi.fn().mockReturnValue(defaultResults[0] || undefined),
-    all: vi.fn().mockReturnValue(defaultResults),
-    iterate: vi.fn().mockReturnValue(defaultResults[Symbol.iterator]()),
-    pluck: vi.fn().mockReturnThis(),
-    expand: vi.fn().mockReturnThis(),
-    raw: vi.fn().mockReturnThis(),
-    columns: vi.fn().mockReturnValue([]),
-    bind: vi.fn().mockReturnThis(),
-    safeIntegers: vi.fn().mockReturnThis(),
-  };
-
-  return mockStmt;
-}
-
-export function setupDatabaseMock(mockDb: MockDatabase, queryResults: Record<string, any> = {}) {
-  mockDb.prepare.mockImplementation((query: string) => {
-    // Match queries to results
-    for (const [pattern, result] of Object.entries(queryResults)) {
-      if (query.includes(pattern)) {
-        return createMockStatement(Array.isArray(result) ? result : [result]);
-      }
-    }
-    // Default mock statement
-    return createMockStatement();
-  });
-}
-
-// Helper to create a mock node repository
-export function createMockNodeRepository() {
-  return {
-    getNodeByType: vi.fn(),
-    searchNodes: vi.fn(),
-    listNodes: vi.fn(),
-    getNodeEssentials: vi.fn(),
-    getNodeDocumentation: vi.fn(),
-    getNodeInfo: vi.fn(),
-    searchNodeProperties: vi.fn(),
-    listAITools: vi.fn(),
-    getNodeForTask: vi.fn(),
-    listTasks: vi.fn(),
-    getDatabaseStatistics: vi.fn(),
-    close: vi.fn(),
-  };
-}
-
-// Helper to create mock node data
-export function createMockNode(overrides: any = {}) {
-  return {
-    id: 1,
-    package_name: 'n8n-nodes-base',
-    node_type: 'n8n-nodes-base.webhook',
-    display_name: 'Webhook',
-    description: 'Starts the workflow when a webhook is called',
-    version: 2,
-    defaults: JSON.stringify({ name: 'Webhook' }),
-    properties: JSON.stringify([]),
-    credentials: JSON.stringify([]),
-    inputs: JSON.stringify(['main']),
-    outputs: JSON.stringify(['main']),
-    type_version: 2,
-    is_trigger: 1,
-    is_regular: 0,
-    is_webhook: 1,
-    webhook_path: '/webhook',
-    full_metadata: JSON.stringify({}),
-    created_at: new Date().toISOString(),
-    updated_at: new Date().toISOString(),
-    ...overrides,
-  };
-}
-
-// Helper to create mock query results
-export function createMockQueryResults() {
-  return {
-    'SELECT * FROM nodes WHERE node_type = ?': createMockNode(),
-    'SELECT COUNT(*) as count FROM nodes': { count: 525 },
-    'SELECT * FROM nodes WHERE display_name LIKE ?': [
-      createMockNode({ node_type: 'n8n-nodes-base.slack', display_name: 'Slack' }),
-      createMockNode({ node_type: 'n8n-nodes-base.webhook', display_name: 'Webhook' }),
-    ],
-  };
-}