build: Update ESLint to v9 (#16639)

packages/@n8n/db/eslint.config.mjs

@@ -0,0 +1,38 @@
+import { defineConfig } from 'eslint/config';
+import { baseConfig } from '@n8n/eslint-config/base';
+
+export default defineConfig(
+	baseConfig,
+	{
+		rules: {
+			'unicorn/filename-case': ['error', { case: 'kebabCase' }],
+
+			// TODO: Remove this
+			'@typescript-eslint/naming-convention': 'warn',
+			'@typescript-eslint/no-unsafe-member-access': 'warn',
+			'@typescript-eslint/no-unsafe-assignment': 'warn',
+			'@typescript-eslint/prefer-nullish-coalescing': 'warn',
+			'@typescript-eslint/unbound-method': 'warn',
+			'@typescript-eslint/no-base-to-string': 'warn',
+			'@typescript-eslint/require-await': 'warn',
+			'@typescript-eslint/no-unsafe-call': 'warn',
+			'@typescript-eslint/no-unsafe-function-type': 'warn',
+			'@typescript-eslint/no-empty-object-type': 'warn',
+			'@typescript-eslint/no-restricted-types': 'warn',
+			'no-useless-escape': 'warn',
+			'no-empty': 'warn',
+		},
+	},
+	{
+		files: ['**/*.test.ts', '**/__tests__/**/*.ts'],
+		rules: {
+			'@typescript-eslint/no-unsafe-return': 'warn',
+		},
+	},
+	{
+		files: ['./src/migrations/**/*.ts'],
+		rules: {
+			'unicorn/filename-case': 'off',
+		},
+	},
+);