fix: configure test typings and root database linting

angular.json

@@ -122,7 +122,7 @@
         "lint": {
           "builder": "@angular-eslint/builder:lint",
           "options": {
-            "lintFilePatterns": ["src/**/*.ts", "src/**/*.html"]
+            "lintFilePatterns": ["src/**/*.ts", "src/**/*.html", "db.ts"]
           }
         }
       }