launch.json

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Python: Attach",
      "type": "python",
      "request": "attach",
      "connect": {
        "host": "localhost",
        "port": 6789
      },
      "pathMappings": [
        {
          "localRoot": "${workspaceFolder}/backend",
          "remoteRoot": "/app/backend"
        }
      ],

    },
    {
      "name": "Docker: flask-dev - save_routes.py",
      "type": "docker",
      "request": "launch",
      "preLaunchTask": "docker-run: save_routes.py",
      "python": {
        "pathMappings": [
          {
            "localRoot": "${workspaceFolder}/backend",
            "remoteRoot": "/app/backend"
          }
        ],
        "projectType": "general"
      }
    }
  ]
}