Please configure a Postgresql instance in docker to accept requests on port 4121.
### 1. Install Docker
If you don't already have Docker installed on your machine, you can download it from the official Docker website [here](https://www.docker.com/products/docker-desktop).

### 2. Open a terminal window or command prompt
You'll need to open a terminal window or command prompt to run the following commands.

### 3. Pull the PostgreSQL image
Use the following command to pull the PostgreSQL image from Docker Hub:

```
docker pull postgres
```


### 4. Create a Docker container with the PostgreSQL image
Use the following command to create a Docker container with the PostgreSQL image, setting the PostgreSQL password to "mysecretpassword" and mapping port 4121 on the host machine to port 5432 in the container:

```
docker run --name my-postgres -e POSTGRES_PASSWORD=mysecretpassword -p 4121:5432 -d postgres
```

### 5. Verify that the container is running
Use the following command to verify that the container is running:

```
docker ps
```


### 6. Connect to the PostgreSQL instance
Use the following command to connect to the PostgreSQL instance running in the Docker container:


```
psql -h localhost -p 4121 -U postgres
```


### 7. Execute SQL queries
Once you're connected to the PostgreSQL instance, you can execute SQL queries as you would with any other PostgreSQL database.