curl --request DELETE \
  --url https://us.infisical.com/api/v1/app-connections/postgres/{connectionId}

{
  "appConnection": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "orgId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "app": "postgres",
    "method": "username-and-password",
    "credentials": {
      "host": "<string>",
      "database": "<string>",
      "port": 123,
      "username": "<string>",
      "sslEnabled": true,
      "sslRejectUnauthorized": true,
      "sslCertificate": "<string>"
    },
    "description": "<string>",
    "version": 1,
    "isPlatformManagedCredentials": false,
    "gatewayId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "projectId": "<string>",
    "credentialsHash": "<string>",
    "project": {
      "name": "<string>",
      "id": "<string>",
      "type": "<string>",
      "slug": "<string>"
    }
  }
}