curl --request GET \
  --url https://api.ubicloud.com/project/{project_id}/postgres \
  --header 'Authorization: Bearer <token>'

{
  "count": 123,
  "items": [
    {
      "flavor": "<string>",
      "ha_type": "<string>",
      "id": "pgn30gjk1d1e2jj34v9x0dq4rp",
      "location": "<string>",
      "name": "<string>",
      "state": "<string>",
      "storage_size_gib": 123,
      "version": "<string>",
      "target_version": "<string>",
      "vm_size": "<string>",
      "maintenance_window_start_at": 123,
      "read_replica": true,
      "tags": [
        {
          "key": "<string>",
          "value": "<string>"
        }
      ],
      "target_storage_size_gib": 123,
      "target_vm_size": "<string>",
      "ca_certificates": "<string>",
      "parent": "<string>"
    }
  ]
}