graph_date in response missing or 0

[nilsnolde]

Here's what I did

Request a /v2 route, isochrone & matrix

---

Here's what I got

graph_date metadata, which I think is a super useful addition, is either 0 or missing.

Route:

        "engine": {
            "version": "6.0.0",
            "build_date": "2020-01-02T10:46:20Z",
            "graph_date": "0000-00-00T00:00:00Z"
        }

Isochrone & Matrix are lacking the graph_date entirely.

---

Here's what I was expecting

Correct graph_date