User has datapoint submissions take "minutes to days"

logs show many things like

```
01-07 21:06:44.211 17811 21956 W NetworkUtilities: Got non-success http response Status: 422Method: POST URL: https://www.beeminder.com/api/v1/users/REDACTED/goals/REDACTED/datapoints.json, Response: {"errors":"Duplicate request"}, Params: [timestamp=1686813553, value=1.0, comment=REDACTED, requestid=REDACTED, access_token=REDACTED]
```