Add flexibility to "inception" field in WikidataItem model

[mhpob]

The WikidataItem is current assumed to be represented by a standard date format:

• https://github.com/MapRVA/yesterdays/blob/trunk/subjects/models.py#L38
• https://github.com/MapRVA/yesterdays/blob/trunk/subjects/models.py#L128

However, Wikidata dates can be of a form like "1810s" or "17th century": https://www.wikidata.org/wiki/Help:Dates

As it stands, these data are not imported. It does not break the import process. See the Anne Carrington House subject in the MapRVA instance for reference (Wikidata page).

[mhpob]

Pertinent json

"P571": [
          {
            "mainsnak": {
              "snaktype": "value",
              "property": "P571",
              "hash": "86c94dd1f6cc8392f837d079f5e8bdb4fee99aca",
              "datavalue": {
                "value": {
                  "time": "+1810-00-00T00:00:00Z",
                  "timezone": 0,
                  "before": 0,
                  "after": 0,
                  "precision": 8,
                  "calendarmodel": "http://www.wikidata.org/entity/Q1985727"
                },
                "type": "time"
              },
              "datatype": "time"
            },
            "type": "statement",
            "qualifiers": {
              "P1319": [
                {
                  "snaktype": "value",
                  "property": "P1319",
                  "hash": "5d2a01b053b6f8c21ac6181384d3c498f67cc89b",
                  "datavalue": {
                    "value": {
                      "time": "+1810-00-00T00:00:00Z",
                      "timezone": 0,
                      "before": 0,
                      "after": 0,
                      "precision": 9,
                      "calendarmodel": "http://www.wikidata.org/entity/Q1985727"
                    },
                    "type": "time"
                  },
                  "datatype": "time"
                }
              ],
              "P1326": [
                {
                  "snaktype": "value",
                  "property": "P1326",
                  "hash": "80e841b0cb540ab1d22f16aa0555707769e5b110",
                  "datavalue": {
                    "value": {
                      "time": "+1813-00-00T00:00:00Z",
                      "timezone": 0,
                      "before": 0,
                      "after": 0,
                      "precision": 9,
                      "calendarmodel": "http://www.wikidata.org/entity/Q1985727"
                    },
                    "type": "time"
                  },
                  "datatype": "time"
                }
              ],

[mhpob]

Looking at it now, could it be that just the way that Wikidata represents years (YYYY-00-00) is the issue?

[jacobwhall]

🫠