(This is a subtask of T288511: improve handling of dates - calendar models and precision)

• add meta_wikidata_value column:
  1. to the CSV file format
  2. to the database (relevant table)

• The column should be optional
• validation:
  • only “Time” properties are allowed
  • must contain a single item ID

Note: for more clarity, the new column contains a calendar item Id, that is only allowed rows with a time property. A time property is a property with the datatype “time”, like P569 or P585