Recording ranges is not possible

[PaulKiddle]

1. UI - Add extra field & tooltip
   • Create Date component, name => name.year, name.month, name.day
   • Create eventDate component, name => name.start, name.end
2. Validation - Parse date & verify range
   • Feed into lib like https://github.com/datatypesjs/interval#readme
   • Convert to ISO 8601 date
3. Migration - Add/modify database field
   • Add eventDate field, keep year, month, day, range as backups
   • Convert existing dates to eventDate (check using db dump first)
4. Insert & update
   • Record both ydmr & eventDate for all fields
5. Fetch back from db on read