CSV: Must have headers: ID, Date, Provider ID, Value, Type, Created At, Updated At
JSON: Array of objects with date, providerId, and value fields
Date format: ISO 8601 (YYYY-MM-DDTHH:mm:ss.sssZ) or YYYY-MM-DD
Note: All imported measurements will be set to type 'WEIGHT'. Duplicate data may be created if the same measurements are imported multiple times.