Optimizing Schema Duplication for Optional Fields

export class TemporalTable extends S.Class<TemporalTable>('TemporalTable')({
  id: TemporalId,
  attributionId: AttributionId,
  createdAt: SqliteDateTime,
  start: S.NullOr(SqliteDateTime),
  startPrecision: Precision,
  end: S.NullOr(SqliteDateTime),
  endPrecision: Precision,
  ordinal: S.NullOr(S.Number)
}) {}

export class InsertTemporalParams extends S.Class<InsertTemporalParams>('InsertTemporalParams') ({
  id: S.optional(TemporalId, { default: () => makeId('Temporal')}),
  attributionId: S.optional(AttributionId, { default: () => makeId('Attribution') }),
  createdAt: S.optional(SqliteDateTime, { default: sqliteDateTimeNow }),
  start: S.optional(S.NullOr(SqliteDateTime), { default: () => null }),
  startPrecision: S.optional(Precision, { default: () => 'empty'}),
  end: S.optional(S.NullOr(SqliteDateTime), { default: () => null }),
  endPrecision: S.optional(Precision, { default: () => 'empty'}),
  ordinal: S.optional(S.NullOr(S.Number), { default: () => null })
}) {}