Decoding Unknown Values - I'm Stuck!

type MessageRow = {
  parts: unknown
  annotations: unknown
  role: string
  threadId: number
  publicId: string
}

const Message = Schema.Struct({
  parts: Schema.Array(Schema.Object),
  annotations: Schema.Array(Schema.Object),
  role: Schema.String,
  threadId: Schema.Number,
  publicId: Schema.String,
})

const DatabaseMessage = Schema.Struct({
  parts: Schema.Unknown,
  annotations: Schema.Unknown,
  role: Schema.String,
  threadId: Schema.Number,
  publicId: Schema.String,
})