linstrom/frontend-reactive/app/models/relation.ts

import Model, { attr } from '@ember-data/model'

export default class Relation extends Model {
  @attr declare createdAt: Date
  @attr declare updatedAt: Date
  @attr declare fromId: string
  @attr declare toId: string
  @attr declare requested: boolean
  @attr declare accepted: boolean
}

declare module 'ember-data/types/registries/model' {
  export default interface ModelRegistry {
    relation: Relation
  }
}