# Entities

```mermaid
erDiagram
    Account ||--|| Profile : "has"
    Account ||--o{ Session : "creates"
    Profile ||--o{ Follow : "follows"
    Profile ||--o{ Follow : "is followed by"
    Profile ||--o{ Like : "likes"
    Profile {
        string ap_id PK
        string username
        string description
        string inbox
        string outbox
        enum type
        string picture
        string public_key
        string private_key
        timestamp created_at
        timestamp last_refreshed_at
    }
    Account {
        string ap_id FK
        string oauth_provider_id PK
        string oauth_provider_user_id PK
        string email
    }
    Session {
        string id PK
        timestamp expires_at
        string ap_id FK
    }
    Follow {
        string follower_ap_id
        string following_ap_id
        timestamp created_at
    }
    Like {
        string ap_id PK
        string object_id PK
        timestamp created_at
    }
```

Profile.type is an enum supporting the ActivityPub actor type [values](https://www.w3.org/TR/activitystreams-vocabulary/#actor-types)