erDiagram
    users {integer user_id varchar username timestamp review_datetime}
    events {integer event_id integer user_id timestamp event_datetime varchar event_type}
    google_auth {integer user_id timestamp last_accessed varchar google_token}
    password_auth {integer user_id timestamp last_accessed varchar email varchar password}
    review_notes {integer user_id timestamp review_datetime varchar notes}
    events }o--o{ users : "user_id"
    google_auth }o--o{ users : "user_id"
    password_auth }o--o{ users : "user_id"
    review_notes }o--o{ users : "user_id, review_datetime"