Postgres Database Schema

Users

Column Name	Data Type	Details
id	integer	not null, primary key
username	string	not null, indexed, unique
email	string	not null, indexed, unique
password_digest	string	not null
session_token	string	not null, indexed, unique
created_at	datetime	not null
updated_at	datetime	not null

• index on username, unique: true
• index on email, unique: true
• index on session_token, unique: true

// Index on foreign keys and columns that will be frequently searched by

Posts

Column Name	Data Type	Details
id	integer	not null, primary key
body	text	not null
author_id	integer	not null, indexed, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• index on author_id
• author_id references users

Comments

Column Name	Data Type	Details
id	integer	not null, primary key
body	text	not null
author_id	integer	not null, indexed, foreign key
post_id	integer	not null, indexed, foreign key
parent_comment_id	integer	optional, indexed, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• index on author_id
• index on parent_comment_id
• author_id references Users
• parent_comment_id references Posts

Friends

Column Name	Data Type	Details
id	integer	not null, primary key
user_id	integer	not null
friend_id	integer	not null, indexed, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• index on user_id
• user_id references Users
• index on friend_id
• friend_id references Users

BONUS

Likes

Column Name	Data Type	Details
id	integer	not null, primary key
like_id	integer	not null, indexed
like_type	string	not null, indexed
created_at	datetime	not null
updated_at	datetime	not null

• index on like_id
• like_id references Users, Posts, and Comments