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	datetime	not null, indexed, unique
profile_url	string
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

photos

column_name	data_type	details
id	integer	not null, primary key, indexed
title	string	not null, indexed
photographer_id	integer	not null, foreign key, indexed
image_url	string
created_at	datetime	not null
updated_at	datetime	not null

• photographer_id references users
• index on title
• index on photographer_id

follows

column_name	data_type	details
id	integer	not null, primary key, indexed
follower_id	integer	not null, foreign key, indexed, unique
following_id	integer	not null, foreign key, indexed, unique
created_at	datetime	not null
updated_at	datetime	not null

• follower_id references users
• following_id references users
• index on [:follower_id, :following_id], unique: true

likes

column_name	data_type	details
id	integer	not null, primary key, indexed
liker_id	integer	not null, foreign key, unique, indexed
photo_id	integer	not null, foreign key, unique, indexed
created_at	datetime	not null
updated_at	datetime	not null

• liker_id references users
• photo_id references photos
• index on [:liker_id, :photo_id], unique: true

comments

column_name	data_type	details
id	integer	not null, primary key, indexed
comment	text	not null
author_id	integer	not null, foreign key, indexed
photo_id	integer	not null, foreign key, indexed
parent_comment_id	integer	foreign key, indexed
image_url	string
created_at	datetime	not null
updated_at	datetime	not null

• author_id references users
• photo_id references photos
• parent_comment_id references comments
• index on [:author_id, :photo_id, :parent_comment_id]