CREATE TABLE users (
	id SERIAL PRIMARY KEY,
	username VARCHAR(64) UNIQUE NOT NULL,
	pass_hash CHAR(128) NOT NULL,
	date_created TIMESTAMP WITHOUT TIME ZONE NOT NULL DEFAULT NOW()
)

CREATE TABLE collections (
	id SERIAL PRIMARY KEY,
	name VARCHAR(64),

	user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE
)

CREATE TABLE images (
	id SERIAL PRIMARY KEY,
	name VARCHAR(64) NOT NULL,
	description TEXT,
	extension VARCHAR(16) NOT NULL,

	collection_id INTEGER NOT NULL REFERENCES collections(id) ON DELETE CASCADE
)