CREATE TABLE "repository" (
    id uuid PRIMARY KEY NOT NULL,
    url varchar(255) UNIQUE NOT NULL,
    created_at timestamp NOT NULL,
    updated_at timestamp NOT NULL,
    uploader_ip varchar(15) NOT NULL
);

CREATE TABLE "email"(
    email varchar(120) PRIMARY KEY NOT NULL,
    hash_md5 varchar(32) UNIQUE NOT NULL
);

CREATE TABLE "commit" (
    hash varchar(40) PRIMARY KEY NOT NULL,
    tree varchar(40) REFERENCES commit(hash) NULL,
    text text NOT NULL,
    date timestamp NOT NULL,
    author_email varchar(120) REFERENCES email(email) NOT NULL,
    author_name varchar(120) NOT NULL,
    committer_email varchar(120) REFERENCES email(email) NOT NULL,
    committer_name varchar(120) NOT NULL,
    repository_url varchar(256) REFERENCES repository(url) NOT NULL 
);

CREATE TABLE "branch" (
    id uuid PRIMARY KEY NOT NULL,
    name varchar(120) NOT NULL,
    repository_id uuid REFERENCES repository(id) NOT NULL,
    head varchar(40) REFERENCES commit(hash) NULL
);