CREATE TABLE users (
    id       SERIAL PRIMARY KEY,
    username TEXT NOT NULL UNIQUE,
    password TEXT NOT NULL,
    role     INTEGER NOT NULL,

    created_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
    last_active TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE posts (
    id           SERIAL PRIMARY KEY,
    tags         TEXT NOT NULL DEFAULT '',
    filename     TEXT NOT NULL,
    content_type TEXT NOT NULL,
    hash         TEXT NOT NULL,
    size         INTEGER NOT NULL,
    source       TEXT,

    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE tags (
    id          SERIAL PRIMARY KEY,
    name        TEXT NOT NULL UNIQUE,
    description TEXT NOT NULL
);