CREATE TABLE IF NOT EXISTS users (
    id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    username TEXT NOT NULL UNIQUE,
    email TEXT NOT NULL UNIQUE,
    password_hash TEXT NOT NULL,
    password_salt TEXT NOT NULL,
    first_name TEXT NOT NULL,
    last_name TEXT NOT NULL,
    display_name TEXT,
    date_of_birth DATE,
    phone_number TEXT,

    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    last_login_at TIMESTAMPTZ,
    
    -- i64 bitfield for permissions
    permissions BIGINT NOT NULL DEFAULT 0
)