CREATE TABLE sessions (
    id          UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id     UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    token_hash  TEXT NOT NULL UNIQUE,
    ip_address  INET,
    user_agent  TEXT NOT NULL DEFAULT '',
    expires_at  TIMESTAMPTZ NOT NULL,
    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_sessions_user_id ON sessions (user_id);
CREATE INDEX idx_sessions_expires_at ON sessions (expires_at);