CREATE TABLE IF NOT EXISTS admin_sessions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    token_hash TEXT NOT NULL UNIQUE,
    expires_at TIMESTAMPTZ NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    last_seen_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_admin_sessions_user_id ON admin_sessions(user_id);
CREATE INDEX IF NOT EXISTS idx_admin_sessions_expires_at ON admin_sessions(expires_at);