/**
 * Validate a session ID and return user info if valid
 * @param client Database client
 * @param session_id Session ID to validate
 * @returns Validation result with user info if valid
 */
export const validateSession = async (client, session_id) => {
    if (!session_id || session_id.trim().length === 0) {
        return { valid: false };
    }
    const result = await client.query(`SELECT s.session_id, s.user_id, s.expires_at, u.username
     FROM sessions s
     JOIN users u ON s.user_id = u.id
     WHERE s.session_id = $1 AND s.expires_at > NOW()`, [session_id]);
    if (result.rows.length === 0) {
        return { valid: false };
    }
    const session = result.rows[0];
    return {
        valid: true,
        user_id: session.user_id,
        username: session.username,
        session_id: session.session_id,
        expires_at: session.expires_at,
    };
};
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