what is the use case of kv metadata ?

export const createSession = async (user: any, databaseConfig: KVNamespace) => {
    let absoluteExpiration = 30 * 24 * 60 * 60;
    let expiration = new TimeSpan(10, 'd');
    const sid = generateRandomString(60, alphabet('a-z', '0-9'));

    const SessionBody = {
        email: user.email,
        email_verified: user.email_verified,
        expires_at: expiration,
    };
    try {
        await databaseConfig.put(sid, user.id, { metadata: SessionBody, expirationTtl: absoluteExpiration });
    } catch (error) {
        throw new Error('Error creating session');
    }

    return sid;
};

export const createSession = async (user: any, databaseConfig: KVNamespace) => {
    let absoluteExpiration = 30 * 24 * 60 * 60;
    let expiration = new TimeSpan(10, 'd');
    const sid = generateRandomString(60, alphabet('a-z', '0-9'));

    const SessionBody = {
        email: user.email,
        email_verified: user.email_verified,
        expires_at: expiration,
    };
    try {
        await databaseConfig.put(sid, user.id, { metadata: SessionBody, expirationTtl: absoluteExpiration });
    } catch (error) {
        throw new Error('Error creating session');
    }

    return sid;
};

import { GetGuid, CheckAuth } from '../../util/Util';

import { GetGuid, CheckAuth } from '../../util/Util';

export async function CheckAuth(env, walletID){
    console.log(walletID)
    console.log(env.SESSION.get)
    try{
        const sid = await env.SESSION.get(walletID)
        console.log(sid)
    }
    catch(ex){
        console.log(ex)
    }
    console.log("SID")
}

export async function CheckAuth(env, walletID){
    console.log(walletID)
    console.log(env.SESSION.get)
    try{
        const sid = await env.SESSION.get(walletID)
        console.log(sid)
    }
    catch(ex){
        console.log(ex)
    }
    console.log("SID")
}

console.log(env)

console.log(env)