Delete firebase data older than 2 hours

Question

I would like to delete data that is older than two hours. Currently, on the client-side, I loop through all the data and run a delete on the outdated data. When I do this, t

Answer 1

I have a http triggered cloud function that deletes nodes, depending on when they were created and their expiration date.

When I add a node to the database, it needs two fields: timestamp to know when it was created, and duration to know when the offer must expire.

Then, I have this http triggered cloud function:

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

/**
 * @function HTTP trigger that, when triggered by a request, checks every message of the database to delete the expired ones.
 * @type {HttpsFunction}
 */
exports.removeOldMessages = functions.https.onRequest((req, res) => {
    const timeNow = Date.now();
    const messagesRef = admin.database().ref('/messages');
    messagesRef.once('value', (snapshot) => {
        snapshot.forEach((child) => {
            if ((Number(child.val()['timestamp']) + Number(child.val()['duration'])) <= timeNow) {
                child.ref.set(null);
            }
        });
    });
    return res.status(200).end();
});

You can create a cron job that every X minutes makes a request to the URL of that function: https://cron-job.org/en/

But I prefer to run my own script, that makes a request every 10 seconds:

watch -n10 curl -X GET https://(your-zone)-(your-project-id).cloudfunctions.net/removeOldMessages