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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
On @RemindMe_OfThis, I store the user's chosen timezone, a flag to enable push notifications and the Firebase notification token.
On @this_vid, I store the push notification flag and Firebase token. An important detail: on both of these systems, a "user" is a Twitter user. My app doesn't handle any user management or store any user accounts. Authentication is handled by Twitter.
Yep. In a small Slack app I built for my previous workplace, I used a Google Sheet to store user tokens for updating their Slack profile.
Files are the most flexible of all. They can store anything in any format you want, but you have to write the querying logic yourself, so it's best to stick to simple formats and don't use them for data where you need complex queries. I think sticking with simple data that fits in a key=value format or JSON (like lowdb) is best.
I then pass the engineResponseTimes to the view and use Chart.js to render it into a chart.