m33k44

RethinkDB[0] looks like a "too good to be true" type of database. Anyone using it in production? What is your experience like? What are the pros and cons?

[0] https://rethinkdb.com

Lot of Silicon Valley bigwigs, including Elon Musk and Jack Dorsey, have heavily invested in cryptocurrency.

Will there be some cryptocurrency integration with Twitter? That could give cryptocurrency some sort of legitimacy because lot of politicians and government organisations use Twitter as a means of communication.

Say, I have following relation:

    (node A.uuid) -- [relation AB.uuid] --> (node B.uuid)

And I store history of a node, say `node A`, as follows:

    (node A.uuid) -- [has:{datetime,session}] --> (node A.history)
    (node A.history) -- [contains:{datetime, session, relation AB.x.uuid, to:node B.y.uuid}] --> (node A.n.uuid)
    :
    :
    (node A.history) -- [contains:{datetime, session, relation AB.p.uuid, to:node B.q.uuid}] --> (node A.0.uuid)

Is this a good approach to store history of a node in a graph database? What are the better ways to do this?

Also, how do I store the history of the relation/edge `relation AB`? Is it same as the node?

If I use graph database as the main DB, then what are the best practices for maintaining history for auditing?

With recent news about market melt-down, I was wondering what really has happened? Anyone with the knowledge please ELI5?

And what are the alternatives to RethinkDB?

If I install something like Wireshark, Fiddler or mitmproxy, will I be able to decrypt all HTTPS content flowing from my computer to the application server of interest? If yes, then how to secure web traffic against such activity?

And what is that new project where C++ is the main language? And what other languages and tech stack are you using in that project?

As a side-project I am developing a simple app to send short messages to subscribed users. The users will be able to respond to the messages either privately or publicly.

It is a simple app, but I am not web or mobile developer. So this will be a learning experience for me.

This is a mobile-first app. I am thinking of what software stack I should use. I have reduced the choices to the following:

frontend: Flutter, backend: REST + Wt + PostgreSQL

Or

frontend: Flutter, backend: GraphQL + Phoenix/Elixir + CouchDB

I am a C/C++ developer and familiar with Wt and little bit of REST and RDBMS. But I am not familiar with Flutter, PostgreSQL, GraphQL, Phoenix/Elixir and CouchDB.

What software stack should I use? I am leaning towards the first option as I am familiar with C/C++.

Say, I have this following relation:

output_value = (V0, V1, ..., Vn)

The output_value depends on the input values V0...Vn such that some values when reduced may increase the output_value, and some values when increased may decrease the output_value. On the otherhand, increasing some values may increase the output_value, and decreasing some values may decrease the output_value.

Each Vk value depends on two values Vk_X and Vk_Y. The change in these various Vk_X and Vk_Y values determine the value of Vk and hence affect the final output_value.

A very crude hypothetical example, where there is only one input value V0, could be:

pay_per_employee(V0) = profit(V0_X) / number_of_employees(V0_Y)

productivity = pay_per_employee

(There could be many values Vk that might affect the final productivity value, but I have shown just one value)

Other real-world example could be calculating credit score.

Is it possible to mathematically represent this type of relationship of multiple input values on the final output value? If yes, then what field of mathematics does this fall under?

Also, is there a way in mathematics to avoid divide-by-zero errors in equations?