Hi Lynate,
I'm not sure what table you are talking about.
When you open OR, you can create a project, and you can import a CSV (or another format) into a table that is the main element of your new project. Is that the table you are talking about?
On the back-end, data is stored in files, and not a SQL database with SQL tables. So, there are no tables in the storing process, but the data values that compose the table of the project.
I personally never really worked with an IDE, I work straight with a text editor. So no, it is not mandatory to use an IDE.
For clustering, the back-end receives the command from an API request, and it computes the answer, and sends back a preview (more or less). This is the part that must be tweaked.
Regards,
Antoine