Hi @mwfiae, thanks for your report. I worked on that part of Steem-plus and I apparently did a smaaaaall mistake haha.
I just want to clarify a point. When you say It is also possible (by creating a few requests in parallel) that some of the points are missing or doubled in the database, depending on the exact moment this is attempted., it is actually not possible to double your points because we only proceed data created after the last entry of our database. We decided to execute the job once every hour at first not to overload our server, but we could have done it every 5 minutes. :)
RE: [Steemplus API] [v1.0] [Bug-Report] DOS Vulnerability in the API caused by the SPP-Job