Again, it's just about the data structure, which was useful, but I'd really like to get a feedback like "ok, I won't delete any more data". Unfortunately, this conversation will never be useful for both of us, as I have wanted to achieve this since January, but you avoid responding. The funny thing is that I understand what you write from the first moment, but you don't respond to what I ask.
The reason for combining the data of several cycles is that there is a lot of data that comes from several sources, so it has to be uploaded individually, it is not possible to speed up their transfer to Wikidata with a bot or QuickStatements. Therefore, the duration of data entry must be shortened. If there is no change during the representative mandate (he is elected in the same electoral district, he is represented by the same party, he does not switch to another faction, he does not interrupt his mandate), then there is a good chance that the data of several cycles will be entered in the same P39. If there is a change in any of the mentioned data, I separate the cycles. I have to come up with an optimal solution not only for today's and recent political elections, but also for the 15,000 mandates of more than 40 national election cycles of 175 years. When all the data is uploaded and the accompanying data is clarified, they can be separated with a bot (if anyone has the capacity to do so).
About P2715: I may be narrow-minded, but I find it almost impossible to have precise data for P2715 for any country. Here, one must think not only of the national parliamentary elections, but also of the regional and/or interim elections of one hundred to one hundred and fifty years ago, i.e. all electoral events through which a representative is elected to the parliament. It is also necessary to prepare for the registration of the data of the repeated elections ordered as a result of the successfully appealed results, that is, within a legislative cycle, the data of approximately 20-30 (or even more) elections should be available, which in the case of Hungary - also in terms of magnitude - should be more than a thousand election elements, so that the P2715 can be used. There are data on 42 cycles in Hungary, 58 in the United Kingdom, and 120 cycles in the United States, with an unimaginable number of elections: do you think it is really a realistic expectation that there should be an element for each of these? Are there any historical sources for all the small local by-elections that got representatives into parliament? If, on the other hand, there is no element about every choice, isn't it a conceptual error to build the data structure on that? I'm afraid - at least that's how I see it at the moment - I won't be the one to bring up the elements of all the Hungarian elections that will allow P2715 to be used.
You are right that P5054 is not used by the Q111475445 list, but this also has its drawback: I could not compile the composition of the historical counter-governments (governments operating in overlapping periods). Although I only tried in relation to Hungary, are you sure that it is possible to compile a list of the governments of the period of the Spanish Civil War, or the governments of any occupied country during the Second World War, without using P5054? But regardless of whether it succeeds or not, I use P5054 in various queries for data entry and verification, and that's reason enough to expect another user not to delete this feature. I hope you also sense the contradiction: you warn that certain queries won't work for adding representative seats with a combined legislative cycle, then delete data that my queries REALLY won't work with.
Thank you for pointing out the incomplete data - all the more so because there are some that refer to a term that I myself thought was accurate (post-2002). It is always possible to improve, but if you delete data in a randomly way, you make the other person's job extremely difficult, so I ask (not for the first time) not to do this.