Completely off-topic question, but, does anyone more knowledgeable about academia know why bascially no paper states the date of writing/publication clearly? Is it because the publication may be delayed?

I've read or at least downloaded many of these VLDB and other DB papers and it's difficult to get the year it was written at just from the PDF, you need to find the DOI reference or something like that. And the data is importart, for chronology and to know how "fresh" the topic is.

In this particular case, "PVLDB Reference Format: ... PVLDB, 18(12): 5531 - 5536, 2025.", so published in 2025.