It is called the Federal Parent Locator Service, and it’s meant for finding people who owe child support.
The Federal Parent Locator Service gets information via The National Directory of New Hires and the Federal Case Registry. Apparently federal law requires all companies to report new hires within 20 days.
The database contains the name, address, Social Security number, employer, and salary or wages of every employed person in the country, as well as the equivalent details for anyone listed in state unemployment systems. It exists so that if someone owes child support, the government can pursue them for it even if they’ve changed jobs or moved to another state.
There is absolutely no hope that any information collected by a government entity or private business remains siloed. Clearly, all these databases are going to be compared against each other (or already are).
Also, apparently DOGE got access to this database last year:
Last year, Department of Government Efficiency appointees sought and for a brief period gained access to the National Directory of New Hires, the part of the child support database that contains people’s employment information. It is unclear what, if anything, the DOGE team did with this data; the federal courts temporarily blocked it from continuing to access Social Security, IRS and other sensitive records, and then DOGE disbanded last summer before final rulings on the legality of its efforts had been made.