POSI 2.0 Identity Migration Complete

At launch, POSI's journal identity system was mid-migration: records used an older, ad-hoc id scheme inherited from earlier tooling. As of today, that migration is complete — all 24,205 journal records POSI tracks, from the manually-curated Core Collection and Global Benchmark down to the large pool of automatically discovered-but-unreviewed records, now carry a permanent POSI-J-###### identity.

Identity was resolved from public evidence, not asserted: primarily ISSN-L via live OpenAlex lookups, falling back through canonical ISSN pairs and OpenAlex Source IDs only where ISSN-L wasn't available. Of the records processed today, 1,031 belonged to the Core Collection and Global Benchmark specifically — 874 received a newly minted id, and 157 turned out to already carry one from the earlier discovered-corpus pass, so the existing id was reused rather than duplicated. Every possible duplicate flagged along the way (171 groups) was resolved with real evidence, not string-matching heuristics: 166 confirmed as the same journal and merged, 5 confirmed distinct and kept separate.

This is an identity/data-layer change, not a ranking or scoring change — no PQF, AJR, or citation figure is affected, and every journal's URL and short code on this site is unchanged. What it buys going forward: every journal record now has one stable, permanent id that survives title changes, publisher changes, and future re-classification, which is a prerequisite for the frozen, reproducible PJR release process described in the Methodology pages.

Full audit trail — reproducibility verification, per-group duplicate resolution evidence, and the exact commit each batch was minted from — is linked from the Open Data page.