Linking the English Wikipedia article for this opera. Matched on composer and title: the article "Kuningas Lear" sits in Category:Operas by Aulis Sallinen, and its title matches this record's title or englishTitle. The record had no wikipediaUrl.

Sallinen Kuningas Lear (2000) is in Finnish, not Unknown. English Wikipedia gives Language: Finnish in the infobox; libretto by the composer after Shakespeare, premiered Finnish National Opera, Helsinki, 15 September 2000 — https://en.wikipedia.org/wiki/Kuningas_Lear . The title itself is Finnish. It pointed at the Unknown placeholder (14) only because Finnish was missing from the language table until edit 158004 added it.

Migration: a zero year, month, day or OperaClass id meant the value was unknown, not that it was zero. Set to null.

Sallinen King Lear is in Finnish, but Finnish is not available as a language option. Setting to Unknown until Finnish is added.