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If your database is not using C or POSIX for its collation setting (which you can check with SELECT datcollate FROM pg_database WHERE datname = current_database();), your indexes might be inconsistent if you ever ran with a version of glibc prior to 2.28 and did not immediately reindex your databases after updating to glibc 2.28 or newer.https://docs.joinmastodon.org/admin/troubleshooting/index-corruption/

libcのバージョンでDBのインデックス不整合が起きるのか…