1.4.2

The 9.6 exported-snapshot-name repair. Full details in the CHANGELOG and ADR-0009.

Fixed

• A plugin-decoder snapshot on PostgreSQL 9.6 can adopt its exported snapshot. 9.6 exports a two-part snapshot name (00004E57-1) where 10 and later export three parts; the SET TRANSACTION SNAPSHOT allowlist admitted only the three-part form, so decoder: :wal2json/:pglogical with snapshot: true on 9.6 failed its back-fill :snapshot_failed and held :snapshot_incomplete, fail-closed, delivering nothing. The allowlist now admits both forms with the same character class. A new connected leg (plugin_snapshot_pg96_test.exs) back-fills on a real 9.6 while a writer commits across the handoff and asserts every row arrives exactly once across snapshot and stream — CI's 9.6 and 12 rows execute it (receipt run 37122961851).