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docs: decision note 0054, the PostgreSQL database pair - #65
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The design note for the second converge engine: a pure twin of the MariaDB implementation. pg_basebackup seeding, the timeline as the divergence probe, confirmed-reseed failback (pg_rewind is the revisit path), no-timeout synchronous commit per 0031, and the netns gate last. Found by the 2026-10-13 BR1+BR2 pair test; implements 0013's PostgreSQL column.
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Replaces the closed #64 (its branch predated decision notes 0048-0053 and conflicted on numbering; this branch renames the note to 0054 and sits on current main).
Decision note 0054: the PostgreSQL database pair — twin-module layout, pg_basebackup seeding, standby-inherent read-only, drain-then-pg_promote() promotion, hba_file GUC moving the authorization surface into keel's conf.d file.