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Owner decision (#668): when two documents share a meta_date, order them by title ascending instead of createdAt ascending. title is @Column(nullable=false) so it is always present, giving a deterministic, human-meaningful total order. Only the DATE-sort fast path changes; the in-memory SENDER/RECEIVER/RELEVANCE comparators are untouched. ORDER BY meta_date <dir> NULLS LAST, title ASC Tests assert title-asc tiebreaking for same-date rows in BOTH directions, with a fixture whose title order is the OPPOSITE of insertion (createdAt) order so the test fails if the tiebreaker reverts to createdAt. The integration test drives the production resolveSort against real Postgres. Refs #668