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The v2 backup silently dropped the entire rulebook system (rulebooks, topics, rules), the project subscription/suppression join tables, and events — so a 'full' backup wasn't. v3 adds all of them with FK re-mapping on restore, and a _not_included field that names the still-deferred tables (ACL groups/shares, api_keys, embeddings, transient/operational) so the gap is explicit, not silent. restore_full_backup routes v2 and v3 through one path; v3-only sections are guarded by data.get so a v2 payload still restores cleanly. Tests: version/coverage constants, pure join-table row helpers, and the export contract via a mocked session (CI has no DB; full round-trip is a manual check). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>