docs+test: upgrade/downgrade compatibility policy and format-compat regressions - #384
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…egressions Add docs/manual/upgrade-and-downgrade.md recording the compatibility matrix: new versions read legacy (variable-length, pre-marker) databases; downgrading below the marker-introducing release is NOT supported for databases that contain commit-time tombstone markers (negative length prefixes). Includes the recommended read-only-first upgrade order and notes the planned cross-version CI job. FormatCompatPolicyTests locks in the forward-compatibility guarantees: (1) a legacy variable-length file reads back and accepts current-version marker writes across reopens, (2) commit-time tombstone markers stay stable across reopen cycles while rows appended afterwards coexist.
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Samenvatting
Punt 2 hardening: upgrade/downgrade-beleid gedocumenteerd + format-compat regressietests.
Nieuwe
docs/manual/upgrade-and-downgrade.mdmet de compatibiliteitsmatrix:encrypted-header bestanden; zonder
IsFixedWidthRecords-flag blijft een tabel variable-length.(negatieve lengte-prefixes) — een oudere binary die alleen positieve prefixes kent kan die niet
overslaan. Inclusief aanbevolen upgrade-volgorde (backup → read-only open → read-write) en de
geplande cross-version CI-job.
FormatCompatPolicyTests(2 nieuwe tests) vergrendelt de twee forward-compat-garanties:writes, over meerdere reopens.
geappendete rijen.
Validatie