Evo: Preserve DMN history across reorgs

[navidR]

Preserve persisted deterministic-masternode diffs and snapshots when disconnecting blocks, while evicting only the in-memory cache entry. Add a regression test proving orphan history remains reconstructible across reorgs.

Upstream: Dash PR #3435.

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🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	861d92d	Aug 30, 2026 · 14:55	14:58

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Reviewing files that changed from the base of the PR and between 4f0c771 and 861d92d.

📒 Files selected for processing (2)

• src/evo/deterministicmns.cpp
• src/test/evo_deterministicmns_tests.cpp

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-30T14:57:19.275300Z	861d92d	PR opened

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User description

Preserve persisted deterministic-masternode diffs and snapshots when disconnecting blocks, while evicting only the in-memory cache entry. Add a regression test proving orphan history remains reconstructible across reorgs.

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CodeAnt-AI Description

Preserve deterministic masternode history after chain reorganizations

What Changed

• Disconnecting a block now removes only its in-memory masternode cache entry, while retaining the persisted list history needed to reconstruct orphaned blocks
• Added coverage confirming that an invalidated block still returns its original masternode list, height, and members

Impact

✅ Reconstructible masternode history after reorgs
✅ Reliable orphan-block masternode lookups

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CodeAnt Nitpicks

1 code suggestion

1. The test checks only MN membership and metadata, so incorrect collateral, registration, confirmation, or PoSe state can be restored without failing.

Incomplete implementation · src/test/evo_deterministicmns_tests.cpp:620-623

[reubenyap]

Reviewed the current head and traced disconnects through the EvoDB transaction, cache eviction, list reconstruction, reconnect, and VerifyDB rollback paths. Keeping the persisted diff/snapshot while evicting the disconnected block from memory preserves orphan history without letting stale cached state drive the active tip. The regression and full CI matrix are green. I found no actionable issues.