Deduplicate cells in collated data during one validator session#1848

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SpyCheese wants to merge 19 commits intotestnetfrom

collated-data-opt

Commits on Sep 29, 2025

Deduplicate cells in collated data during one validator session
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Commits on Oct 10, 2025

Commits on Oct 12, 2025

Commits on Nov 4, 2025

Merge branch 'testnet' into collated-data-opt
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Commits on Nov 6, 2025

Fix processing applied blocks in CollatorNodeSession
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Commits on Nov 13, 2025

Merge branch 'testnet' into collated-data-opt
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Commits on Nov 14, 2025

Fix cleanup of old blocks in ValidatorSession
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Commits on Nov 17, 2025

Merge branch 'testnet' into collated-data-opt
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