feat(event cache): introduce an absolute local event ordering#5225

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bnjbvr merged 8 commits intomainfrom

bnjbvr/linked-chunk-ordering

Jun 30, 2025

Commits on Jun 30, 2025

refactor(linked chunk): generalize `UpdateToVectorDiff` to handle different accumulators
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doc(linked chunk): explain briefly what the reattaching/detaching flags are doing
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feat(linked chunk): introduce an `OrderTracker` to keep track of the ordering of the current items
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feat(event cache): introduce an `OrderTracker` for each room tracked by the event cache
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refactor(event cache): regroup lazy-loading methods in the same impl block
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feat(event cache store): add a method to return the chunks' metadata
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refactor(event cache): use the linked chunk metadata to construct the `OrderTracker`
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chore(event cache): address review comments
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