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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.0.5 2 Oct 2025

Session Persistence Deduplication

What: Session entries are now deduplicated before persistence, preventing redundant API calls when the same conversation entry is encountered multiple times.

Details:

Uses UUID tracking to identify already-persisted entries
Reduces unnecessary backend calls and potential conflicts
Improves overall session handling performance
Evidence: K8B() at line 397234 in v2.0.5, modified from QPB() at line 23491 in v2.0.3

See this entry in the whole of v2.0.5 →