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`rust/src/sliding_sync/connection.rs` holds `HaveSentRoom`, `RoomStatusMap` and its mutable twin with the live-only transitions, `PerConnectionState` and `MutablePerConnectionState`, and `RoomLazyMembershipChanges` with the hourly last-seen rewrite. Python's `ChainMap` becomes the previous maps behind an `Arc` plus the request's updates, so persisting can write only the updates, as it does today. The functions take the time as an argument. Phase 4 passes `runtime.clock()`, which follows trial's virtual time. The receipts stream's token type stays a parameter until then. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01L51DoxB8VnH8UjXJFDgpNG