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The watermark cache is the registry's authoritative mutable state; a checkpoint consumer holding the live reference could corrupt every subsequent snapshot and frame through it. structuredClone at the read face (total, by the unit plain-JSON contract) pins the boundary; a mutation test proves the cache is unreachable through handed-out rows. restore and viewCheckpoint only touch caller-owned rows — no other leak path.
session-projection/
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Session-projection capability family: the seam through which domain host plugins serve whole current values of log-derived per-session state to client carriers.
| Package | ctx key | Role |
|---|---|---|
session-projection |
sessionProjections |
The interface package: the merge-extensible SessionProjectionMap type table, the ProjectionDefinition unit contract, and the eagerly driven registry carriers read synchronously |
session-projection-cache |
sessionProjectionCache |
Persisted projection cache: durable per-session unit checkpoints over the domain data form, throttled write-behind with mandatory turn/end + detach points, and the cold-read ladder (cache row + persistence tail replay) |