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feat(core): deterministic session log replay with synced watermark (#35040)

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Kit Langton 2026-07-02 21:38:20 -04:00 • committed by GitHub
commit 57e9e9771d
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16 changed files with 205 additions and 87 deletions
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4
packages/protocol/src/groups/session.ts
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@ -485,7 +485,7 @@ export const makeSessionGroup = <I extends HttpApiMiddleware.AnyId, S>(sessionLo
follow: BooleanFromString.pipe(Schema.optional),
},
success: HttpApiSchema.StreamSse({
data: Schema.Union([SessionEvent.Durable, EventLog.CaughtUp]).annotate({ identifier: "SessionLogItem" }),
data: Schema.Union([SessionEvent.Durable, EventLog.Synced]).annotate({ identifier: "SessionLogItem" }),
}),
error: SessionNotFoundError,
})
@ -495,7 +495,7 @@ export const makeSessionGroup = <I extends HttpApiMiddleware.AnyId, S>(sessionLo
identifier: "v2.session.log",
summary: "Read the session log",
description:
"Durable, ordered, gap-free read of public session events after an exclusive aggregate sequence. Emits a caught-up marker once the replay reaches the end of the log, then completes; with follow=true it continues with live events instead. The only event API that promises reliability: attach after a snapshot watermark to compose fetch and stream without a race window.",
"Durable, ordered, gap-free read of public session events after an exclusive aggregate sequence. Emits a synced marker once replay reaches the captured watermark, then completes; with follow=true it continues with live events instead. The only event API that promises reliability: attach after a snapshot watermark to compose fetch and stream without a race window.",
}),
),
)