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fix(timeline): resume agents from the latest history

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Use a bounded tail probe on resume so long background runs appear atomically instead of replaying every missed page. Preserve unchanged views, reconcile local/live rows, and keep skipped history reachable through backward pagination.
This commit is contained in:
Mohamed Boudra
2026-07-31 11:36:31 +02:00
parent 142d4d2535
commit 3f63df678a
16 changed files with 654 additions and 165 deletions
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packages/app/src/contexts/session-context.tsx
+22 -19
View File
@@ -351,6 +351,9 @@ function SessionProviderInternal({ children, serverId, client }: SessionProvider
const setAgentTimelineCursor = useSessionStore((state) => state.setAgentTimelineCursor);
const setInitializingAgents = useSessionStore((state) => state.setInitializingAgents);
const bumpHistorySyncGeneration = useSessionStore((state) => state.bumpHistorySyncGeneration);
const markAgentHistorySynchronized = useSessionStore(
(state) => state.markAgentHistorySynchronized,
);
const applyAgentTimelineResponseState = useSessionStore(
(state) => state.applyAgentTimelineResponseState,
);
@@ -619,14 +622,18 @@ function SessionProviderInternal({ children, serverId, client }: SessionProvider
return;
}
applyAgentTimelineResponseState(serverId, agentId, {
items: result.tail,
head: result.head,
range: result.cursorChanged ? (result.cursor ?? null) : (currentCursor ?? null),
older: payload.hasOlder ? "available" : "none",
synchronized: shouldMarkAuthoritativeHistoryApplied,
acknowledgedClientMessageIds: result.acknowledgedClientMessageIds,
});
if (result.commit === "discard") {
markAgentHistorySynchronized(serverId, agentId);
} else {
applyAgentTimelineResponseState(serverId, agentId, {
items: result.tail,
head: result.head,
range: result.cursorChanged ? (result.cursor ?? null) : (currentCursor ?? null),
older: result.older,
synchronized: shouldMarkAuthoritativeHistoryApplied,
acknowledgedClientMessageIds: result.acknowledgedClientMessageIds,
});
}
executeTimelineSideEffects({
sideEffects: result.sideEffects,
@@ -643,7 +650,13 @@ function SessionProviderInternal({ children, serverId, client }: SessionProvider
setInitializingAgents,
});
},
[applyAgentTimelineResponseState, recoverTimelineGap, serverId, setInitializingAgents],
[
applyAgentTimelineResponseState,
markAgentHistorySynchronized,
recoverTimelineGap,
serverId,
setInitializingAgents,
],
);
useEffect(() => {
@@ -654,16 +667,6 @@ function SessionProviderInternal({ children, serverId, client }: SessionProvider
const sync = createViewedTimelineSync({
initialDeliveryMode,
setSubscription: (agentIds) => client.setAgentTimelineSubscription(agentIds),
readCursor: (agentId) => {
const timeline = selectAgentTimelineState(
useSessionStore.getState().sessions[serverId],
agentId,
);
return timeline.status === "synced" ? (timeline.range ?? undefined) : undefined;
},
hasAuthoritativeHistory: (agentId) =>
selectAgentTimelineState(useSessionStore.getState().sessions[serverId], agentId).status ===
"synced",
fetchPage: async (agentId, request) => {
const session = useSessionStore.getState().sessions[serverId];
const initKey = getInitKey(serverId, agentId);