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Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Mar 27, 2026 2:21am

PR Summary

Medium Risk
Refactors terminal console storage/persistence and execution reconnection flow; regressions could impact log rendering, reconnect reliability, or client-side execution state across refreshes.

Overview
Improves terminal performance and durability of execution logs. Terminal log rendering is refactored to a virtualized list (react-window) backed by a new flattenVisibleExecutionRows model, and selection now tracks by entryId with targeted selectors (useWorkflowConsoleEntries, useConsoleEntry) to reduce re-renders.

Reworks terminal console storage and persistence. The console store moves from a single entries array to per-workflow workflowEntries with indexes for fast updates, adds normalization/truncation plus safe stringification for large/circular payloads, and replaces Zustand persist with an execution-aware IndexedDB persistence manager (consolePersistence) including an ExecutionPointer used to resume reconnects.

Makes SSE execution/reconnect streams resumable by event id. Server execution and reconnect APIs now attach eventId to buffered SSE events and extend reconnect polling to ~55 minutes; client stream processing surfaces onEventId and uses persisted pointers to reconnect from the last seen event.

Also: fetchChatHistory now falls back to the Copilot chat endpoint when the Mothership fetch fails, Copilot orchestrator can abort client-tool waits on disconnect, and workflow diffs treat parentId moves (and locked) as editable changes.

^{Written by Cursor Bugbot for commit 27a0e22. Configure here.}

Greptile Summary

This PR delivers a well-structured set of performance improvements to the terminal console log rendering system, replacing recursive full-tree rendering with a virtualized list, moving to per-workflow granular store subscriptions, and introducing an execution-aware persistence manager that avoids unnecessary IndexedDB serialization during hot execution paths.

Key changes:

• Virtualized log list: ExecutionGroupRow recursive rendering is replaced by TerminalLogsPane backed by a virtual List component. A new flattenVisibleExecutionRows utility converts the hierarchical execution-group tree into a flat VisibleTerminalRow[] array that respects expandedNodes.
• Granular store subscriptions: useWorkflowConsoleEntries (using useShallow) subscribes only to a specific workflow's entries. useConsoleEntry resolves a single entry by ID via the new entryLocationById O(1) index.
• Execution-aware persistence (ConsolePersistenceManager): Persistence is now triggered only at execution lifecycle boundaries, eliminating Zustand persist middleware overhead on every store update.
• renderChildren prop: Added to node row components so each virtual list row renders only itself; children are provided as separate flattened rows.
• outputDataStringified moved into OutputPanel: Computation is deferred and skipped when in structured or code-display view.
• Diff engine fix: parentId changes are now detected, flagging blocks that move into or out of a subflow/loop.

Confidence Score: 4/5

Safe to merge after verifying the fixed 32 px row height does not clip real-world entry content.

The architecture is sound — virtualization, granular subscriptions, and lifecycle-aware persistence are all well-reasoned improvements backed by tests. The one concrete concern (fixed 32 px row height for variable-height content) could cause visual clipping in production but is not a data-loss or correctness bug. The documentation mismatch in the safety timer comment is trivial. No logic regressions, no security issues.

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/terminal/terminal.tsx — verify LOG_ROW_HEIGHT_PX = 32 is sufficient for all rendered entry types.

Important Files Changed

_{Reviews (2): Last reviewed commit: "fix diff comment" | Re-trigger Greptile}

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