Remove PLAN.md as it is no longer needed

2026-02-09 22:06:09 -05:00
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-# Plan: Address PR #856 Review Feedback
-
-## Summary of Review Feedback
-
-Multiple reviewers identified the same core issues:
-
-1. **Race Condition in Idle Detection** (Medium-High Priority)
-   - When timeout fires at 3:00 but last message was at 2:59, `idleDuration` is 1 second, check fails
-   - Need to either remove redundant check or reset `lastActivityTime` on timeout
-
-2. **Missing Test Coverage** (High Priority)
-   - No tests for SessionQueueProcessor timeout logic
-   - Critical fix for high-impact bug (79 processes, 13.4GB swap)
-
-3. **Minor: Optional Chaining** (Low Priority)
-   - Use `onIdleTimeout?.()` instead of `if (onIdleTimeout) { onIdleTimeout() }`
-
-4. **Minor: Logging Enhancement** (Low Priority)
-   - Add timeout threshold to log message for debugging
-
---
-
-## Phase 0: Documentation Discovery (COMPLETE)
-
-### Sources Consulted
- PR #856 comments from claude, greptile-apps reviewers
- `src/services/queue/SessionQueueProcessor.ts` (current implementation)
-
-### Allowed APIs
- `waitForMessage(signal, timeoutMs)` → Promise<boolean>
- `logger.info('SESSION', ...)` for logging
-
-### The Fix Strategy
-
-The reviewers suggest two options:
-
-**Option A**: Remove redundant check since `waitForMessage` enforces timeout
-```typescript
-if (!receivedMessage && !signal.aborted) {
-  // Timeout occurred - exit gracefully
-  const idleDuration = Date.now() - lastActivityTime;
-  logger.info('SESSION', 'Exiting queue iterator due to idle timeout', { ... });
-  onIdleTimeout?.();
-  return;
-}
-```
-
-**Option B**: Reset `lastActivityTime` on timeout to handle edge cases
-```typescript
-if (!receivedMessage && !signal.aborted) {
-  const idleDuration = Date.now() - lastActivityTime;
-  if (idleDuration >= IDLE_TIMEOUT_MS) {
-    logger.info('SESSION', 'Exiting...', { ... });
-    onIdleTimeout?.();
-    return;
-  }
-  // CRITICAL: Reset timer since we know queue is empty now
-  lastActivityTime = Date.now();
-}
-```
-
-**Decision**: Use Option B - it's defensive and handles spurious wakeups correctly.
-
---
-
-## Phase 1: Fix Race Condition in SessionQueueProcessor
-
-### What to Implement
-Fix the idle timeout logic to reset `lastActivityTime` when timeout occurs but duration check fails.
-
-### Tasks
-1. In `createIterator()` at lines 50-62, add `lastActivityTime = Date.now()` after the duration check fails
-2. Use optional chaining for `onIdleTimeout?.()`
-3. Add timeout threshold to log message
-
-### Pattern to Follow
-```typescript
-if (!receivedMessage && !signal.aborted) {
-  const idleDuration = Date.now() - lastActivityTime;
-  if (idleDuration >= IDLE_TIMEOUT_MS) {
-    logger.info('SESSION', 'Idle timeout reached, triggering abort to kill subprocess', {
-      sessionDbId,
-      idleDurationMs: idleDuration,
-      thresholdMs: IDLE_TIMEOUT_MS
-    });
-    onIdleTimeout?.();
-    return;
-  }
-  // Reset timer on spurious wakeup - queue is empty but duration check failed
-  lastActivityTime = Date.now();
-}
-```
-
-### Verification
-```bash
-npm run build
-grep -A10 "idleDuration >= IDLE_TIMEOUT_MS" src/services/queue/SessionQueueProcessor.ts
-```
-
---
-
-## Phase 2: Add Unit Tests for SessionQueueProcessor
-
-### What to Implement
-Create test file covering the idle timeout behavior.
-
-### Test Cases Required
-1. Iterator exits after idle timeout when no messages arrive
-2. `onIdleTimeout` callback is invoked on timeout
-3. Message arrival resets the idle timer
-4. Abort signal takes precedence over timeout
-5. Event listener cleanup happens correctly
-
-### Location
-`tests/services/queue/SessionQueueProcessor.test.ts`
-
-### Verification
-```bash
-npm run test -- SessionQueueProcessor
-```
-
---
-
-## Phase 3: Build and Verify
-
-### Tasks
-1. Run `npm run build` - verify no TypeScript errors
-2. Run tests to ensure timeout behavior works
-3. Commit changes to fix/observer-idle-timeout branch
-4. Push to update PR #856
-
-### Verification
-```bash
-npm run build
-npm run test
-git diff --stat
-```
-
---
-
-## Phase 4: Update PR Description
-
-### Tasks
-1. Update test plan checkboxes in PR description
-2. Add note about race condition fix
-
---
-
-## Summary of Changes
-
-| File | Change |
-|------|--------|
-| `src/services/queue/SessionQueueProcessor.ts` | Fix race condition, optional chaining, enhanced logging |
-| `tests/services/queue/SessionQueueProcessor.test.ts` | New test file for timeout behavior |