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docs(sync): update implementation review and E2E test plan
- Add December 11 security review results (all issues verified as addressed) - Document newly added tests (3-way conflict, delete vs update, large conflict sets) - Update test coverage status table with completed items - Mark supersync E2E test plan as IMPLEMENTED - List all test files and their coverage areas
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Johannes Millan
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**Date:** 2025-12-08
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**Branch:** `feat/operation-logs`
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**Last Updated:** December 8, 2025 (corrected false positives)
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**Last Updated:** December 11, 2025 (code review and test improvements)
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This document summarizes findings from a comprehensive review of the operation log implementation, covering bugs, redundancies, architecture issues, and test coverage gaps.
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---
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## December 11, 2025 Update: Security Review
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A comprehensive security review was conducted on December 11, 2025. Several "critical" security issues were initially flagged but upon verification were found to be **already addressed**:
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### Verified Security Measures ✅
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| Issue | Status | Location |
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| -------------------------- | ---------------------- | ------------------------------------------------------------- |
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| **Timing attack on login** | ✅ Already mitigated | `auth.ts:214-219` - Uses dummy hash comparison |
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| **Vector clock DoS** | ✅ Already implemented | `sync.types.ts:66-110` - Limits to 100 entries, 255 char keys |
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| **CSRF protection** | ✅ Not needed | JWT Bearer tokens in Authorization header, not cookies |
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### Verified Reliability Measures ✅
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| Issue | Status | Location |
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| ------------------------------ | --------------------------- | ------------------------------------------------------------------------ |
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| **Error handling in reducers** | ✅ Defensive checks present | `short-syntax-shared.reducer.ts:69-71` - Returns early if task not found |
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| **ClientId recovery** | ✅ Handled upstream | `metaModel.loadClientId()` creates clientId if missing |
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### Tests Added (December 11, 2025)
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| Test | File | Description |
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| ------------------------------ | ------------------------------------- | ----------------------------------------- |
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| 3-way conflict E2E | `supersync-edge-cases.spec.ts` | 3 clients editing same task concurrently |
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| Delete vs Update E2E | `supersync-edge-cases.spec.ts` | One client deletes while another updates |
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| Large conflict sets (100+ ops) | `conflict-resolution.service.spec.ts` | Stress test with 50 local + 50 remote ops |
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| Multi-entity conflicts | `conflict-resolution.service.spec.ts` | 10 entities with 10 ops each |
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---
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## Executive Summary
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The operation log implementation has a solid architectural foundation with event sourcing, vector clocks, and meta-reducers for atomic operations. However, several issues and test gaps were discovered that should be addressed before production use.
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### Critical Missing Tests
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| Gap | Scenario | Impact |
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| -------------------------- | ------------------------------ | ---------------- |
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| **Race conditions** | Concurrent append + compaction | Data loss |
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| **Error recovery** | Quota exceeded mid-write | State corruption |
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| **Multi-tab coordination** | Tab A append + Tab B compact | Lock deadlock |
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| Gap | Scenario | Impact | Status |
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| -------------------------- | ------------------------------ | ---------------- | ---------------------------------------------------- |
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| **Race conditions** | Concurrent append + compaction | Data loss | Open |
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| **Error recovery** | Quota exceeded mid-write | State corruption | ✅ Tested (8 tests in operation-log.effects.spec.ts) |
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| **Multi-tab coordination** | Tab A append + Tab B compact | Lock deadlock | Open |
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### Missing Scenarios
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1. **Concurrent operations:** No test for append during compaction
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2. **Quota exceeded:** Emergency compaction path never tested
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2. ~~**Quota exceeded:** Emergency compaction path never tested~~ → ✅ Extensively tested (8 test cases)
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3. **Schema migration:** Version mismatch during hydration
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4. **3-way conflicts:** Only 2-way conflict resolution tested
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5. **Conflict on deleted entity:** Update for entity local deleted
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6. **Very large conflict sets:** 100+ ops on same entity
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4. ~~**3-way conflicts:** Only 2-way conflict resolution tested~~ → ✅ Added E2E test (supersync-edge-cases.spec.ts)
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5. ~~**Conflict on deleted entity:** Update for entity local deleted~~ → ✅ Added E2E test (supersync-edge-cases.spec.ts)
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6. ~~**Very large conflict sets:** 100+ ops on same entity~~ → ✅ Added unit tests (conflict-resolution.service.spec.ts)
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7. **Download retry:** Network failure mid-pagination (2 tests skipped with `pending()`)
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### Test Infrastructure Issues
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- `sync-scenarios.integration.spec.ts:18-32`: All SimulatedClients share same IndexedDB (not true isolation)
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- ~~`sync-scenarios.integration.spec.ts:18-32`: All SimulatedClients share same IndexedDB (not true isolation)~~ → ✅ Documented as intentional design choice with clear explanation of logical isolation strategy (see `simulated-client.helper.ts`)
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- `operation-log-download.service.spec.ts:360-373`: 2 tests marked `pending()` due to timeout
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- Benchmark tests disabled (`xdescribe`)
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# SuperSync E2E Test Plan
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## Status: PLANNED (Not Yet Implemented)
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## Status: ✅ IMPLEMENTED
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This plan describes full end-to-end tests for operation-log sync between two browser clients using the real super-sync-server. These tests complement the existing Karma-based integration tests by testing the complete sync flow including network, authentication, and UI.
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**Last Updated:** December 11, 2025
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**Prerequisite:** Basic sync functionality should be working before implementing these tests.
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This document describes the full end-to-end tests for operation-log sync between multiple browser clients using the real super-sync-server. These tests complement the existing Karma-based integration tests by testing the complete sync flow including network, authentication, and UI.
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### Implementation Status
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| Component | Status |
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| -------------------------- | ----------------------------- |
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| Test mode server endpoints | ✅ Implemented |
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| Docker Compose setup | ✅ Implemented |
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| SuperSyncPage page object | ✅ Implemented |
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| Helper utilities | ✅ Implemented |
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| Basic sync tests | ✅ Implemented |
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| Conflict resolution tests | ✅ Implemented |
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| Edge case tests | ✅ Implemented (Dec 11, 2025) |
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### Test Files
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| File | Description |
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| --------------------------------------------- | -------------------------------------------------------------- |
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| `e2e/tests/sync/supersync.spec.ts` | Core sync scenarios (create, bidirectional, basic conflict) |
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| `e2e/tests/sync/supersync-advanced.spec.ts` | Advanced scenarios (delete conflicts, time tracking) |
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| `e2e/tests/sync/supersync-edge-cases.spec.ts` | Edge cases (3-way conflicts, delete vs update, offline bursts) |
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| `e2e/tests/sync/supersync-models.spec.ts` | Model-specific sync (projects, tags) |
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### Running Tests
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```bash
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# Start server and run all supersync tests
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npm run e2e:supersync
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# Run specific test file
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npm run e2e:playwright:file e2e/tests/sync/supersync-edge-cases.spec.ts
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```
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---
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