---
phase: 05-cloudkit-crud
plan: 01
subsystem: data-pipeline
tags: [cloudkit, python, sync, diff, change-detection]

# Dependency graph
requires:
  - phase: 04-canonical-linking
    provides: 5760 canonicalized games with resolved team/stadium links
provides:
  - query_all() method with pagination for CloudKit queries
  - compute_diff() for comparing local vs cloud records
  - --diff flag for diff reporting without sync
  - --smart-sync flag for differential uploads
  - --delete-orphans flag for removing orphan records
affects: [05-02-verification, 06-validation-reports]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Differential sync with recordChangeTag conflict detection"
    - "Pagination via continuationMarker for large record sets"

key-files:
  created: []
  modified:
    - Scripts/cloudkit_import.py

key-decisions:
  - "New records use forceReplace, updated records use update with recordChangeTag"
  - "Conflict handling (409) retries with forceReplace after re-query"
  - "Location comparison uses 0.0001 tolerance for lat/lng"
  - "Orphan deletion requires explicit --delete-orphans flag for safety"

patterns-established:
  - "Differential sync pattern: query → diff → selective upload"
  - "Field comparison: direct for strings, tolerance for coords, recordName for refs"

issues-created: []

# Metrics
duration: 6min
completed: 2026-01-10
---

# Phase 5 Plan 1: Smart Sync Summary

**CloudKit differential sync with query_all() pagination, compute_diff() change detection, and --smart-sync flag for selective uploads**

## Performance

- **Duration:** 6 min
- **Started:** 2026-01-10T16:02:53Z
- **Completed:** 2026-01-10T16:08:31Z
- **Tasks:** 2
- **Files modified:** 1

## Accomplishments

- Added `query_all()` method with pagination using continuationMarker for >200 records
- Added `compute_diff()` function returning new/updated/unchanged/deleted categorization
- Added `--diff` flag showing change report without importing
- Added `--smart-sync` flag for differential uploads (skips unchanged records)
- Added `--delete-orphans` flag for removing CloudKit records not in local data
- Added update operation handling with recordChangeTag conflict detection
- Added menu options 12 (Smart sync) and 13 (Smart sync + delete orphans)

## Task Commits

Each task was committed atomically:

1. **Task 1: Add change detection with diff reporting** - `0c74495` (feat)
2. **Task 2: Add differential sync with smart-sync flag** - `d9a6aa4` (feat)

## Files Created/Modified

- `Scripts/cloudkit_import.py` - Added query_all(), compute_diff(), sync_diff(), new flags

## Decisions Made

- New records use forceReplace (creates or replaces)
- Updated records use update operationType with recordChangeTag
- Conflict handling (409) retries with forceReplace after re-query
- Location comparison uses 0.0001 degree tolerance for lat/lng
- Orphan deletion requires explicit flag (safe by default)
- Field comparison ignores recordChangeTag and timestamps

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## Next Phase Readiness

- Smart sync infrastructure complete
- Ready for 05-02: Verification and record management
- --diff can verify CloudKit state before/after sync operations

---
*Phase: 05-cloudkit-crud*
*Completed: 2026-01-10*