---
phase: 01-core-infrastructure
plan: 01
subsystem: state
tags: [python, dataclasses, json, atomic-write, backup, persistence]

# Dependency graph
requires: []
provides:
  - SessionState dataclass for session metadata
  - Atomic save_state() function with backup rotation
  - load_state() function with validation and fallback
  - StateManager class for workspace-based state management
affects: [02-tmux-session, 03-command-bridge, 04-gsd-integration]

# Tech tracking
tech-stack:
  added: [python dataclasses, json, tempfile, os.replace]
  patterns: [atomic write pattern, backup rotation, validation with fallback]

key-files:
  created:
    - src/gsd_openclaw/state_manager.py
    - tests/test_state_manager.py
  modified:
    - src/gsd_openclaw/__init__.py
    - tests/conftest.py
    - pyproject.toml

key-decisions:
  - "Use tempfile.mkstemp + os.replace for atomic writes (POSIX guarantee)"
  - "Keep single backup (.bak) rather than backup history"
  - "Validate schema version and required fields on load"
  - "Fall back to backup on JSON or validation errors"

patterns-established:
  - "Atomic write pattern: temp file in target dir, os.replace for atomic rename"
  - "Backup rotation: rename existing state.json to state.json.bak before write"
  - "Validation pattern: check schema version first, then required fields"
  - "Fallback pattern: try main file, then backup, raise last error if both fail"

requirements-completed: [SESS-04]

# Metrics
duration: 7min
completed: 2026-03-10
---

# Phase 1 Plan 1: State Persistence Layer Summary

**SessionState dataclass with atomic saves, backup rotation, and automatic fallback for crash-safe persistence**

## Performance

- **Duration:** 7 min
- **Started:** 2026-03-10T16:32:46Z
- **Completed:** 2026-03-10T16:39:55Z
- **Tasks:** 4
- **Files modified:** 5

## Accomplishments

- SessionState dataclass with all required fields for session metadata
- Atomic save_state() using tempfile + os.replace pattern
- load_state() with schema validation and automatic backup fallback
- StateManager class providing clean interface with workspace path resolution

## Task Commits

Each task was committed atomically:

1. **Task 1: Create state schema with dataclasses** - `9ef5733` (feat)
2. **Task 2: Implement atomic state save with backup rotation** - `8e0c973` (feat)
3. **Task 3: Implement state load with validation and fallback** - `b221c5a` (feat)
4. **Task 4: Create StateManager class with workspace path resolution** - `b2175b3` (feat)

## Files Created/Modified

- `src/gsd_openclaw/state_manager.py` - SessionState dataclass, save_state, load_state, StateManager
- `src/gsd_openclaw/__init__.py` - Package exports
- `tests/test_state_manager.py` - 25 comprehensive tests
- `tests/conftest.py` - Added tmp_state_dir and sample_state fixtures
- `pyproject.toml` - Python package configuration

## Decisions Made

- **Atomic write pattern**: Use tempfile.mkstemp in target directory, then os.replace for POSIX-atomic rename
- **Backup strategy**: Single backup file (state.json.bak), rotated on each save
- **Validation**: Schema version must be "1.0", required fields: session_id, project_name, tmux_session_name
- **Fallback behavior**: On JSON or validation errors, automatically try backup file

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None - all tasks completed smoothly following TDD approach.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- State persistence layer complete and tested
- Ready for Phase 1 Plan 02 (tmux session management)
- StateManager can be imported by other components for state access

---
*Phase: 01-core-infrastructure*
*Completed: 2026-03-10*

## Self-Check: PASSED

- All source files exist and verified
- All 4 task commits verified in git log
- All 25 tests passing