Sprint 10: Review & Polish - MVP Complete + Test Fixes

CHECKPOINT_API_SUMMARY.md

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+# Sprint 10 Phase 4: Checkpoint API Endpoints
+
+**Implementation Date**: 2025-11-23
+**Tasks Completed**: T092, T093, T094, T095, T096, T097
+
+## Summary
+
+Added 5 FastAPI endpoints for project checkpoint management:
+
+1. **GET /api/projects/{id}/checkpoints** - List all checkpoints for project (T092)
+2. **POST /api/projects/{id}/checkpoints** - Create new checkpoint (T093)
+3. **GET /api/projects/{id}/checkpoints/{cid}** - Get specific checkpoint (T094)
+4. **DELETE /api/projects/{id}/checkpoints/{cid}** - Delete checkpoint and files (T095)
+5. **POST /api/projects/{id}/checkpoints/{cid}/restore** - Restore checkpoint (T096, T097)
+
+## Files Modified
+
+### 1. `codeframe/ui/models.py`
+Added 3 Pydantic models:
+- `CheckpointCreateRequest` - Request for creating checkpoints
+- `CheckpointResponse` - Response model for checkpoint data
+- `RestoreCheckpointRequest` - Request for restoring checkpoints (with diff preview)
+
+### 2. `codeframe/ui/server.py`
+Added 5 endpoint handlers (lines 2593-3032):
+- `list_checkpoints()` - GET endpoint
+- `create_checkpoint()` - POST endpoint
+- `get_checkpoint()` - GET endpoint
+- `delete_checkpoint()` - DELETE endpoint
+- `restore_checkpoint()` - POST endpoint
+
+## API Design
+
+### Request/Response Models
+
+```python
+# Create checkpoint request
+{
+    "name": str,              # Required, max 100 chars
+    "description": str,       # Optional, max 500 chars
+    "trigger": str            # Default: "manual"
+}
+
+# Checkpoint response
+{
+    "id": int,
+    "project_id": int,
+    "name": str,
+    "description": str | null,
+    "trigger": str,
+    "git_commit": str,
+    "database_backup_path": str,
+    "context_snapshot_path": str,
+    "metadata": {
+        "project_id": int,
+        "phase": str,
+        "tasks_completed": int,
+        "tasks_total": int,
+        "agents_active": list[str],
+        "last_task_completed": str | null,
+        "context_items_count": int,
+        "total_cost_usd": float
+    },
+    "created_at": str  # ISO 8601
+}
+
+# Restore checkpoint request
+{
+    "confirm_restore": bool  # False = show diff, True = restore
+}
+```
+
+## HTTP Status Codes
+
+| Endpoint | Success | Error Codes |
+|----------|---------|-------------|
+| GET /checkpoints | 200 | 404 (project not found) |
+| POST /checkpoints | 201 | 404 (project not found), 500 (creation failed) |
+| GET /checkpoints/{id} | 200 | 404 (project/checkpoint not found) |
+| DELETE /checkpoints/{id} | 204 | 404 (project/checkpoint not found), 500 (deletion failed) |
+| POST /checkpoints/{id}/restore | 200 (diff), 202 (restore) | 404 (not found), 500 (restore failed) |
+
+## Integration Points
+
+### CheckpointManager
+All endpoints use `CheckpointManager` from `codeframe/lib/checkpoint_manager.py`:
+
+```python
+class CheckpointManager:
+    async def create_checkpoint(name: str, description: Optional[str] = None) -> Checkpoint
+    async def list_checkpoints() -> List[Checkpoint]
+    async def restore_checkpoint(checkpoint_id: int, confirm: bool = False) -> Dict[str, Any]
+```
+
+### Database Methods
+Database operations via `Database` class:
+
+```python
+def get_checkpoints(project_id: int) -> List[Checkpoint]
+def get_checkpoint_by_id(checkpoint_id: int) -> Optional[Checkpoint]
+def save_checkpoint(...) -> int
+# DELETE via raw SQL in endpoint
+```
+
+## Testing with cURL
+
+### 1. List Checkpoints (T092)
+
+```bash
+curl -X GET "http://localhost:8080/api/projects/1/checkpoints" \
+  -H "Content-Type: application/json"
+```
+
+**Expected Response (200 OK)**:
+```json
+{
+  "checkpoints": [
+    {
+      "id": 1,
+      "project_id": 1,
+      "name": "Before refactor",
+      "description": "Safety checkpoint",
+      "trigger": "manual",
+      "git_commit": "a1b2c3d4e5f6...",
+      "database_backup_path": "/path/to/checkpoint-001-db.sqlite",
+      "context_snapshot_path": "/path/to/checkpoint-001-context.json",
+      "metadata": {
+        "project_id": 1,
+        "phase": "active",
+        "tasks_completed": 15,
+        "tasks_total": 40,
+        "agents_active": ["backend-001", "frontend-001"],
+        "last_task_completed": "Implement JWT authentication",
+        "context_items_count": 50,
+        "total_cost_usd": 2.45
+      },
+      "created_at": "2025-11-23T10:30:00Z"
+    }
+  ]
+}
+```
+
+### 2. Create Checkpoint (T093)
+
+```bash
+curl -X POST "http://localhost:8080/api/projects/1/checkpoints" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "Before refactor",
+    "description": "Safety checkpoint before major refactoring",
+    "trigger": "manual"
+  }'
+```
+
+**Expected Response (201 Created)**:
+```json
+{
+  "id": 2,
+  "project_id": 1,
+  "name": "Before refactor",
+  "description": "Safety checkpoint before major refactoring",
+  "trigger": "manual",
+  "git_commit": "a1b2c3d4e5f6789...",
+  "database_backup_path": "/path/to/checkpoint-002-db.sqlite",
+  "context_snapshot_path": "/path/to/checkpoint-002-context.json",
+  "metadata": {
+    "project_id": 1,
+    "phase": "active",
+    "tasks_completed": 15,
+    "tasks_total": 40,
+    "agents_active": ["backend-001"],
+    "last_task_completed": "Add user authentication",
+    "context_items_count": 50,
+    "total_cost_usd": 2.45
+  },
+  "created_at": "2025-11-23T10:35:00Z"
+}
+```
+
+### 3. Get Specific Checkpoint (T094)
+
+```bash
+curl -X GET "http://localhost:8080/api/projects/1/checkpoints/2" \
+  -H "Content-Type: application/json"
+```
+
+**Expected Response (200 OK)**: Same as create response
+
+### 4. Delete Checkpoint (T095)
+
+```bash
+curl -X DELETE "http://localhost:8080/api/projects/1/checkpoints/2" \
+  -H "Content-Type: application/json"
+```
+
+**Expected Response (204 No Content)**: Empty body
+
+### 5. Restore Checkpoint - Show Diff (T096)
+
+```bash
+curl -X POST "http://localhost:8080/api/projects/1/checkpoints/1/restore" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "confirm_restore": false
+  }'
+```
+
+**Expected Response (200 OK)**:
+```json
+{
+  "checkpoint_name": "Before refactor",
+  "diff": "diff --git a/codeframe/agents/worker.py b/codeframe/agents/worker.py\nindex abc123..def456 100644\n--- a/codeframe/agents/worker.py\n+++ b/codeframe/agents/worker.py\n@@ -10,7 +10,7 @@ class WorkerAgent:\n     def __init__(self):\n-        self.status = 'idle'\n+        self.status = 'active'\n"
+}
+```
+
+### 6. Restore Checkpoint - Confirm Restore (T097)
+
+```bash
+curl -X POST "http://localhost:8080/api/projects/1/checkpoints/1/restore" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "confirm_restore": true
+  }'
+```
+
+**Expected Response (202 Accepted)**:
+```json
+{
+  "success": true,
+  "checkpoint_name": "Before refactor",
+  "git_commit": "a1b2c3d4e5f6789...",
+  "items_restored": 50
+}
+```
+
+## Error Handling Examples
+
+### 404 - Project Not Found
+```bash
+curl -X GET "http://localhost:8080/api/projects/9999/checkpoints"
+```
+
+**Response (404)**:
+```json
+{
+  "detail": "Project 9999 not found"
+}
+```
+
+### 404 - Checkpoint Not Found
+```bash
+curl -X GET "http://localhost:8080/api/projects/1/checkpoints/9999"
+```
+
+**Response (404)**:
+```json
+{
+  "detail": "Checkpoint 9999 not found"
+}
+```
+
+### 404 - Checkpoint Doesn't Belong to Project
+```bash
+# Checkpoint 1 belongs to project 2, but we're accessing via project 1
+curl -X GET "http://localhost:8080/api/projects/1/checkpoints/1"
+```
+
+**Response (404)**:
+```json
+{
+  "detail": "Checkpoint 1 does not belong to project 1"
+}
+```
+
+### 500 - Checkpoint Creation Failed
+```bash
+curl -X POST "http://localhost:8080/api/projects/1/checkpoints" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "Test checkpoint"
+  }'
+```
+
+**Response (500)** (if git fails):
+```json
+{
+  "detail": "Checkpoint creation failed: Git commit failed: ..."
+}
+```
+
+### 500 - Restore Failed (Missing Files)
+```bash
+curl -X POST "http://localhost:8080/api/projects/1/checkpoints/1/restore" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "confirm_restore": true
+  }'
+```
+
+**Response (500)** (if backup files deleted):
+```json
+{
+  "detail": "Checkpoint files missing: DB=/path/to/checkpoint-001-db.sqlite, Context=/path/to/checkpoint-001-context.json"
+}
+```
+
+## Logging
+
+All endpoints include comprehensive logging:
+
+```python
+# On checkpoint creation
+logger.info(f"Created checkpoint {checkpoint.id} for project {project_id}: {checkpoint.name}")
+
+# On checkpoint deletion
+logger.info(f"Deleted checkpoint {checkpoint_id} for project {project_id}")
+logger.debug(f"Deleted database backup: {db_backup_path}")
+logger.debug(f"Deleted context snapshot: {context_snapshot_path}")
+
+# On checkpoint restore
+logger.info(f"Restored checkpoint {checkpoint_id} for project {project_id}")
+
+# On errors
+logger.error(f"Failed to create checkpoint for project {project_id}: {e}", exc_info=True)
+logger.error(f"Failed to restore checkpoint {checkpoint_id}: {e}", exc_info=True)
+```
+
+## Security Considerations
+
+1. **Project Ownership Validation**: All endpoints verify checkpoint belongs to specified project
+2. **File Path Safety**: Uses `Path` objects to prevent directory traversal
+3. **Database Transactions**: All database operations use proper transaction handling
+4. **Error Sanitization**: Internal errors logged but sanitized messages returned to client
+
+## Future Enhancements
+
+Potential improvements for Phase 5+:
+
+1. **Pagination**: Add `limit` and `offset` query params to list endpoint
+2. **Filtering**: Add `trigger` and `date_range` filters to list endpoint
+3. **WebSocket Events**: Broadcast checkpoint creation/deletion/restore events
+4. **Async Restore**: Run restore in background task for large checkpoints
+5. **Compression**: Compress database backups and context snapshots
+6. **Retention Policy**: Auto-delete old checkpoints after N days
+7. **Access Control**: Add user/role-based permissions for checkpoint operations
+
+## Testing Checklist
+
+- [ ] List checkpoints for valid project
+- [ ] List checkpoints for non-existent project (404)
+- [ ] Create checkpoint with valid data
+- [ ] Create checkpoint with missing workspace (500)
+- [ ] Get checkpoint by valid ID
+- [ ] Get checkpoint by invalid ID (404)
+- [ ] Get checkpoint from wrong project (404)
+- [ ] Delete checkpoint by valid ID
+- [ ] Delete checkpoint by invalid ID (404)
+- [ ] Delete checkpoint with missing files (should succeed with warnings)
+- [ ] Restore checkpoint with confirm=false (diff preview)
+- [ ] Restore checkpoint with confirm=true (actual restore)
+- [ ] Restore checkpoint with missing backup files (500)
+- [ ] Restore checkpoint from wrong project (404)
+
+## Implementation Notes
+
+### Why 202 Accepted for Restore?
+The restore endpoint returns 202 Accepted (not 200 OK) when `confirm_restore=true` because:
+- Restore operations modify git state and database
+- Operations may take several seconds for large projects
+- Follows REST conventions for long-running operations
+- Allows future migration to background task processing
+
+### Why Separate Diff and Restore?
+Two-phase restore (diff preview + confirm) prevents accidental data loss:
+1. User requests restore with `confirm_restore=false`
+2. API returns git diff showing what will change
+3. User reviews diff and decides to proceed
+4. User requests restore with `confirm_restore=true`
+5. API performs actual restore
+
+This matches the UX pattern used by git itself (`git diff` before `git checkout`).