232 lines
8.3 KiB
Markdown
232 lines
8.3 KiB
Markdown
# Delete Command Implementation
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## Summary
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Successfully implemented a robust `delete` command for llmemory that allows flexible deletion of memories by various criteria. The implementation follows TDD principles, matches existing code patterns, and includes comprehensive safety features.
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## Implementation Details
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### Files Created/Modified
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1. **`src/commands/delete.js`** (NEW)
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- Implements `deleteMemories(db, options)` function
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- Supports multiple filter criteria: IDs, tags (AND/OR), LIKE queries, date ranges, agent
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- Includes expired memory handling (exclude by default, include with flag, or only expired)
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- Dry-run mode for safe preview
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- Safety check: requires at least one filter criterion
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2. **`src/cli.js`** (MODIFIED)
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- Added import for `deleteMemories`
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- Added `delete` command with 14 options
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- Confirmation prompt (requires `--force` flag)
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- Support for `--json` and `--markdown` output
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- Helpful error messages for safety violations
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- Updated `--agent-context` help documentation
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3. **`test/integration.test.js`** (MODIFIED)
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- Added 26 comprehensive tests in `describe('Delete Command')` block
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- Tests cover all filter types, combinations, safety features, and edge cases
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- All 65 tests pass (39 original + 26 new)
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## Features
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### Filter Criteria
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- **By IDs**: `--ids 1,2,3` - Delete specific memories by comma-separated IDs
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- **By Tags (AND)**: `--tags test,demo` - Delete memories with ALL specified tags
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- **By Tags (OR)**: `--any-tag test,demo` - Delete memories with ANY specified tag
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- **By Content**: `--query "docker"` - Case-insensitive LIKE search on content
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- **By Date Range**: `--after 2025-01-01 --before 2025-12-31`
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- **By Agent**: `--entered-by test-agent` - Filter by creator
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- **Expired Only**: `--expired-only` - Delete only expired memories
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- **Include Expired**: `--include-expired` - Include expired in other filters
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### Safety Features
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- **Required Filters**: Must specify at least one filter criterion (prevents accidental "delete all")
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- **Confirmation Prompt**: Shows count and requires `--force` flag to proceed
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- **Dry-Run Mode**: `--dry-run` shows what would be deleted without actually deleting
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- **Clear Output**: Shows preview of memories to be deleted with full details
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### Output Formats
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- **Standard**: Colored, formatted output with memory details
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- **JSON**: `--json` for programmatic processing
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- **Markdown**: `--markdown` for documentation
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## Usage Examples
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```bash
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# Preview deletion by tag
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llmemory delete --tags test --dry-run
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# Delete test memories (with confirmation)
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llmemory delete --tags test
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# Shows: "⚠ About to delete 6 memories. Run with --dry-run to preview first, or --force to skip this check."
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# Delete test memories (skip confirmation)
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llmemory delete --tags test --force
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# Delete by specific IDs
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llmemory delete --ids 1,2,3 --force
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# Delete by content query
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llmemory delete --query "docker" --dry-run
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# Delete by agent and tags (combination)
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llmemory delete --entered-by test-agent --tags demo --force
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# Delete expired memories only
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llmemory delete --expired-only --force
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# Delete old memories before date
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llmemory delete --before 2025-01-01 --dry-run
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# Complex query: test memories from specific agent, created after date
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llmemory delete --tags test --entered-by manual --after 2025-10-01 --dry-run
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```
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## Design Decisions
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### 1. Keep Prune Separate ✅
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**Decision**: Created separate `delete` command instead of extending `prune`
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**Rationale**:
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- Semantic clarity: "prune" implies expired/old data, "delete" is general-purpose
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- Single responsibility: Each command does one thing well
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- Better UX: "delete by tags" reads more naturally than "prune by tags"
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### 2. Require At Least One Filter ✅
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**Decision**: Throw error if no filter criteria provided
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**Rationale**:
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- Prevents accidental bulk deletion
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- Forces users to be explicit about what they want to delete
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- Safer default behavior
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**Alternative Considered**: Allow `--all` flag for "delete everything" - rejected as too dangerous
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### 3. Exclude Expired by Default ✅
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**Decision**: By default, expired memories are excluded from deletion (consistent with search/list)
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**Rationale**:
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- Consistency: Matches behavior of `search` and `list` commands
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- Logical: Users typically work with active memories
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- Flexibility: Can include expired with `--include-expired` or target only expired with `--expired-only`
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### 4. Reuse Search Query Logic ✅
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**Decision**: Adopted same query-building patterns as `search.js`
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**Rationale**:
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- Consistency: Users familiar with search filters can use same syntax
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- Proven: Search query logic already tested and working
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- Maintainability: Similar code structure makes maintenance easier
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**Future Refactoring**: Could extract query-building to shared utility in `src/utils/query.js`
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## Test Coverage
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### Test Categories
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1. **Delete by IDs** (4 tests)
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- Single ID, multiple IDs, non-existent IDs, mixed valid/invalid
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2. **Delete by Tags** (5 tests)
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- Single tag, multiple tags (AND), OR logic, no matches
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3. **Delete by Content** (3 tests)
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- LIKE query, case-insensitive, partial matches
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4. **Delete by Date Range** (3 tests)
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- Before date, after date, date range (both)
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5. **Delete by Agent** (2 tests)
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- By agent, agent + tags combination
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6. **Expired Memory Handling** (3 tests)
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- Exclude expired (default), include expired, expired only
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7. **Dry Run Mode** (2 tests)
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- Doesn't delete, includes memory details
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8. **Safety Features** (2 tests)
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- Requires filter, handles empty results
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9. **Combination Filters** (3 tests)
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- Tags + query, agent + date, all filters
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### Test Results
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```
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✓ test/integration.test.js (65 tests) 56ms
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Test Files 1 passed (1)
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Tests 65 passed (65)
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```
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## Performance
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- Delete operations are fast (uses indexed queries)
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- Transaction-safe: Deletion happens in SQLite transaction
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- CASCADE delete: Related tags cleaned up automatically via foreign keys
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- No performance degradation observed with 100+ memories
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## Comparison with Prune
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| Feature | Prune | Delete |
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|---------|-------|--------|
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| Purpose | Remove expired memories | Remove by any criteria |
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| Default behavior | Expired only | Requires explicit filters |
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| Filter by tags | ❌ | ✅ |
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| Filter by content | ❌ | ✅ |
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| Filter by agent | ❌ | ✅ |
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| Filter by date | Before date only | Before, after, or range |
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| Filter by IDs | ❌ | ✅ |
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| Include/exclude expired | N/A (always expired) | Configurable |
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| Dry-run | ✅ | ✅ |
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| Confirmation | ✅ | ✅ |
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## Future Enhancements (Not Implemented)
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1. **Interactive Mode**: `--interactive` to select from list
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2. **Backup Before Delete**: `--backup <file>` to export before deletion
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3. **Regex Support**: `--regex` for pattern matching
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4. **Undo/Restore**: Soft delete with restore capability
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5. **Batch Limits**: `--limit` to cap deletion count
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6. **Query DSL**: More advanced query language
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## Lessons Learned
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1. **TDD Works**: Writing tests first helped catch edge cases early
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2. **Pattern Reuse**: Adopting search.js patterns saved time and ensured consistency
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3. **Safety First**: Confirmation prompts and dry-run are essential for destructive operations
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4. **Clear Errors**: Helpful error messages (like listing available filters) improve UX
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5. **Semantic Clarity**: Separate commands with clear purposes better than multi-purpose commands
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## Testing Checklist
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- [x] Unit tests for all filter types
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- [x] Combination filter tests
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- [x] Dry-run mode tests
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- [x] Safety feature tests
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- [x] CLI integration tests
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- [x] Manual testing with real database
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- [x] Help text verification
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- [x] Error message clarity
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- [x] Output format tests (JSON, Markdown)
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- [x] Confirmation prompt behavior
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## Documentation Updates
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- [x] CLI help text (`llmemory delete --help`)
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- [x] Agent context help (`llmemory --agent-context`)
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- [x] This implementation document
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- [ ] Update SPECIFICATION.md (future)
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- [ ] Update README.md examples (future)
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## Conclusion
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The delete command implementation is **complete and production-ready**. It provides:
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- ✅ Flexible deletion by multiple criteria
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- ✅ Comprehensive safety features
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- ✅ Consistent with existing commands
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- ✅ Thoroughly tested (26 new tests, all passing)
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- ✅ Well-documented with clear help text
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- ✅ Follows TDD principles
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The implementation successfully addresses all requirements from the original investigation and provides a robust, safe tool for managing llmemory data.
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