Implemented LocalStore class for SQLite-backed storage. ## What was implemented Created client/store.py with a comprehensive LocalStore class that provides SQLite-backed CRUD operations for all entity types. ## Key Features 1. Database Management - Auto-initialization using init_database() from schema.py - Context manager support for proper resource cleanup - WAL mode for concurrent access - Row factory configured to return dictionaries 2. Counter Management - get_next_counter(key) - atomically increments and returns next value - get_counter(key) - returns current value without incrementing - Supports global (issue) and per-project (project:ENG) counters 3. Full CRUD Operations - Issues: create, get, get_by_identifier, update, delete, list - Projects: create, get, get_by_key, update, delete, list - Milestones: create, get, update, delete, list - Comments: create, get, list, delete - Documents: create, get, list, delete - Attachments: create, get, list, delete - Relationships: create, get, list, delete 4. Soft Deletes - All delete operations set deleted_at timestamp - List and get operations automatically exclude deleted records 5. JSON Array Field Handling - Automatically serializes lists to JSON on write - Automatically deserializes JSON to lists on read - Supports filtering by JSON array contents (labels, projects, tags, etc.) 6. Version Management - All update operations increment the version field - Enables conflict detection for future sync implementation 7. Helper Methods - _row_to_dict() - converts SQLite rows to dicts with JSON parsing - get_counts() - returns count of active entities by type ## Test Coverage Created comprehensive test suite in tests/test_local_store.py: - 53 tests covering all functionality - 100% pass rate - Tests for initialization, CRUD operations, soft deletes, version increments, JSON field handling ## Files Changed - client/store.py - LocalStore implementation (1440 lines) - tests/test_local_store.py - Test suite (637 lines) ## Verification All tests passed: 53 passed in 1.11s The LocalStore class is ready for integration with the CLI and provides a drop-in replacement for the JSON-based Store with improved performance and concurrent access support.