## Implementation Complete Successfully implemented the SQLite schema from docs/backend-transition/schema.md. ### What was created: 1. **client/__init__.py** - Package initialization - Exports init_database function for easy access 2. **client/schema.py** (542 lines) - Complete schema implementation - All core entity tables: issues, projects, milestones, comments, documents, attachments, relationships - Counter table for sequential identifiers - Client sync tables: sync_log, sync_state, conflict_log - Server sync table: sync_history (optional via flag) - Schema version tracking table - Database configuration (WAL mode, foreign keys, cache optimization) - All indexes from specification (20+ indexes with partial index support) - All constraints (CHECK, UNIQUE, foreign key references) - Helper functions: - init_database(db_path, include_server_tables) - Initialize DB with all tables - get_schema_version(conn) - Query current schema version - verify_schema(conn) - Verify all expected tables exist 3. **tests/test_schema.py** (446 lines) - Comprehensive test suite - 34 tests covering all aspects of the schema - Tests for database initialization - Tests for all table creation - Tests for index creation - Tests for database configuration (WAL, foreign keys) - Tests for schema version tracking - Tests for constraint enforcement (priority, status, unique constraints, singleton) - All tests passing ### Key implementation details: - Tables match schema.md specification exactly - All JSON array fields use TEXT type with default '[]' - All timestamps stored as TEXT in ISO 8601 UTC format - Soft delete pattern with deleted_at column (NULL = active) - Version tracking for optimistic locking (increments on update) - sync_state table enforces singleton with CHECK constraint - Client ID auto-generated on first init using randomblob - Schema version initialized to 1 ### Test results: All tests passing (34 new schema tests + 355 existing tests) ### Files changed: - client/__init__.py (new) - client/schema.py (new) - tests/test_schema.py (new) ### Git commits: - Commit: c5c148c on branch BT-1 (merged to master) - Pushed to remote This completes the first task of Phase 1 (SQLite Migration). The schema is now ready for use by the LocalStore class (BT-2).