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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [2.0.1] - 2025-04-08
+
+### Fixed
+- `JsonDumpsEncoder` now handles `NaTType` (pandas NaT) without throwing TypeError
+- CORS `Access-Control-Allow-Origin` now defaults to `"*"` instead of echoing the request Origin header (security fix)
+- `RbacUser.can()` correctly handles empty permission list
+- Fixed race condition in `aio_pool.py` when task queue is full under high concurrency
+
+### Changed
+- Refactored `config.py` — `get_config()` now consistently returns `None` instead of raising on missing optional keys (use `default` parameter for fallback)
+- Upgraded minimum Python version from 3.9 to 3.11
+- `pyproject.toml` dependencies cleaned up — core dependencies slimmed down; pandas/numpy/matplotlib/opencv moved to `[project.optional-dependencies]`
+
+### Removed
+- Deprecated `web/legacy_session.py` — use JWT-based `@auth_token` decorator instead
+
+## [2.0.0] - 2025-03-15
+
+### Added
+- **Swagger UI auto-generation** (`ApplicationSwagger`) — fully inferred from handler route patterns and decorators
+- **Redis StreamActor** — consumer-group-based message processing with automatic zombie task recovery
+- **ParamAwareUIModule** — async data pre-loading for Tornado UIModules
+- **RBAC with dynamic rules** — rules are serialized Python classes stored in DB, supporting time-based, IP-based, and custom rule chains
+- **Snowflake ID generator** (`snow_id.py`) — thread-safe, no external dependency, 10K+ IDs/sec
+- **Auto-loading handlers** — `Application.load_handlers()` discovers all handlers in a package via `route_pattern` attribute
+- **BaseX encoder/decoder** (`encoder.py`) — auto-detect Base16/32/64/85 + zlib decompression
+- **Async DB engine** — SQLAlchemy async session factory with `aiomysql` / `aiosqlite` support
+- **Task service with daemonization** — `TaskService` with PID file, start/stop/status commands, and graceful shutdown
+- **5 complete examples** under `examples/` — HelloWorld, background tasks, Redis streams, scheduled services, model generation
+- **pytest test suite** — unit tests (mocked) + integration tests for DB, Redis, RBAC
+
+### Changed
+- Complete project restructuring: introduced `web/`, `core/`, `db/`, `rbac/`, `util/`, `service/` package layout
+- `Application` now inherits from `tornado.web.Application` — backward-incompatible refactor from v1.x
+- `RequestHandler.response_ok()` and `response_error()` now use `JsonDumpsEncoder` by default
+- Logging system rewritten — supports rotating file handlers, per-module loggers, console output
+
+### Removed
+- All v1.x code — this is a ground-up rewrite
+
+## [1.0.0] - 2024-01-01
+
+### Added
+- Initial release with basic Tornado wrapper
+- Basic JWT auth and password hashing
+- Simple `config.json` loader
+- Minimal utility functions
+
+> ⚠️ **Note:** v1.0.0 is deprecated and no longer maintained. Please upgrade to v2.0.0+.