Files
BiliNote/backend/app/db/engine.py
huangjianwu c105342ded fix: 性能优化、前端转写器配置、任务进度丢失及 MLX Whisper 回退问题修复
### 性能优化
- 后端任务执行从串行锁改为 ThreadPoolExecutor 并发执行(默认3线程)
- 添加 GZipMiddleware 响应压缩 + Nginx gzip 配置
- 数据库连接池参数优化(pool_size=10, max_overflow=20)
- 视频帧提取并行化(ThreadPoolExecutor)
- LLM 重试配置缓存到实例,避免每次请求读 env var
- 前端路由级代码拆分(React.lazy + Suspense)
- Vite manualChunks 拆分 markdown/markmap/vendor
- MarkdownViewer 用 React.memo + useMemo 减少不必要渲染
- NoteHistory Fuse.js 实例 useMemo 缓存
- useTaskPolling 无待处理任务时跳过轮询
- 移除 antd 依赖(NoteForm Alert、modelForm Tag),改用 shadcn/ui

### 前端转写器配置(新功能)
- 新增 TranscriberConfigManager(JSON 文件存储,替代环境变量)
- 新增 GET/POST /transcriber_config API 端点
- 新增 GET /transcriber_models_status 模型下载状态查询
- 新增 POST /transcriber_download 后台模型下载触发
- 前端转写器设置页面:引擎选择、模型大小选择、模型下载管理
- deploy_status 端点同步从配置文件读取

### Bug 修复
- 修复任务进行中切换页面后进度丢失:Home.tsx status 派生逻辑补全中间状态
- 修复 MLX Whisper 静默回退 fast-whisper:移除环境变量门控,macOS 下自动尝试导入
- MLX Whisper 不可用时抛出 RuntimeError 而非静默回退
- 前端展示 MLX Whisper 可用性状态,不可用时禁用保存

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-23 14:09:34 +08:00

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import os
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from dotenv import load_dotenv
load_dotenv()
# 默认 SQLite如果想换 PostgreSQL 或 MySQL可以直接改 .env
DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///bili_note.db")
# SQLite 需要特定连接参数,其他数据库不需要
engine_args = {}
if DATABASE_URL.startswith("sqlite"):
engine_args["connect_args"] = {"check_same_thread": False}
_pool_args = {}
if not DATABASE_URL.startswith("sqlite"):
_pool_args = {
"pool_size": int(os.getenv("DB_POOL_SIZE", "10")),
"max_overflow": int(os.getenv("DB_MAX_OVERFLOW", "20")),
"pool_pre_ping": True,
}
engine = create_engine(
DATABASE_URL,
echo=os.getenv("SQLALCHEMY_ECHO", "false").lower() == "true",
**engine_args,
**_pool_args,
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()
def get_engine():
return engine
def get_db():
db = SessionLocal()
try:
yield db
finally:
db.close()