first commit: TTS Book Service with MiMo TTS integration

app/models.py

@@ -0,0 +1,42 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, func
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+import config
+
+engine = create_async_engine(config.DATABASE_URL, echo=False)
+async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class Book(Base):
+    __tablename__ = "books"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    book_id = Column(String(100), unique=True, nullable=False, index=True)  # 平台书籍ID
+    title = Column(String(500), nullable=False)  # 书名
+    author = Column(String(200), default="")  # 作者
+    created_at = Column(DateTime, server_default=func.now())
+
+
+class Chapter(Base):
+    __tablename__ = "chapters"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    book_id = Column(String(100), nullable=False, index=True)  # 关联的书籍ID
+    chapter_id = Column(String(100), nullable=False, index=True)  # 平台音频ID
+    app_chapter_id = Column(String(100), default="")  # App章节ID
+    title = Column(String(500), default="")  # 章节标题
+    text_content = Column(Text, default="")  # TTS 文本内容
+    audio_file = Column(String(500), default="")  # 生成的音频文件路径
+    status = Column(String(20), default="pending")  # pending / generating / ready / error
+    error_msg = Column(Text, default="")
+    created_at = Column(DateTime, server_default=func.now())
+    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())
+
+
+async def init_db():
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)