Initial commit: AI Video Assistant fullstack platform.

Add pipecat-based backend with WebRTC/WS voice routes, Next.js frontend, and Docker Compose orchestration.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/db/models.py

@@ -0,0 +1,56 @@
+"""数据表定义(SQLAlchemy 2.0)。
+
+两张表,职责分离(见设计):
+  - ProviderCredential:模型凭证(key 明文存,同 dograh,靠 DB 访问控制兜底;读时打码)
+  - Assistant:助手配置,**只存模型/音色的"选项名",不嵌 key**
+
+助手运行时再用 kind 去 ProviderCredential 取真 key(services/config_resolver.py)。
+"""
+
+from datetime import datetime
+
+from sqlalchemy import Boolean, DateTime, String, func
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class ProviderCredential(Base):
+    """模型资源凭证。字段对齐前端 ComponentsModelsPage 的 ModelResource。"""
+
+    __tablename__ = "provider_credentials"
+
+    id: Mapped[str] = mapped_column(String(40), primary_key=True)   # model_xxx
+    name: Mapped[str] = mapped_column(String(128), default="")      # 资源名称,如 "DeepSeek-V3"
+    model_id: Mapped[str] = mapped_column(String(128), default="")  # 模型ID,如 "deepseek-chat"
+    type: Mapped[str] = mapped_column(String(16), index=True)       # LLM|ASR|TTS|Realtime|Embedding
+    interface_type: Mapped[str] = mapped_column(String(32), default="openai")  # openai|xfyun|dashscope|gemini
+    api_url: Mapped[str] = mapped_column(String(512), default="")
+    api_key: Mapped[str] = mapped_column(String(512), default="")   # 明文
+    # 同一 type 下的默认凭证(后端解析用;前端 ModelResource 无此字段,留作可选)
+    is_default: Mapped[bool] = mapped_column(Boolean, default=False)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+
+class Assistant(Base):
+    __tablename__ = "assistants"
+
+    id: Mapped[str] = mapped_column(String(40), primary_key=True)  # asst_xxx
+    name: Mapped[str] = mapped_column(String(128))
+    greeting: Mapped[str] = mapped_column(String(2048), default="")
+    prompt: Mapped[str] = mapped_column(String(8192), default="")
+    runtime_mode: Mapped[str] = mapped_column(String(16), default="pipeline")
+    # 模型/音色的"选项名",不是 key
+    model: Mapped[str] = mapped_column(String(128), default="")
+    asr: Mapped[str] = mapped_column(String(128), default="")
+    voice: Mapped[str] = mapped_column(String(128), default="")
+    enable_interrupt: Mapped[bool] = mapped_column(Boolean, default=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )

backend/db/session.py

@@ -0,0 +1,29 @@
+"""异步数据库引擎 + 会话。
+
+- engine / SessionLocal:全局单例
+- get_session:FastAPI 依赖,按请求注入一个会话
+- init_db:启动时建表(MVP 用 create_all;表结构稳定后切 alembic 迁移,对齐 dograh)
+"""
+
+from collections.abc import AsyncGenerator
+
+import config
+from db.models import Base
+from sqlalchemy.ext.asyncio import (
+    AsyncSession,
+    async_sessionmaker,
+    create_async_engine,
+)
+
+engine = create_async_engine(config.DATABASE_URL, echo=False, pool_pre_ping=True)
+SessionLocal = async_sessionmaker(engine, expire_on_commit=False)
+
+
+async def get_session() -> AsyncGenerator[AsyncSession, None]:
+    async with SessionLocal() as session:
+        yield session
+
+
+async def init_db() -> None:
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)