feat: 初始提交

backend/app/models/llm_config.py

@@ -0,0 +1,17 @@
+from sqlalchemy import ForeignKey, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from ..db.base import Base
+
+
+class LLMConfig(Base):
+    """用户自定义的 LLM 接入配置。"""
+
+    __tablename__ = "llm_configs"
+
+    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), primary_key=True)
+    llm_provider_url: Mapped[str | None] = mapped_column(Text())
+    llm_provider_api_key: Mapped[str | None] = mapped_column(Text())
+    llm_provider_model: Mapped[str | None] = mapped_column(Text())
+
+    user: Mapped["User"] = relationship("User", back_populates="llm_config")