feat(agent-chat): complete core workflow and strengthen auth rate limiting

backend/src/models/llm_factory.py

@@ -0,0 +1,22 @@
+from __future__ import annotations
+
+import uuid
+
+from sqlalchemy import String, Text
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from core.db.base import Base, SoftDeleteMixin, TimestampMixin
+
+
+class LlmFactory(TimestampMixin, SoftDeleteMixin, Base):
+    __tablename__: str = "llm_factory"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    name: Mapped[str] = mapped_column(
+        String(50), nullable=False, unique=True, index=True
+    )
+    request_url: Mapped[str] = mapped_column(String(255), nullable=False)
+    avatar: Mapped[str | None] = mapped_column(Text, nullable=True)