chore: 迁移到 social-app 架构，集成 Supabase 和 taskiq worker

backend/src/models/llm.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+import uuid
+
+from sqlalchemy import ForeignKey, String
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from core.db.base import Base, SoftDeleteMixin, TimestampMixin
+
+
+class Llm(TimestampMixin, SoftDeleteMixin, Base):
+    __tablename__: str = "llms"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    factory_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("llm_factory.id", ondelete="RESTRICT"),
+        nullable=False,
+        index=True,
+    )
+    model_code: Mapped[str] = mapped_column(
+        String(50), nullable=False, unique=True, index=True
+    )