| 1234567891011121314151617181920212223 | from sqlalchemy import Indexfrom sqlmodel import Fieldfrom app.models.base_model import BaseModel, TimeStampMixin, PrimaryKeyMixinclass AssistantFileBase(BaseModel):    __table_args__ = (Index("assistant_file_assistant_id_id_idx", "assistant_id", "id"),)    assistant_id: str = Field(nullable=False)    object: str = Field(nullable=False, default="assistant.file")class AssistantFile(AssistantFileBase, PrimaryKeyMixin, TimeStampMixin, table=True):    passclass AssistantFileCreate(AssistantFileBase):    passclass AssistantFileUpdate(BaseModel, PrimaryKeyMixin, TimeStampMixin):    pass
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