refac: modernize type annotations (PEP 604 / PEP 585)

backend/open_webui/models/messages.py

@@ -3,17 +3,13 @@ import time
 import uuid
 from typing import Optional
 
-from sqlalchemy import select, delete, func
-from sqlalchemy.ext.asyncio import AsyncSession
 from open_webui.internal.db import Base, JSONField, get_async_db_context
-from open_webui.models.tags import TagModel, Tag, Tags
-from open_webui.models.users import Users, User, UserNameResponse
-from open_webui.models.channels import Channels, ChannelMember
-
-
+from open_webui.models.channels import ChannelMember, Channels
+from open_webui.models.tags import Tag, TagModel, Tags
+from open_webui.models.users import User, UserNameResponse, Users
 from pydantic import BaseModel, ConfigDict, field_validator
-from sqlalchemy import BigInteger, Boolean, Column, String, Text, JSON
-from sqlalchemy import or_, func, and_, text
+from sqlalchemy import JSON, BigInteger, Boolean, Column, String, Text, and_, delete, func, or_, select, text
+from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.sql import exists
 
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