refac/enh: add performance indexes

Co-Authored-By: decent-engineer-decent-datascientist <77806775+decent-engineer-decent-datascientist@users.noreply.github.com>

backend/open_webui/models/functions.py

@@ -6,7 +6,7 @@ from open_webui.internal.db import Base, JSONField, get_db
 from open_webui.models.users import Users
 from open_webui.env import SRC_LOG_LEVELS
 from pydantic import BaseModel, ConfigDict
-from sqlalchemy import BigInteger, Boolean, Column, String, Text
+from sqlalchemy import BigInteger, Boolean, Column, String, Text, Index
 
 log = logging.getLogger(__name__)
 log.setLevel(SRC_LOG_LEVELS["MODELS"])
@@ -31,6 +31,8 @@ class Function(Base):
     updated_at = Column(BigInteger)
     created_at = Column(BigInteger)
 
+    __table_args__ = (Index("is_global_idx", "is_global"),)
+
 
 class FunctionMeta(BaseModel):
     description: Optional[str] = None