fix: update comments for schema handling in SQLite and PostgreSQL

- Changed comment in db.py to clarify setting schema to None for SQLite.
- Updated comment in env.py to specify that schema settings are applied only in PostgreSQL.

backend/open_webui/internal/db.py

@@ -100,7 +100,7 @@ else:
 SessionLocal = sessionmaker(
     autocommit=False, autoflush=False, bind=engine, expire_on_commit=False
 )
-# SQLite를 사용하는 경우 스키마를 None으로 설정
+# Set schema to None if using SQLite
 if "sqlite" in SQLALCHEMY_DATABASE_URL:
     metadata_obj = MetaData(schema=None)
 else:

backend/open_webui/migrations/env.py

@@ -78,7 +78,7 @@ def run_migrations_online() -> None:
 
     with connectable.connect() as connection:
         if target_metadata.schema and connection.dialect.name == 'postgresql':
-            # PostgreSQL에서만 스키마 설정 적용
+            # Applying schema settings only in PostgreSQL
             connection.execute(
                 text(f"SET search_path TO {target_metadata.schema}, public")
             )