diff --git a/backend/alembic/versions/6368515778c5_add_auth_method_to_person.py b/backend/alembic/versions/6368515778c5_add_auth_method_to_person.py
new file mode 100644
index 00000000..d93afeba
--- /dev/null
+++ b/backend/alembic/versions/6368515778c5_add_auth_method_to_person.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+"""add auth_method to person
+
+Revision ID: 6368515778c5
+Revises: cd7de470586e
+Create Date: 2022-12-17 17:57:33.022549
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "6368515778c5"
+down_revision = "cd7de470586e"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column("person", sa.Column("auth_method", sa.String(length=128), nullable=True))
+    op.execute("UPDATE person SET auth_method = 'local'")
+    op.alter_column("person", "auth_method", nullable=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("person", "auth_method")
+    # ### end Alembic commands ###
diff --git a/backend/app/ocgpt/models/person.py b/backend/app/ocgpt/models/person.py
index e66db5e3..57f134a4 100644
--- a/backend/app/ocgpt/models/person.py
+++ b/backend/app/ocgpt/models/person.py
@@ -18,6 +18,7 @@ class Person(SQLModel, table=True):
         ),
     )
     username: str = Field(nullable=False, max_length=128)
+    auth_method: str = Field(nullable=False, max_length=128, default="local")
     display_name: str = Field(nullable=False, max_length=256)
     created_date: Optional[datetime] = Field(
         sa_column=sa.Column(sa.DateTime(), nullable=False, server_default=sa.func.current_timestamp())
diff --git a/backend/app/ocgpt/prompt_repository.py b/backend/app/ocgpt/prompt_repository.py
index 7b39d0b8..8c621df1 100644
--- a/backend/app/ocgpt/prompt_repository.py
+++ b/backend/app/ocgpt/prompt_repository.py
@@ -22,7 +22,13 @@ class PromptRepository:
         if not user:
             return None
         person: Person = (
-            self.db.query(Person).filter(Person.api_client_id == self.api_client.id, Person.username == user.id).first()
+            self.db.query(Person)
+            .filter(
+                Person.api_client_id == self.api_client.id,
+                Person.username == user.id,
+                Person.auth_method == user.auth_method,
+            )
+            .first()
         )
         if person is None:
             # user is unknown, create new record