diff --git a/datajunction-server/datajunction_server/alembic/versions/2025_05_14_1545-cb7368a4bfae_change_enum_columns_to_string_type.py b/datajunction-server/datajunction_server/alembic/versions/2025_05_14_1545-cb7368a4bfae_change_enum_columns_to_string_type.py
new file mode 100644
index 000000000..3d6bf7ccb
--- /dev/null
+++ b/datajunction-server/datajunction_server/alembic/versions/2025_05_14_1545-cb7368a4bfae_change_enum_columns_to_string_type.py
@@ -0,0 +1,102 @@
+"""Change enum columns to string type
+
+Revision ID: cb7368a4bfae
+Revises: 51547dcccb10
+Create Date: 2025-05-14 15:45:43.734154+00:00
+
+"""
+# pylint: disable=no-member, invalid-name, missing-function-docstring, unused-import, no-name-in-module
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = "cb7368a4bfae"
+down_revision = "51547dcccb10"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table("history", schema=None) as batch_op:
+        batch_op.alter_column(
+            "entity_type",
+            existing_type=postgresql.ENUM(
+                "ATTRIBUTE",
+                "AVAILABILITY",
+                "BACKFILL",
+                "CATALOG",
+                "COLUMN_ATTRIBUTE",
+                "DEPENDENCY",
+                "ENGINE",
+                "LINK",
+                "MATERIALIZATION",
+                "NAMESPACE",
+                "NODE",
+                "PARTITION",
+                "QUERY",
+                "TAG",
+                name="entitytype",
+            ),
+            type_=sa.String(length=20),
+            existing_nullable=True,
+        )
+        batch_op.alter_column(
+            "activity_type",
+            existing_type=postgresql.ENUM(
+                "CREATE",
+                "DELETE",
+                "RESTORE",
+                "UPDATE",
+                "REFRESH",
+                "TAG",
+                "SET_ATTRIBUTE",
+                "STATUS_CHANGE",
+                name="activitytype",
+            ),
+            type_=sa.String(length=20),
+            existing_nullable=True,
+        )
+
+
+def downgrade():
+    with op.batch_alter_table("history", schema=None) as batch_op:
+        batch_op.alter_column(
+            "activity_type",
+            existing_type=sa.String(length=20),
+            type_=postgresql.ENUM(
+                "CREATE",
+                "DELETE",
+                "RESTORE",
+                "UPDATE",
+                "REFRESH",
+                "TAG",
+                "SET_ATTRIBUTE",
+                "STATUS_CHANGE",
+                name="activitytype",
+            ),
+            existing_nullable=True,
+        )
+        batch_op.alter_column(
+            "entity_type",
+            existing_type=sa.String(length=20),
+            type_=postgresql.ENUM(
+                "ATTRIBUTE",
+                "AVAILABILITY",
+                "BACKFILL",
+                "CATALOG",
+                "COLUMN_ATTRIBUTE",
+                "DEPENDENCY",
+                "ENGINE",
+                "LINK",
+                "MATERIALIZATION",
+                "NAMESPACE",
+                "NODE",
+                "PARTITION",
+                "QUERY",
+                "TAG",
+                name="entitytype",
+            ),
+            existing_nullable=True,
+        )
diff --git a/datajunction-server/datajunction_server/database/history.py b/datajunction-server/datajunction_server/database/history.py
index e5ffd5f07..4dc8da1fd 100644
--- a/datajunction-server/datajunction_server/database/history.py
+++ b/datajunction-server/datajunction_server/database/history.py
@@ -8,7 +8,6 @@
     JSON,
     BigInteger,
     DateTime,
-    Enum,
     Index,
     Integer,
     String,
@@ -16,7 +15,6 @@
 from sqlalchemy.orm import Mapped, mapped_column
 
 from datajunction_server.database.base import Base
-from datajunction_server.internal.history import ActivityType, EntityType
 from datajunction_server.typing import UTCDatetime
 
 
@@ -35,14 +33,14 @@ class History(Base):
         BigInteger().with_variant(Integer, "sqlite"),
         primary_key=True,
     )
-    entity_type: Mapped[Optional[EntityType]] = mapped_column(
-        Enum(EntityType),
+    entity_type: Mapped[Optional[str]] = mapped_column(
+        String(20),
         default=None,
     )
     entity_name: Mapped[Optional[str]] = mapped_column(String, default=None)
     node: Mapped[Optional[str]] = mapped_column(String, default=None)
-    activity_type: Mapped[Optional[ActivityType]] = mapped_column(
-        Enum(ActivityType),
+    activity_type: Mapped[Optional[str]] = mapped_column(
+        String(20),
         default=None,
     )
     user: Mapped[Optional[str]] = mapped_column(String, default=None)