diff --git a/spiffworkflow-backend/migrations/versions/907bcf0c3d75_.py b/spiffworkflow-backend/migrations/versions/22212a7d6505_.py
similarity index 98%
rename from spiffworkflow-backend/migrations/versions/907bcf0c3d75_.py
rename to spiffworkflow-backend/migrations/versions/22212a7d6505_.py
index 552afe48..f662f583 100644
--- a/spiffworkflow-backend/migrations/versions/907bcf0c3d75_.py
+++ b/spiffworkflow-backend/migrations/versions/22212a7d6505_.py
@@ -1,8 +1,8 @@
 """empty message
 
-Revision ID: 907bcf0c3d75
+Revision ID: 22212a7d6505
 Revises: 
-Create Date: 2022-12-28 13:52:13.030028
+Create Date: 2023-01-23 10:59:17.365694
 
 """
 from alembic import op
@@ -10,7 +10,7 @@ import sqlalchemy as sa
 
 
 # revision identifiers, used by Alembic.
-revision = '907bcf0c3d75'
+revision = '22212a7d6505'
 down_revision = None
 branch_labels = None
 depends_on = None
@@ -269,7 +269,8 @@ def upgrade():
     sa.Column('task_json', sa.JSON(), nullable=False),
     sa.Column('timestamp', sa.DECIMAL(precision=17, scale=6), nullable=False),
     sa.ForeignKeyConstraint(['process_instance_id'], ['process_instance.id'], ),
-    sa.PrimaryKeyConstraint('id')
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('process_instance_id', 'spiff_step', name='process_instance_id_spiff_step')
     )
     op.create_table('human_task_user',
     sa.Column('id', sa.Integer(), nullable=False),
diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/models/spiff_step_details.py b/spiffworkflow-backend/src/spiffworkflow_backend/models/spiff_step_details.py
index 50bf4520..0d0e7b44 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/models/spiff_step_details.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/models/spiff_step_details.py
@@ -2,6 +2,7 @@
 from dataclasses import dataclass
 
 from sqlalchemy import ForeignKey
+from sqlalchemy import UniqueConstraint
 from sqlalchemy.orm import deferred
 
 from spiffworkflow_backend.models.db import db
@@ -14,17 +15,16 @@ class SpiffStepDetailsModel(SpiffworkflowBaseDBModel):
     """SpiffStepDetailsModel."""
 
     __tablename__ = "spiff_step_details"
+    __table_args__ = (
+        UniqueConstraint(
+            "process_instance_id", "spiff_step", name="process_instance_id_spiff_step"
+        ),
+    )
+
     id: int = db.Column(db.Integer, primary_key=True)
     process_instance_id: int = db.Column(
         ForeignKey(ProcessInstanceModel.id), nullable=False  # type: ignore
     )
-    # human_task_id: int = db.Column(
-    #     ForeignKey(HumanTaskModel.id)  # type: ignore
-    # )
     spiff_step: int = db.Column(db.Integer, nullable=False)
     task_json: dict = deferred(db.Column(db.JSON, nullable=False))  # type: ignore
     timestamp: float = db.Column(db.DECIMAL(17, 6), nullable=False)
-    # completed_by_user_id: int = db.Column(db.Integer, nullable=True)
-    # lane_assignment_id: Optional[int] = db.Column(
-    #     ForeignKey(GroupModel.id), nullable=True
-    # )