diff --git a/alembic/versions/ffba7564d918_initialise_base_database_structure.py b/alembic/versions/1a69295f277f_initialise_base_database_structure.py
similarity index 98%
rename from alembic/versions/ffba7564d918_initialise_base_database_structure.py
rename to alembic/versions/1a69295f277f_initialise_base_database_structure.py
index 88327fb..e571ef8 100644
--- a/alembic/versions/ffba7564d918_initialise_base_database_structure.py
+++ b/alembic/versions/1a69295f277f_initialise_base_database_structure.py
@@ -1,8 +1,8 @@
 """initialise base database structure
 
-Revision ID: ffba7564d918
+Revision ID: 1a69295f277f
 Revises: 
-Create Date: 2024-03-07 23:24:44.015377
+Create Date: 2024-03-16 12:46:26.532739
 
 """
 from typing import Sequence, Union
@@ -12,7 +12,7 @@
 from sqlalchemy.dialects import postgresql
 
 # revision identifiers, used by Alembic.
-revision: str = 'ffba7564d918'
+revision: str = '1a69295f277f'
 down_revision: Union[str, None] = None
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
@@ -42,7 +42,7 @@ def upgrade() -> None:
     sa.Column('extensions', postgresql.JSONB(astext_type=sa.Text()), nullable=True, comment='If defined, 1 or more data model extensions associated with the ProductFootprint.'),
     sa.PrimaryKeyConstraint('pk')
     )
-    op.create_index(op.f('ix_productfootprint_id'), 'productfootprint', ['id'], unique=False)
+    op.create_index(op.f('ix_productfootprint_id'), 'productfootprint', ['id'], unique=True)
     op.create_table('user',
     sa.Column('id', sa.Integer(), nullable=False),
     sa.Column('username', sa.String(), nullable=False),
diff --git a/db/models/product_footprint.py b/db/models/product_footprint.py
index bf1395f..8878220 100644
--- a/db/models/product_footprint.py
+++ b/db/models/product_footprint.py
@@ -8,7 +8,7 @@
 
 class ProductFootprint(Base):
     pk = Column(Integer, primary_key=True, autoincrement=True)
-    id = Column(String, index=True, comment="The product footprint identifier.")
+    id = Column(String, index=True, unique=True, comment="The product footprint identifier.")
     # need some smarts around this
     precedingPfIds = Column(ARRAY(String), comment="non-empty set of preceding product footprint identifiers without duplicates.")
     specVersion = Column(String, comment="The version of the ProductFootprint data specification.")
diff --git a/tests/test_models/test_product_footprint_model.py b/tests/test_models/test_product_footprint_model.py
index 768130b..5c5e5e3 100644
--- a/tests/test_models/test_product_footprint_model.py
+++ b/tests/test_models/test_product_footprint_model.py
@@ -1,5 +1,8 @@
 from datetime import datetime, timezone
 
+import pytest
+from sqlalchemy.exc import IntegrityError
+
 from db.models.product_footprint import ProductFootprint, ProductFootprintStatus
 from db.models.carbon_footprint import CarbonFootprintModel, ProductOrSectorSpecificRuleModel, EmissionFactorDatasetModel
 from schemas.carbon_footprint import (
@@ -101,3 +104,22 @@ def test_product_footprint_creation(db_session):
 def test_product_footprint_status_values():
     assert ProductFootprintStatus.ACTIVE.value == "Active"
     assert ProductFootprintStatus.DEPRECATED.value == "Deprecated"
+
+
+def test_product_footprint_id_field_is_unique(db_session):
+    # Create a record
+    record1 = ProductFootprint(
+        id="test_for_uniqueness",
+        comment="test"
+    )
+    db_session.add(record1)
+    db_session.commit()
+
+    # Attempt to create another record with the same id
+    record2 = ProductFootprint(
+        id="test_for_uniqueness",
+        comment = "test"
+    )
+    db_session.add(record2)
+    with pytest.raises(IntegrityError, match="duplicate key value violates unique constraint"):
+        db_session.commit()