diff --git a/alembic/versions/1f1d3d560ccb_db_defaults_enum_binding_for_uploaded_.py b/alembic/versions/1f1d3d560ccb_db_defaults_enum_binding_for_uploaded_.py
new file mode 100644
index 0000000..9457a12
--- /dev/null
+++ b/alembic/versions/1f1d3d560ccb_db_defaults_enum_binding_for_uploaded_.py
@@ -0,0 +1,46 @@
+"""db defaults + enum binding for uploaded_files
+
+Revision ID: 1f1d3d560ccb
+Revises: 270ba252bc11
+Create Date: 2025-08-14 17:11:41.866908
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = '1f1d3d560ccb'
+down_revision: Union[str, None] = '270ba252bc11'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('uploaded_files', 's3_file_upload_timestamp',
+               existing_type=postgresql.TIMESTAMP(),
+               type_=sa.DateTime(timezone=True),
+               existing_nullable=False)
+    op.alter_column('uploaded_files', 's3_json_upload_timestamp',
+               existing_type=postgresql.TIMESTAMP(),
+               type_=sa.DateTime(timezone=True),
+               existing_nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('uploaded_files', 's3_json_upload_timestamp',
+               existing_type=sa.DateTime(timezone=True),
+               type_=postgresql.TIMESTAMP(),
+               existing_nullable=True)
+    op.alter_column('uploaded_files', 's3_file_upload_timestamp',
+               existing_type=sa.DateTime(timezone=True),
+               type_=postgresql.TIMESTAMP(),
+               existing_nullable=False)
+    # ### end Alembic commands ###
diff --git a/alembic/versions/e8507a27795a_auto_generate_id.py b/alembic/versions/e8507a27795a_auto_generate_id.py
new file mode 100644
index 0000000..3b754ae
--- /dev/null
+++ b/alembic/versions/e8507a27795a_auto_generate_id.py
@@ -0,0 +1,32 @@
+"""auto generate id
+
+Revision ID: e8507a27795a
+Revises: 1f1d3d560ccb
+Create Date: 2025-08-14 17:20:03.632337
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'e8507a27795a'
+down_revision: Union[str, None] = '1f1d3d560ccb'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    pass
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    pass
+    # ### end Alembic commands ###
diff --git a/etl/models/topLevel.py b/etl/models/topLevel.py
index ee958fc..4a06b80 100644
--- a/etl/models/topLevel.py
+++ b/etl/models/topLevel.py
@@ -15,11 +15,11 @@ class BaseModel(SQLModel):
         sa_column=Column(
             UUID(as_uuid=True),
             primary_key=True,
-            server_default=text("gen_random_uuid()"),  # or: text("uuid_generate_v4()")
             nullable=False,
+            server_default=text("gen_random_uuid()"),  # requires pgcrypto extension
         )
     )
-    
+
 # class Buildings(BaseModel, table=True):
 #     address: str
 #     postcode: str