diff --git a/migrations/versions/bec71f7dc652_.py b/migrations/versions/bec71f7dc652_.py
new file mode 100644
index 00000000..34872c90
--- /dev/null
+++ b/migrations/versions/bec71f7dc652_.py
@@ -0,0 +1,63 @@
+"""empty message
+
+Revision ID: bec71f7dc652
+Revises: 23c62c933848
+Create Date: 2020-05-28 20:08:45.891406
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'bec71f7dc652'
+down_revision = '23c62c933848'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+
+    op.create_table('workflow_spec_dependency_file',
+    sa.Column('file_data_id', sa.Integer(), nullable=False),
+    sa.Column('workflow_id', sa.Integer(), nullable=False),
+    sa.ForeignKeyConstraint(['file_data_id'], ['file_data.id'], ),
+    sa.ForeignKeyConstraint(['workflow_id'], ['workflow.id'], ),
+    sa.PrimaryKeyConstraint('file_data_id', 'workflow_id')
+    )
+    op.drop_column('approval', 'workflow_hash')
+    op.execute(
+        """
+        delete from approval_file;
+        delete from approval;
+        """
+    )
+    op.add_column('approval_file', sa.Column('file_data_id', sa.Integer(), nullable=False))
+    op.drop_constraint('approval_file_file_id_fkey', 'approval_file', type_='foreignkey')
+    op.create_foreign_key(None, 'approval_file', 'file_data', ['file_data_id'], ['id'])
+    op.drop_column('approval_file', 'id')
+    op.drop_column('approval_file', 'file_version')
+    op.drop_column('approval_file', 'file_id')
+    op.drop_column('file', 'latest_version')
+    op.add_column('file_data', sa.Column('date_created', sa.DateTime(timezone=True), nullable=True))
+    op.drop_column('file_data', 'last_updated')
+    op.drop_column('workflow', 'spec_version')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('workflow', sa.Column('spec_version', sa.VARCHAR(), autoincrement=False, nullable=True))
+    op.add_column('file_data', sa.Column('last_updated', postgresql.TIMESTAMP(timezone=True), autoincrement=False, nullable=True))
+    op.drop_column('file_data', 'date_created')
+    op.add_column('file', sa.Column('latest_version', sa.INTEGER(), autoincrement=False, nullable=True))
+    op.add_column('approval_file', sa.Column('file_id', sa.INTEGER(), autoincrement=False, nullable=False))
+    op.add_column('approval_file', sa.Column('file_version', sa.INTEGER(), autoincrement=False, nullable=False))
+    op.add_column('approval_file', sa.Column('id', sa.INTEGER(), autoincrement=True, nullable=False))
+    op.drop_constraint(None, 'approval_file', type_='foreignkey')
+    op.create_foreign_key('approval_file_file_id_fkey', 'approval_file', 'file', ['file_id'], ['id'])
+    op.drop_column('approval_file', 'file_data_id')
+    op.add_column('approval', sa.Column('workflow_hash', sa.VARCHAR(), autoincrement=False, nullable=True))
+    op.drop_table('workflow_spec_dependency_file')
+    # ### end Alembic commands ###