diff --git a/migrations/versions/30_rm_unique_constraint.py b/migrations/versions/30_rm_unique_constraint.py
new file mode 100644
index 000000000..b73f016b5
--- /dev/null
+++ b/migrations/versions/30_rm_unique_constraint.py
@@ -0,0 +1,12 @@
+from alembic import op
+
+revision = '30_rm_unique_constraint'
+down_revision = '20_initialise_data'
+
+
+def upgrade():
+    op.drop_constraint("users_name_key", "users")
+
+
+def downgrade():
+    op.create_unique_constraint("users_name_key", "users", ["name"])
\ No newline at end of file