diff --git a/db/migrations/1538580167_remove_bid_id_unique_constraint.down.sql b/db/migrations/1538580167_remove_bid_id_unique_constraint.down.sql
new file mode 100644
index 000000000..33dc29cbf
--- /dev/null
+++ b/db/migrations/1538580167_remove_bid_id_unique_constraint.down.sql
@@ -0,0 +1,5 @@
+ALTER TABLE maker.tend
+ add constraint tend_bid_id_key unique (bid_id);
+
+ALTER TABLE maker.dent
+ add constraint dent_bid_id_key unique (bid_id);
diff --git a/db/migrations/1538580167_remove_bid_id_unique_constraint.up.sql b/db/migrations/1538580167_remove_bid_id_unique_constraint.up.sql
new file mode 100644
index 000000000..65af04c3a
--- /dev/null
+++ b/db/migrations/1538580167_remove_bid_id_unique_constraint.up.sql
@@ -0,0 +1,5 @@
+ALTER TABLE maker.tend
+ drop constraint tend_bid_id_key;
+
+ALTER TABLE maker.dent
+ drop constraint dent_bid_id_key;
diff --git a/db/schema.sql b/db/schema.sql
index 5d950abfb..ff8c6e352 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -1477,14 +1477,6 @@ ALTER TABLE ONLY maker.deal
     ADD CONSTRAINT deal_pkey PRIMARY KEY (id);
 
 
---
--- Name: dent dent_bid_id_key; Type: CONSTRAINT; Schema: maker; Owner: -
---
-
-ALTER TABLE ONLY maker.dent
-    ADD CONSTRAINT dent_bid_id_key UNIQUE (bid_id);
-
-
 --
 -- Name: dent dent_header_id_tx_idx_key; Type: CONSTRAINT; Schema: maker; Owner: -
 --
@@ -1677,14 +1669,6 @@ ALTER TABLE ONLY maker.price_feeds
     ADD CONSTRAINT price_feeds_pkey PRIMARY KEY (id);
 
 
---
--- Name: tend tend_bid_id_key; Type: CONSTRAINT; Schema: maker; Owner: -
---
-
-ALTER TABLE ONLY maker.tend
-    ADD CONSTRAINT tend_bid_id_key UNIQUE (bid_id);
-
-
 --
 -- Name: tend tend_header_id_tx_idx_key; Type: CONSTRAINT; Schema: maker; Owner: -
 --