diff --git a/crud.py b/crud.py
index 0a678e7..b4f5c61 100644
--- a/crud.py
+++ b/crud.py
@@ -87,7 +87,7 @@ async def get_card(card_id: str) -> Optional[Card]:
 
     return Card.parse_obj(card)
 
-
+"""
 async def get_card_by_uid(card_uid: str) -> Optional[Card]:
     row = await db.fetchone(
         "SELECT * FROM boltcards.cards WHERE uid = ?", (card_uid.upper(),)
@@ -98,7 +98,7 @@ async def get_card_by_uid(card_uid: str) -> Optional[Card]:
     card = dict(**row)
 
     return Card.parse_obj(card)
-
+"""
 
 async def get_card_by_external_id(external_id: str) -> Optional[Card]:
     row = await db.fetchone(
diff --git a/migrations.py b/migrations.py
index 43d5bb0..e40f865 100644
--- a/migrations.py
+++ b/migrations.py
@@ -55,3 +55,40 @@ async def m001_initial(db):
         );
     """
     )
+
+async def m002_remove_constraint_unique_uid(db):
+    """
+    Do not check the duplicate UID so remove the constraint from DB.
+    """
+    await db.execute(
+        """
+        CREATE TABLE cardsnew (
+            id TEXT PRIMARY KEY UNIQUE,
+            wallet TEXT NOT NULL,
+            card_name TEXT NOT NULL,
+            uid TEXT NOT NULL,
+            external_id TEXT NOT NULL UNIQUE,
+            counter INT NOT NULL DEFAULT 0,
+            tx_limit TEXT NOT NULL,
+            daily_limit TEXT NOT NULL,
+            enable BOOL NOT NULL,
+            k0 TEXT NOT NULL DEFAULT '00000000000000000000000000000000',
+            k1 TEXT NOT NULL DEFAULT '00000000000000000000000000000000',
+            k2 TEXT NOT NULL DEFAULT '00000000000000000000000000000000',
+            prev_k0 TEXT NOT NULL DEFAULT '00000000000000000000000000000000',
+            prev_k1 TEXT NOT NULL DEFAULT '00000000000000000000000000000000',
+            prev_k2 TEXT NOT NULL DEFAULT '00000000000000000000000000000000',
+            otp TEXT NOT NULL DEFAULT '',
+            time TIMESTAMP NOT NULL DEFAULT """
+            + db.timestamp_now
+            + """
+        );
+        """
+    )
+    await db.execute("INSERT INTO boltcards.cardsnew SELECT * FROM boltcards.cards;")
+    await db.execute("DROP TABLE boltcards.cards;")
+    await db.execute("ALTER TABLE boltcards.cardsnew RENAME TO cards;")
+
+        
+        
+
diff --git a/views_api.py b/views_api.py
index b710518..1aa2490 100644
--- a/views_api.py
+++ b/views_api.py
@@ -12,7 +12,6 @@
     delete_card,
     enable_disable_card,
     get_card,
-    get_card_by_uid,
     get_cards,
     get_hits,
     get_refunds,
@@ -82,12 +81,6 @@ async def api_card_update(
         raise HTTPException(
             detail="Not your card.", status_code=HTTPStatus.FORBIDDEN
         )
-    checkUid = await get_card_by_uid(data.uid)
-    if checkUid and checkUid.id != card_id:
-        raise HTTPException(
-            detail="UID already registered. Delete registered card and try again.",
-            status_code=HTTPStatus.BAD_REQUEST,
-        )
     card = await update_card(card_id, **data.dict())
     assert card, "update_card should always return a card"
     return card
@@ -102,12 +95,6 @@ async def api_card_create(
     data: CreateCardData,
     wallet: WalletTypeInfo = Depends(require_admin_key),
 ) -> Card:
-    checkUid = await get_card_by_uid(data.uid)
-    if checkUid:
-        raise HTTPException(
-            detail="UID already registered. Delete registered card and try again.",
-            status_code=HTTPStatus.BAD_REQUEST,
-        )
     card = await create_card(wallet_id=wallet.wallet.id, data=data)
     assert card, "create_card should always return a card"
     return card