diff --git a/lnbits/extensions/boltcards/migrations.py b/lnbits/extensions/boltcards/migrations.py
index c20ef449..5be3d08f 100644
--- a/lnbits/extensions/boltcards/migrations.py
+++ b/lnbits/extensions/boltcards/migrations.py
@@ -5,10 +5,10 @@ async def m001_initial(db):
     await db.execute(
         """
         CREATE TABLE boltcards.cards (
-            id TEXT PRIMARY KEY,
+            id TEXT PRIMARY KEY UNIQUE,
             wallet TEXT NOT NULL,
             card_name TEXT NOT NULL,
-            uid TEXT NOT NULL,
+            uid TEXT NOT NULL UNIQUE,
             counter INT NOT NULL DEFAULT 0,
             tx_limit TEXT NOT NULL,
             daily_limit TEXT NOT NULL,
@@ -30,7 +30,7 @@ async def m001_initial(db):
     await db.execute(
         """
         CREATE TABLE boltcards.hits (
-            id TEXT PRIMARY KEY,
+            id TEXT PRIMARY KEY UNIQUE,
             card_id TEXT NOT NULL,
             ip TEXT NOT NULL,
             spent BOOL NOT NULL DEFAULT True,
@@ -48,7 +48,7 @@ async def m001_initial(db):
     await db.execute(
         """
         CREATE TABLE boltcards.refunds (
-            id TEXT PRIMARY KEY,
+            id TEXT PRIMARY KEY UNIQUE,
             hit_id TEXT NOT NULL,
             refund_amount INT NOT NULL,
             time TIMESTAMP NOT NULL DEFAULT """
diff --git a/lnbits/extensions/boltcards/templates/boltcards/index.html b/lnbits/extensions/boltcards/templates/boltcards/index.html
index ec2611a9..43901f72 100644
--- a/lnbits/extensions/boltcards/templates/boltcards/index.html
+++ b/lnbits/extensions/boltcards/templates/boltcards/index.html
@@ -12,33 +12,18 @@
                 <h5 class="text-subtitle1 q-my-none">Cards</h5>
               </div>
               <div class="col">
-                <q-btn
-                  round
-                  size="sm"
-                  icon="add"
-                  unelevated
-                  color="primary"
-                  @click="addCardOpen"
-                >
+                <q-btn round size="sm" icon="add" unelevated color="primary" @click="addCardOpen">
                   <q-tooltip>Add card</q-tooltip>
                 </q-btn>
               </div>
             </div>
           </div>
           <div class="col-auto">
-            <q-btn flat color="grey" @click="exportCardsCSV"
-              >Export to CSV</q-btn
-            >
+            <q-btn flat color="grey" @click="exportCardsCSV">Export to CSV</q-btn>
           </div>
         </div>
-        <q-table
-          dense
-          flat
-          :data="cards"
-          row-key="id"
-          :columns="cardsTable.columns"
-          :pagination.sync="cardsTable.pagination"
-        >
+        <q-table dense flat :data="cards" row-key="id" :columns="cardsTable.columns"
+          :pagination.sync="cardsTable.pagination">
           {% raw %}
           <template v-slot:header="props">
             <q-tr :props="props">
@@ -53,13 +38,8 @@
           <template v-slot:body="props">
             <q-tr :props="props">
               <q-td auto-width>
-                <q-btn
-                  unelevated
-                  dense
-                  icon="qr_code"
-                  :color="($q.dark.isActive) ? 'grey-7' : 'grey-5'"
-                  @click="openQrCodeDialog(props.row.id)"
-                >
+                <q-btn unelevated dense icon="qr_code" :color="($q.dark.isActive) ? 'grey-7' : 'grey-5'"
+                  @click="openQrCodeDialog(props.row.id)">
                   <q-tooltip>Card key credentials</q-tooltip>
                 </q-btn>
               </q-td>
@@ -67,45 +47,19 @@
                 {{ col.value }}
               </q-td>
               <q-td auto-width>
-                <q-btn
-                  v-if="props.row.enable"
-                  dense
-                  @click="enableCard(props.row.wallet, props.row.id, false)"
-                  color="pink"
-                  >DISABLE</q-btn
-                >
-                <q-btn
-                  v-else
-                  dense
-                  @click="enableCard(props.row.wallet, props.row.id, true)"
-                  color="green"
-                  >ENABLE
+                <q-btn v-if="props.row.enable" dense @click="enableCard(props.row.wallet, props.row.id, false)"
+                  color="pink">DISABLE</q-btn>
+                <q-btn v-else dense @click="enableCard(props.row.wallet, props.row.id, true)" color="green">ENABLE
                 </q-btn>
               </q-td>
               <q-td auto-width>
-                <q-btn
-                  flat
-                  dense
-                  size="xs"
-                  @click="updateCardDialog(props.row.id)"
-                  icon="edit"
-                  color="light-blue"
-                >
+                <q-btn flat dense size="xs" @click="updateCardDialog(props.row.id)" icon="edit" color="light-blue">
                   <q-tooltip>Edit card</q-tooltip>
                 </q-btn>
               </q-td>
               <q-td auto-width>
-                <q-btn
-                  flat
-                  dense
-                  size="xs"
-                  @click="deleteCard(props.row.id)"
-                  icon="cancel"
-                  color="pink"
-                >
-                  <q-tooltip
-                    >Deleting card will also delete all records</q-tooltip
-                  >
+                <q-btn flat dense size="xs" @click="deleteCard(props.row.id)" icon="cancel" color="pink">
+                  <q-tooltip>Deleting card will also delete all records</q-tooltip>
                 </q-btn>
               </q-td>
             </q-tr>
@@ -121,19 +75,11 @@
             <h5 class="text-subtitle1 q-my-none">Hits</h5>
           </div>
           <div class="col-auto">
-            <q-btn flat color="grey" @click="exportCardsCSV"
-              >Export to CSV</q-btn
-            >
+            <q-btn flat color="grey" @click="exportCardsCSV">Export to CSV</q-btn>
           </div>
         </div>
-        <q-table
-          dense
-          flat
-          :data="hits"
-          row-key="id"
-          :columns="hitsTable.columns"
-          :pagination.sync="hitsTable.pagination"
-        >
+        <q-table dense flat :data="hits" row-key="id" :columns="hitsTable.columns"
+          :pagination.sync="hitsTable.pagination">
           {% raw %}
           <template v-slot:header="props">
             <q-tr :props="props">
@@ -160,19 +106,11 @@
             <h5 class="text-subtitle1 q-my-none">Refunds</h5>
           </div>
           <div class="col-auto">
-            <q-btn flat color="grey" @click="exportRefundsCSV"
-              >Export to CSV</q-btn
-            >
+            <q-btn flat color="grey" @click="exportRefundsCSV">Export to CSV</q-btn>
           </div>
         </div>
-        <q-table
-          dense
-          flat
-          :data="refunds"
-          row-key="id"
-          :columns="refundsTable.columns"
-          :pagination.sync="refundsTable.pagination"
-        >
+        <q-table dense flat :data="refunds" row-key="id" :columns="refundsTable.columns"
+          :pagination.sync="refundsTable.pagination">
           {% raw %}
           <template v-slot:header="props">
             <q-tr :props="props">
@@ -209,148 +147,55 @@
   <q-dialog v-model="cardDialog.show" position="top" @hide="closeFormDialog">
     <q-card class="q-pa-lg q-pt-xl lnbits__dialog-card">
       <q-form @submit="sendFormData" class="q-gutter-md">
-        <q-select
-          filled
-          dense
-          emit-value
-          v-model="cardDialog.data.wallet"
-          :options="g.user.walletOptions"
-          label="Wallet *"
-        >
+        <q-select filled dense emit-value v-model="cardDialog.data.wallet" :options="g.user.walletOptions"
+          label="Wallet *">
         </q-select>
         <div class="row">
           <div class="col">
-            <q-input
-              filled
-              dense
-              emit-value
-              v-model.trim="cardDialog.data.tx_limit"
-              type="number"
-              label="Max transaction (sats)"
-              class="q-pr-sm"
-            ></q-input>
+            <q-input filled dense emit-value v-model.trim="cardDialog.data.tx_limit" type="number"
+              label="Max transaction (sats)" class="q-pr-sm"></q-input>
           </div>
           <div class="col">
-            <q-input
-              filled
-              dense
-              emit-value
-              v-model.trim="cardDialog.data.daily_limit"
-              type="number"
-              label="Daily limit (sats)"
-            ></q-input>
+            <q-input filled dense emit-value v-model.trim="cardDialog.data.daily_limit" type="number"
+              label="Daily limit (sats)"></q-input>
           </div>
         </div>
-        <q-input
-          filled
-          dense
-          emit-value
-          v-model.trim="cardDialog.data.card_name"
-          type="text"
-          label="Card name "
-        >
+        <q-input filled dense emit-value v-model.trim="cardDialog.data.card_name" type="text" label="Card name ">
         </q-input>
         <div class="row">
           <div class="col-10">
-            <q-input
-              filled
-              dense
-              emit-value
-              v-model.trim="cardDialog.data.uid"
-              type="text"
-              label="Card UID "
-            >
-              <q-tooltip
-                >Get from the card you'll use, using an NFC app</q-tooltip
-              >
+            <q-input filled dense emit-value v-model.trim="cardDialog.data.uid" type="text" label="Card UID ">
+              <q-tooltip>Get from the card you'll use, using an NFC app</q-tooltip>
             </q-input>
           </div>
           <div class="col-2 q-pl-sm">
-            <q-btn
-              outline
-              disable
-              color="grey"
-              icon="nfc"
-              :disable="nfcTagReading"
-              @click="readNfcTag()"
-            >
+            <q-btn outline disable color="grey" icon="nfc" :disable="nfcTagReading" @click="readNfcTag()">
               <q-tooltip>Tap card to scan UID</q-tooltip>
             </q-btn>
           </div>
         </div>
 
-        <q-toggle
-          v-model="toggleAdvanced"
-          label="Show advanced options"
-        ></q-toggle>
+        <q-toggle v-model="toggleAdvanced" label="Show advanced options"></q-toggle>
         <div v-show="toggleAdvanced">
-          <q-input
-            filled
-            dense
-            v-model.trim="cardDialog.data.k0"
-            type="text"
-            label="Card Auth key (K0)"
-            hint="Used to authentificate with the card (16 bytes in HEX). "
-            @randomkey
-          >
+          <q-input filled dense v-model.trim="cardDialog.data.k0" type="text" label="Card Auth key (K0)"
+            hint="Used to authentificate with the card (16 bytes in HEX). " @randomkey>
           </q-input>
-          <q-input
-            filled
-            dense
-            v-model.trim="cardDialog.data.k1"
-            type="text"
-            label="Card Meta key (K1)"
-            hint="Used for encypting of the message (16 bytes in HEX)."
-          ></q-input>
-          <q-input
-            filled
-            dense
-            v-model.trim="cardDialog.data.k2"
-            type="text"
-            label="Card File key (K2)"
-            hint="Used for CMAC of the message (16 bytes in HEX)."
-          >
+          <q-input filled dense v-model.trim="cardDialog.data.k1" type="text" label="Card Meta key (K1)"
+            hint="Used for encypting of the message (16 bytes in HEX)."></q-input>
+          <q-input filled dense v-model.trim="cardDialog.data.k2" type="text" label="Card File key (K2)"
+            hint="Used for CMAC of the message (16 bytes in HEX).">
           </q-input>
-          <q-input
-            filled
-            dense
-            v-model.number="cardDialog.data.counter"
-            type="number"
-            label="Initial counter"
-          >
-            <q-tooltip class="bg-grey-8" anchor="bottom left" self="top left"
-              >Zero if you don't know.</q-tooltip
-            >
+          <q-input filled dense v-model.number="cardDialog.data.counter" type="number" label="Initial counter">
+            <q-tooltip class="bg-grey-8" anchor="bottom left" self="top left">Zero if you don't know.</q-tooltip>
           </q-input>
-          <q-btn
-            unelevated
-            color="primary"
-            class="q-ml-auto"
-            v-on:click="generateKeys"
-            v-on:click.right="debugKeys"
-            v-el:keybtn
-            >Generate keys</q-btn
-          >
+          <q-btn unelevated color="primary" class="q-ml-auto" v-on:click="generateKeys" v-on:click.right="debugKeys"
+            v-el:keybtn>Generate keys</q-btn>
         </div>
         <div class="row q-mt-lg">
-          <q-btn
-            v-if="cardDialog.data.id"
-            unelevated
-            color="primary"
-            type="submit"
-            >Update Card</q-btn
-          >
-          <q-btn
-            v-else
-            unelevated
-            color="primary"
-            :disable="cardDialog.data.uid == null"
-            type="submit"
-            >Create Card
+          <q-btn v-if="cardDialog.data.id" unelevated color="primary" type="submit">Update Card</q-btn>
+          <q-btn v-else unelevated color="primary" :disable="cardDialog.data.uid == null" type="submit">Create Card
           </q-btn>
-          <q-btn v-close-popup flat color="grey" class="q-ml-auto"
-            >Cancel</q-btn
-          >
+          <q-btn v-close-popup flat color="grey" class="q-ml-auto">Cancel</q-btn>
         </div>
       </q-form>
     </q-card>
@@ -360,11 +205,7 @@
     <q-card v-if="qrCodeDialog.data" class="q-pa-lg lnbits__dialog-card">
       {% raw %}
       <q-responsive :ratio="1" class="q-mx-xl q-mb-md">
-        <qrcode
-          :value="qrCodeDialog.data.link"
-          :options="{width: 800}"
-          class="rounded-borders"
-        ></qrcode>
+        <qrcode :value="qrCodeDialog.data.link" :options="{width: 800}" class="rounded-borders"></qrcode>
       </q-responsive>
       <p style="word-break: break-all" class="text-center">
         (Keys for bolt-nfc-android-app)
@@ -375,27 +216,14 @@
         <strong>Lock key:</strong> {{ qrCodeDialog.data.k0 }}<br />
         <strong>Meta key:</strong> {{ qrCodeDialog.data.k1 }}<br />
         <strong>File key:</strong> {{ qrCodeDialog.data.k2 }}<br />
-      </p>
-      <br />
-
-      <q-btn
-        unelevated
-        outline
-        color="grey"
-        @click="copyText(lnurlLink + qrCodeDialog.data.uid)"
-        label="Base url (LNURL://)"
-      >
-      </q-btn>
-      <q-btn
-        unelevated
-        outline
-        color="grey"
-        @click="copyText(qrCodeDialog.data.link)"
-        label="Keys/Auth link"
-      >
+      </p><br />
+  
+        <q-btn unelevated outline color="grey" @click="copyText(lnurlLink + qrCodeDialog.data.uid)" label="Base url (LNURL://)">
+        </q-btn>
+      <q-btn unelevated outline color="grey" @click="copyText(qrCodeDialog.data.link)" label="Keys/Auth link">
       </q-btn>
       <q-tooltip>Click to copy, then add to NFC card</q-tooltip>
-
+   
       {% endraw %}
       <div class="row q-mt-lg q-gutter-sm">
         <q-btn v-close-popup flat color="grey" class="q-ml-auto">Close</q-btn>
@@ -406,4 +234,4 @@
 
 {% endblock %} {% block scripts %} {{ window_vars(user) }}
 <script src="/boltcards/static/js/index.js"></script>
-{% endblock %}
+{% endblock %}
\ No newline at end of file
diff --git a/lnbits/extensions/boltcards/views_api.py b/lnbits/extensions/boltcards/views_api.py
index f1e02810..358dd0b4 100644
--- a/lnbits/extensions/boltcards/views_api.py
+++ b/lnbits/extensions/boltcards/views_api.py
@@ -74,7 +74,11 @@ async def api_card_create_or_update(
         raise HTTPException(
             detail="Invalid byte data provided.", status_code=HTTPStatus.BAD_REQUEST
         )
-
+    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
+        )
     if card_id:
         card = await get_card(card_id)
         if not card: