diff --git a/src/Zenith/DB.hs b/src/Zenith/DB.hs
index a48151d..03cc451 100644
--- a/src/Zenith/DB.hs
+++ b/src/Zenith/DB.hs
@@ -77,6 +77,7 @@ import Zenith.Types
   , TransparentSpendingKeyDB
   , UnifiedAddressDB(..)
   , ZcashNetDB(..)
+  , ZcashPool(..)
   )
 
 share
@@ -246,6 +247,15 @@ share
     position Int
     UniqueSSPos tx position
     deriving Show Eq
+  QrCode
+    address WalletAddressId OnDeleteCascade OnUpdateCascade
+    version ZcashPool
+    bytes BS.ByteString
+    height Int
+    width Int
+    name T.Text
+    UniqueQr address version
+    deriving Show Eq
     |]
 
 -- * Database functions
@@ -416,6 +426,16 @@ getWalletAddresses pool w = do
   addrs <- mapM (getAddresses pool . entityKey) accs
   return $ concat addrs
 
+getExternalAddresses :: ConnectionPool -> IO [Entity WalletAddress]
+getExternalAddresses pool = do
+  runNoLoggingT $
+    PS.retryOnBusy $
+    flip PS.runSqlPool pool $ do
+      select $ do
+        addrs <- from $ table @WalletAddress
+        where_ $ addrs ^. WalletAddressScope ==. val (ScopeDB External)
+        return addrs
+
 -- | Returns the largest address index for the given account
 getMaxAddress ::
      ConnectionPool -- ^ The database path
@@ -548,6 +568,41 @@ getZcashTransactions pool b =
       orderBy [asc $ txs ^. ZcashTransactionBlock]
       return txs
 
+-- ** QR codes
+-- | Functions to manage the QR codes stored in the database
+saveQrCode ::
+     ConnectionPool -- ^ the connection pool
+  -> QrCode
+  -> NoLoggingT IO (Maybe (Entity QrCode))
+saveQrCode pool qr =
+  PS.retryOnBusy $ flip PS.runSqlPool pool $ insertUniqueEntity qr
+
+getQrCodes ::
+     ConnectionPool -- ^ the connection pool
+  -> WalletAddressId
+  -> IO [Entity QrCode]
+getQrCodes pool wId =
+  runNoLoggingT $
+  PS.retryOnBusy $
+  flip PS.runSqlPool pool $ do
+    select $ do
+      qrs <- from $ table @QrCode
+      where_ $ qrs ^. QrCodeAddress ==. val wId
+      return qrs
+
+getQrCode :: ConnectionPool -> ZcashPool -> WalletAddressId -> IO (Maybe QrCode)
+getQrCode pool zp wId = do
+  r <-
+    runNoLoggingT $
+    PS.retryOnBusy $
+    flip PS.runSqlPool pool $ do
+      selectOne $ do
+        qrs <- from $ table @QrCode
+        where_ $ qrs ^. QrCodeAddress ==. val wId
+        where_ $ qrs ^. QrCodeVersion ==. val zp
+        return qrs
+  return $ entityVal <$> r
+
 -- * Wallet
 -- | Get the block of the last transaction known to the wallet
 getMaxWalletBlock ::
diff --git a/src/Zenith/Types.hs b/src/Zenith/Types.hs
index 5526aa6..6176c17 100644
--- a/src/Zenith/Types.hs
+++ b/src/Zenith/Types.hs
@@ -143,7 +143,9 @@ data ZcashPool
   | Sprout
   | Sapling
   | Orchard
-  deriving (Show, Eq, Generic, ToJSON)
+  deriving (Show, Read, Eq, Generic, ToJSON)
+
+derivePersistField "ZcashPool"
 
 instance FromJSON ZcashPool where
   parseJSON =