diff --git a/src/serialize.h b/src/serialize.h
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -709,6 +709,14 @@
 template <typename Stream, typename C>
 void Unserialize(Stream &is, std::basic_string<C> &str);
 
+/**
+ * string_view
+ */
+template <typename Stream, typename C>
+void Serialize(Stream &os, const std::basic_string_view<C> &str);
+template <typename Stream, typename C>
+void Unserialize(Stream &is, std::basic_string_view<C> &str);
+
 /**
  * prevector
  * prevectors of uint8_t are a special case and are intended to be serialized as
@@ -821,6 +829,26 @@
     }
 }
 
+/**
+ * string_view
+ */
+template <typename Stream, typename C>
+void Serialize(Stream &os, const std::basic_string_view<C> &str) {
+    WriteCompactSize(os, str.size());
+    if (!str.empty()) {
+        os.write((char *)str.data(), str.size() * sizeof(C));
+    }
+}
+
+template <typename Stream, typename C>
+void Unserialize(Stream &is, std::basic_string_view<C> &str) {
+    size_t nSize = ReadCompactSize(is);
+    str.resize(nSize);
+    if (nSize != 0) {
+        is.read((char *)str.data(), nSize * sizeof(C));
+    }
+}
+
 /**
  * prevector
  */
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -56,35 +56,35 @@
 };
 
 namespace DBKeys {
-extern const std::string ACENTRY;
-extern const std::string ACTIVEEXTERNALSPK;
-extern const std::string ACTIVEINTERNALSPK;
-extern const std::string BESTBLOCK;
-extern const std::string BESTBLOCK_NOMERKLE;
-extern const std::string CRYPTED_KEY;
-extern const std::string CSCRIPT;
-extern const std::string DEFAULTKEY;
-extern const std::string DESTDATA;
-extern const std::string FLAGS;
-extern const std::string HDCHAIN;
-extern const std::string KEY;
-extern const std::string KEYMETA;
-extern const std::string MASTER_KEY;
-extern const std::string MINVERSION;
-extern const std::string NAME;
-extern const std::string OLD_KEY;
-extern const std::string ORDERPOSNEXT;
-extern const std::string POOL;
-extern const std::string PURPOSE;
-extern const std::string SETTINGS;
-extern const std::string TX;
-extern const std::string VERSION;
-extern const std::string WALLETDESCRIPTOR;
-extern const std::string WALLETDESCRIPTORCACHE;
-extern const std::string WALLETDESCRIPTORCKEY;
-extern const std::string WALLETDESCRIPTORKEY;
-extern const std::string WATCHMETA;
-extern const std::string WATCHS;
+constexpr std::string_view ACENTRY = "acentry";
+constexpr std::string_view ACTIVEEXTERNALSPK = "activeexternalspk";
+constexpr std::string_view ACTIVEINTERNALSPK = "activeinternalspk";
+constexpr std::string_view BESTBLOCK_NOMERKLE = "bestblock_nomerkle";
+constexpr std::string_view BESTBLOCK = "bestblock";
+constexpr std::string_view CRYPTED_KEY = "ckey";
+constexpr std::string_view CSCRIPT = "cscript";
+constexpr std::string_view DEFAULTKEY = "defaultkey";
+constexpr std::string_view DESTDATA = "destdata";
+constexpr std::string_view FLAGS = "flags";
+constexpr std::string_view HDCHAIN = "hdchain";
+constexpr std::string_view KEYMETA = "keymeta";
+constexpr std::string_view KEY = "key";
+constexpr std::string_view MASTER_KEY = "mkey";
+constexpr std::string_view MINVERSION = "minversion";
+constexpr std::string_view NAME = "name";
+constexpr std::string_view OLD_KEY = "wkey";
+constexpr std::string_view ORDERPOSNEXT = "orderposnext";
+constexpr std::string_view POOL = "pool";
+constexpr std::string_view PURPOSE = "purpose";
+constexpr std::string_view SETTINGS = "settings";
+constexpr std::string_view TX = "tx";
+constexpr std::string_view VERSION = "version";
+constexpr std::string_view WALLETDESCRIPTOR = "walletdescriptor";
+constexpr std::string_view WALLETDESCRIPTORCACHE = "walletdescriptorcache";
+constexpr std::string_view WALLETDESCRIPTORCKEY = "walletdescriptorckey";
+constexpr std::string_view WALLETDESCRIPTORKEY = "walletdescriptorkey";
+constexpr std::string_view WATCHMETA = "watchmeta";
+constexpr std::string_view WATCHS = "watchs";
 } // namespace DBKeys
 
 /* simple HD chain data model */
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -18,38 +18,6 @@
 
 #include <atomic>
 
-namespace DBKeys {
-const std::string ACENTRY{"acentry"};
-const std::string ACTIVEEXTERNALSPK{"activeexternalspk"};
-const std::string ACTIVEINTERNALSPK{"activeinternalspk"};
-const std::string BESTBLOCK_NOMERKLE{"bestblock_nomerkle"};
-const std::string BESTBLOCK{"bestblock"};
-const std::string CRYPTED_KEY{"ckey"};
-const std::string CSCRIPT{"cscript"};
-const std::string DEFAULTKEY{"defaultkey"};
-const std::string DESTDATA{"destdata"};
-const std::string FLAGS{"flags"};
-const std::string HDCHAIN{"hdchain"};
-const std::string KEYMETA{"keymeta"};
-const std::string KEY{"key"};
-const std::string MASTER_KEY{"mkey"};
-const std::string MINVERSION{"minversion"};
-const std::string NAME{"name"};
-const std::string OLD_KEY{"wkey"};
-const std::string ORDERPOSNEXT{"orderposnext"};
-const std::string POOL{"pool"};
-const std::string PURPOSE{"purpose"};
-const std::string SETTINGS{"settings"};
-const std::string TX{"tx"};
-const std::string VERSION{"version"};
-const std::string WALLETDESCRIPTOR{"walletdescriptor"};
-const std::string WALLETDESCRIPTORCACHE{"walletdescriptorcache"};
-const std::string WALLETDESCRIPTORCKEY{"walletdescriptorckey"};
-const std::string WALLETDESCRIPTORKEY{"walletdescriptorkey"};
-const std::string WATCHMETA{"watchmeta"};
-const std::string WATCHS{"watchs"};
-} // namespace DBKeys
-
 //
 // WalletBatch
 //
@@ -200,7 +168,7 @@
 
 bool WalletBatch::WriteActiveScriptPubKeyMan(uint8_t type, const uint256 &id,
                                              bool internal) {
-    std::string key =
+    const auto key =
         internal ? DBKeys::ACTIVEINTERNALSPK : DBKeys::ACTIVEEXTERNALSPK;
     return WriteIC(make_pair(key, type), id);
 }