fix: autobackup influences an exclusive locks made by SQLite

It happens if dash is build with support of both SQLite and BDB

src/wallet/bdb.h

@@ -161,6 +161,8 @@ class BerkeleyDatabase : public WalletDatabase
 
     /** Make a BerkeleyBatch connected to this database */
     std::unique_ptr<DatabaseBatch> MakeBatch(bool flush_on_close = true) override;
+
+    virtual bool SupportsAutoBackup() override { return true; }
 };
 
 /** RAII class that provides access to a Berkeley database */

src/wallet/db.h

@@ -152,6 +152,8 @@ class WalletDatabase
 
     /** Make a DatabaseBatch connected to this database */
     virtual std::unique_ptr<DatabaseBatch> MakeBatch(bool flush_on_close = true) = 0;
+
+    virtual bool SupportsAutoBackup() { return false; }
 };
 
 /** RAII class that provides access to a DummyDatabase. Never fails. */

src/wallet/wallet.cpp

@@ -4502,6 +4502,7 @@ std::shared_ptr<CWallet> CWallet::Create(interfaces::Chain& chain, interfaces::C
     // TODO: Can't use std::make_shared because we need a custom deleter but
     // should be possible to use std::allocate_shared.
     std::shared_ptr<CWallet> walletInstance(new CWallet(&chain, &coinjoin_loader, name, std::move(database)), ReleaseWallet);
+    // TODO: refactor this condition: validation of error looks like workaround
     if (!walletInstance->AutoBackupWallet(walletFile, error, warnings) && !error.original.empty()) {
         return nullptr;
     }
@@ -4942,7 +4943,12 @@ bool CWallet::AutoBackupWallet(const fs::path& wallet_path, bilingual_str& error
     if (strWalletName.empty()) {
         strWalletName = "wallet.dat";
     }
-
+    // This condition is required to be sure that wallet.dat won't be re-opened by IsBDBFile
+    // Re-opening of database file brokes an exclusive inter-process lock for SQLite
+    if (m_database && !m_database->SupportsAutoBackup()) {
+        WalletLogPrintf("Automatic wallet backups are not supported!\n");
+        return false;
+    }
     if (!wallet_path.empty() && !IsBDBFile(BDBDataFile(wallet_path))) {
         WalletLogPrintf("Automatic wallet backups are currently only supported with Berkeley DB!\n");
         return false;