wallet: enable SQLite extended result codes

With this change, we get more fine-grained error messages if something
goes wrong in the course of communicating with the SQLite database. To
pick some random examples, the error codes SQLITE_IOERR_NOMEM,
SQLITE_IOERR_CORRUPTFS or SQLITE_IOERR_FSYNC are way more specific than just a
plain SQLITE_IOERR, and the corresponding error messages generated by
sqlite3_errstr() will hence give a better hint to the user (or also to the
developers, if an error report is sent) what the cause for a failure is.

Author: theStack

src/wallet/sqlite.cpp

@@ -212,6 +212,10 @@ void SQLiteDatabase::Open()
         if (ret != SQLITE_OK) {
             throw std::runtime_error(strprintf("SQLiteDatabase: Failed to open database: %s\n", sqlite3_errstr(ret)));
         }
+        ret = sqlite3_extended_result_codes(m_db, 1);
+        if (ret != SQLITE_OK) {
+            throw std::runtime_error(strprintf("SQLiteDatabase: Failed to enable extended result codes: %s\n", sqlite3_errstr(ret)));
+        }
     }
 
     if (sqlite3_db_readonly(m_db, "main") != 0) {