message: Set and check the sqlite user version
diff: #include <stdint.h>
  static const char* const DATABASE_FILENAME = "wallet.dat";
  +static constexpr int32_t WALLET_SCHEMA_VERSION = 0;
  static Mutex g_sqlite_mutex;
  static int g_sqlite_count GUARDED_BY(g_sqlite_mutex) = 0;
  @@ -137,6 +138,27 @@ bool SQLiteDatabase::Verify(bilingual_str& error)
  return false;
  }
  + // Check our schema version
  + sqlite3_stmt* user_ver_stmt{nullptr};
  + ret = sqlite3_prepare_v2(m_db, "PRAGMA user_version", -1, &user_ver_stmt, nullptr);
  + if (ret != SQLITE_OK) {
  + sqlite3_finalize(user_ver_stmt);
  + error = strprintf(_("SQLiteDatabase: Failed to prepare the statement to fetch sqlite wallet schema version: %s"), sqlite3_errstr(ret));
  + return false;
  + }
  + ret = sqlite3_step(user_ver_stmt);
  + if (ret != SQLITE_ROW) {
  + sqlite3_finalize(user_ver_stmt);
  + error = strprintf(_("SQLiteDatabase: Failed to fetch sqlite wallet schema version: %s"), sqlite3_errstr(ret));
  + return false;
  + }
  + int32_t user_ver = sqlite3_column_int(user_ver_stmt, 0);
  + sqlite3_finalize(user_ver_stmt);
  + if (user_ver != WALLET_SCHEMA_VERSION) {
  + error = strprintf(_("SQLiteDatabase: Unknown sqlite wallet schema version %d. Only version %d is supported"), user_ver, WALLET_SCHEMA_VERSION);
  + return false;
  + }
  +
  sqlite3_stmt* stmt{nullptr};
  ret = sqlite3_prepare_v2(m_db, "PRAGMA integrity_check", -1, &stmt, nullptr);
  if (ret != SQLITE_OK) {
  @@ -246,6 +268,13 @@ void SQLiteDatabase::Open()
  if (ret != SQLITE_OK) {
  throw std::runtime_error(strprintf("SQLiteDatabase: Failed to set the application id: %s\n", sqlite3_errstr(ret)));
  }
  +
  + // Set the user version
  + std::string set_user_ver = strprintf("PRAGMA user_version = %d", WALLET_SCHEMA_VERSION);
  + ret = sqlite3_exec(m_db, set_user_ver.c_str(), nullptr, nullptr, nullptr);
  + if (ret != SQLITE_OK) {
  + throw std::runtime_error(strprintf("SQLiteDatabase: Failed to set the wallet schema version: %s\n", sqlite3_errstr(ret)));
  + }
  }
  }
  