Fossil

      db_multi_exec("ALTER TABLE undo ADD COLUMN isLink BOOLEAN DEFAULT 0");
    }
    if( db_local_table_exists_but_lacks_column("undo_vfile", "islink") ){
      db_multi_exec("ALTER TABLE undo_vfile ADD COLUMN islink BOOL DEFAULT 0");
    }
  }

  /* The design of the check-out database changed on 2019-01-19 adding the mhash
  ** column to vfile and vmerge and changing the UNIQUE index on vmerge into
  ** a PRIMARY KEY that includes the new mhash column.  However, we must have
  ** the repository database at hand in order to do the migration, so that
  ** step is deferred. */
  return 1;
}

      z = fossil_strdup(pSetting->def);
    }else{
      z = fossil_strdup(zDefault);
    }
  }
  return z;
}
char *db_get_mtime(const char *zName, const char *zFormat,
                   const char *zDefault){
  char *z = 0;
  if( g.repositoryOpen ){
    z = db_text(0, "SELECT mtime FROM config WHERE name=%Q", zName);
  }
  if( z==0 ){
    z = fossil_strdup(zDefault);
  }else if( zFormat!=0 ){