public async Task <List <Watcher> > UpdateWatchers(List <Watcher> defaultWatchers)
{
// Start watch
var stopwatch = new Stopwatch();
stopwatch.Start();
// Get all watchers
var watchers = await _mainDbContext.Watchers.Where(WatcherExpression.NonDefaultWatcher()).ToListAsync();
// Sync watchers
watchers.SyncWatchers(defaultWatchers);
// Update
_mainDbContext.Watchers.UpdateRange(watchers);
// Save
await _mainDbContext.SaveChangesAsync();
// Stop watch
stopwatch.Stop();
// Log
_logger.LogInformation("{@Event}, {@Count}, {@ExecutionTime}", "WatchersUpdated", watchers.Count, stopwatch.Elapsed.TotalSeconds);
// Return
return(watchers);
}