Sync means reconciliation: data from Lexware, Clockify, or Timebutler is transferred into the local data set of Central Command. This produces new entries, updates, and markers for removed records. Sync is the freshness function behind every fast dashboard.
When sync runs as a cron job, it takes the load off users. Intervals, gaps between instances, and rate limits determine the duration and the gentleness toward the APIs. Failed runs must be visible, otherwise a false sense of security emerges. Watermarks help you understand up to which point synchronization has progressed.
Without sync, Central Command would be just an empty frame. With sync, it becomes a situation room. The art lies in balancing freshness and stability. Teams steer with fresh data; upstream systems remain sovereign. Sync is thus the operational heart between API and UI.