Sync Without Casualties: A Practical Framework for Bidirectional Conflict Resolution

This is a technical deep dive into handling the most challenging scenarios in bidirectional file synchronization—when the same file is modified, deleted, or moved on both sides. The author shares a production-tested approach using SQLite-based state tracking and configurable resolution strategies that prioritize data safety, which is essential for any app syncing critical user files. Understanding these conflict patterns is vital for developers, as naive implementations without conflict detection can silently lose user data.