When you move or otherwise rename files in a versioned Syncthing folder, they get copied to .stversions. That's because Syncthing sees renames as separate delete and create operations.

syncthing-dedupe is a quick and dirty script for purging .stversions of all files that actually still exist in the Syncthing folder.

$ ./syncthing-dedupe /path/to/sync/folder

You will be asked for confirmation before deleting files.

File equivalence is based on byte size and SHA-256 checksum.

If the checksum of an .stversions file equals those of multiple "living" files, it's impossible to determine which (if any) of the living files is the true original. In that case, the .stversions file will be spared.

Files with size 0 are also spared.