What would happen if I delete it?
Should I put it under version control?
The .sconsign.dblite file is a temporary database used by SCons to keep file signatures to speed up future builds. If you delete it, SCons will recreate it (and your next build might take slightly longer because of that). It should not be put under version control.
来源：https://stackoverflow.com/questions/12867783/what-is-the-file-sconsign-dblite-for