The field sketchware_ver apparently is the sketchware app's version code where the project is created.
My guess is that this is used as a some kind of compatibility check whether a sketchware project is made using a newer version, in which some blocks are not supported?
Here is the table that shows sketchware versions based on their version name:
| Version name | sketchware_ver value |
|---|---|
| v3.10 | 150 |
| v3.9.11 | 149 |
For modded sketchware versions, I don't know for sure, but I've checked that sketchware pro v6.4.0 beta 6 contains the version code 150. So I guess they don't change the version code at all?