Long time since I touched this but that number indicates a write error, also your code appears to be concatenating all the update statements before appending all of the parameters,...

Simple answer, yes separate accounts is the best way to go.

Have used GitHub for version control in the past along with Confluence for documentation.

Good question, thanks Evgeny.

A starting point may be to query stored procedures for the existence of sp_executeSQL.

Have you checked for any invalid characters within the source, that may be a start, oh and they may not be obviously discernable, just to make it easy!

Excuse the formatting, it seems the interface likes it like this!!!! But as an alternative, something like this:-

CREATE

Learned something new, thanks Steve.