When the gcd updates its schema (e.g. adds columns), changes have to be made to CreditUpdater, gcd_server, and ComicCollector (first 2 definite, last possibly).
CreditUpdater had to deal with this with the isSourced and sourcedBy columns in GcdStoryCredit. It removes them as part of both DBInitialize and DBMigrate.
When the gcd updates its schema (e.g. adds columns), changes have to be made to CreditUpdater, gcd_server, and ComicCollector (first 2 definite, last possibly).