I’ve decided against using the model from Sycamore, which provided row-level separation of wikis with a wiki_id key. Thus, I removed all those columns and the accompanying code. I left it in for the memcache code, as I’ll probably replace the wiki_id with a domain key, so that there are no collisions in memcache for different wikis which are on different databases. Instead of the wiki_id key, I’ll instead opt for table prefixes. That seems to be a common strategy for hosting multiple instances of data sets within a single database. Works for me with Wordpress and MediaWiki.