This issue is hopefully (at last) resolved now. After several relatively small failures over the week, one of the more important database tables finally gave out completely. We had to restore from backup over night to approximately 9/5 10 pm. My apologies to anyone who posted anything of value between 10 pm and 1 am. This data will likely not be recovered as the database was in a poor state at the time, and further recovery would compromise the restored data.
If anyone notices further errors or has concerns, please private message me.