Fix indexes

[randomouscrap98]

We need:

• An index on literalType on content
• To consider whether the extra fields past "id" in idx_message_standard do anything, and where they do and don't (each column is a sort, if you sort by id as the second column, the rest are useless because they don't actually do anything)
• Same as above but for createDate in idx_message_standard_date
• Perhaps more indexes to support oldsbs on content, since content will take on a bigger split role compared to here. Need to be able to go through pagination of threads, polls, etc based on create date, but ALSO last post date, which may be more difficult.

[randomouscrap98]

This was completed in 548ca90029c5376501954af7b809a58608626c9c