AWS and GCE currently break Phabcricator (spitting out a warning about sql_mode and possibly errors down the line with 2FA) - basically, most managed SQL services without the "STRICT_ALL_TABLES" flag set in SQL.
It's fine if you run your own SQL, but using managed SQL (especially ones that you have limited access to) break. Thankfully, you can set SQL modes per-session instead of globally. That would mean adding a statement somewhere where we've just set the mode manually. This would make the warnings all but useless, unless somehow setting the session's mode failed.
I created a diff earlier which resides in the libphutil and shows an example of what that patch would look like. This may not be the correct place for it- my assumption is the whole thing should be moved to Phabricator itself somewhere, but I'm not familiar with the codebase enough to say exactly where.