Fix some DB tables to use utf8mb4_general_ci

[db] fix schema and migration for case insensitivity

WARNING This commit modifies the latest alembic migration revision.

Some of the columns that were changed still want to be case insensitive. Good thing our tables have nice separation.

Fully upgraded users should run the following commands:

$ git pull origin $branch_containing_this_commit
$ alembic downgrade -1
$ alembic upgrade head

Signed-off-by: Kevin Morris kevr@0cost.org