* feature (db): Add the ability to enable debug output for a connection
* refactor: Use scope.Global instead of "global"
* feature (db/migrations): Add kms audit keys
Add schema changes to support a new DEK for audit crypto operations.
* feature (kms/audit): Add audit key type
All the bits required to define a new DEK concrete type for
operating on audit entries.
* refactor (db): Remove deprecated migration unit tests.
We added a new audit DEK to kms.CreateKeysTx(...). Unfortunately,
unit tests like TestMigrations_UserDimension,
Test_PrimaryAuthMethodChanges and TestMigrations_CredentialDimension
have an indirect dependency on a specific historical set of DEKs via
an indirect call kms.CreateKeysTx. This of course fails because the
new DEK's tables is not a part of pinned migration versions that these
tests depend on.
* Encrypt tokens on the way out and decrypt on the way in
This isn't a security feature related to tokens specifically; it's so
that we can discard cryptographically bad tokens before we ever hit the
DB. This way we can't pass through a DDoS to the database due to
fetching obviously invalid token values.
I'm using base58 to encode the resulting value as there aren't great
base62 options, and allowing base64 / and + values can hamper usability
by creating copying/highlighting breaks.