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The following values are considered confidential, and should never be logged, even by accident:
* `Password`, which is a durable bearer token for a specific Login;
* `IdentitySecret`, which is an ephemeral but potentially long-lived bearer token for a specific Login; or
* `IdentityToken`, which may hold cookies containing an `IdentitySecret`.
These values are now wrapped in types whose `Debug` impls output opaque values, so that they can be included in structs that `#[derive(Debug)]` without requiring any additional care. The wrappers also avoid implementing `Display`, to prevent inadvertent `to_string()`s.
We don't bother obfuscating `IdentitySecret`s in memory or in the `.hi` database. There's no point: we'd also need to store the information needed to de-obfuscate them, and they can be freely invalidated and replaced by blanking that table and asking everyone to log in again. Passwords _are_ obfuscated for storage, as they're intended to be durable.
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issued.
This lets us shorten the expiry interval - by quite a bit. Tokens in regular use will now live indefinitely, while tokens that go unused for _one week_ will be invalidated and deleted. This will reduce the number of "dead" tokens (still valid, but _de facto_ no longer in use) stored in the table, and limit the exposure period if a token is leaked and then not used immediately.
It's also much less likely to produce surprise logouts three months after installation. You'll either stay logged in, or have to log in again much, much sooner, making it feel a lot more regular and less surprising.
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