`database::Hash` cannot be used as a map key

Consider wrapping it in a newtype struct like this:

```rust
#[derive(Deserialize, Eq, Hash, PartialEq, PartialOrd, Ord, Serialize)]
#[serde(transparent)]
pub struct MediaHash(
	#[serde(with = "serde_big_array::BigArray")] pub database::Hash
);
```