error: casting to the same type is unnecessary (`u32` -> `u32`)
   --> crates/valv/src/lib.rs:235:45
    |
235 |         encrypted_result.extend_from_slice(&(key_version.version as u32).to_be_bytes());
    |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `key_version.version`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
    = note: `-D clippy::unnecessary-cast` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::unnecessary_cast)]`

error: methods `get_key_versions` and `update_key_version` are never used
  --> crates/valv/src/storage/interface.rs:16:14
   |
6  | pub trait ValvStorage {
   |           ----------- methods in this trait
...
16 |     async fn get_key_versions(
   |              ^^^^^^^^^^^^^^^^
...
27 |     async fn update_key_version(
   |              ^^^^^^^^^^^^^^^^^^
   |
   = note: `-D dead-code` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(dead_code)]`

error: unused variable: `version`
   --> crates/valv/src/storage/fdb.rs:258:9
    |
258 |         version: internal::KeyVersion,
    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_version`

error: unused variable: `version_id`
   --> crates/valv/src/storage/fdb.rs:257:9
    |
257 |         version_id: u32,
    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_version_id`

error: unused variable: `key_id`
   --> crates/valv/src/storage/fdb.rs:256:9
    |
256 |         key_id: &str,
    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_id`