The latest Rust nightly compiler (2025-08-27) introduced the
elided-named-lifetimes lint which causes Clippy CI checks to fail
when an elided lifetime ('_) resolves to a named lifetime that's
already in scope.
This commit fixes the Clippy warnings by:
- Making lifetime relationships explicit where 'a is already in scope
- Keeping elided lifetimes ('_) in functions without explicit
lifetime parameters
- Ensuring proper lifetime handling in the database pool module
Affected files (17 total):
- Database map modules: Handle, Key, and KeyVal references in get,
qry, keys, and stream operations
- Database pool module: into_recv_seek function
This change resolves the CI build failures without changing any
functionality, ensuring the codebase remains compatible with the
latest nightly Clippy checks.