refactor: improve code readability and consistency across multiple files

apps/gateway/src/bin/migrate.rs

@@ -4,7 +4,6 @@
 //! schema for each one. Standalone CLI tool invoked as `cargo run --bin migrate`.
 
 use std::path::Path;
-use tracing;
 
 fn main() -> anyhow::Result<()> {
     let store = zesdex_domain::core::Store::new();

apps/gateway/src/bin/seed.rs

@@ -4,7 +4,6 @@
 //! configuration files plus a seed session for development/testing.
 //! Invoked as `cargo run --bin seed`.
 
-use tracing;
 
 fn main() -> anyhow::Result<()> {
     let store = zesdex_domain::core::Store::new();