Persist configuration with rusqlite

Cargo.toml

@@ -11,5 +11,6 @@ eyre = "0.6.12"
 futures = "0.3.31"
 poise = "0.6.1"
 rand = "0.8.5"
+rusqlite = { version = "0.32.1", features = ["rusqlite-macros"] }
 serenity = "0.12.2"
 tokio = { version = "1.41.0", features = ["rt", "net"] }