feat: add listing logger channels in a guild

This commit also allows in the database to hold more than one channel
per guild and introduces clippy linting.

Closes #2

BREAKING CHANGES: The database schema changed from its root. All
databases should be dropped and recreated before running this new
version.

src/db/mod.rs

@@ -1,7 +1,10 @@
+#![allow(clippy::cast_possible_wrap, clippy::cast_sign_loss)]
+
 use std::env;
 
 use poise::serenity_prelude::{ChannelId, GuildId};
 use sqlx::SqlitePool;
+use tracing::error;
 
 pub type Result<T> = ::std::result::Result<T, sqlx::Error>;
 
@@ -22,9 +25,9 @@ impl Database {
 
     pub async fn get_logging_channel(
         &self,
-        guild_id: u64,
+        guild_id: GuildId,
     ) -> Result<Vec<u64>> {
-        let guild_id = guild_id as i64;
+        let guild_id = guild_id.0 as i64;
         let channels = sqlx::query!(
             r#"
 SELECT channel_id
@@ -34,7 +37,11 @@ WHERE guild_id = ?1
             guild_id
         )
         .fetch_all(&self.pool)
-        .await?;
+        .await
+        .map_err(|e| {
+            error!("Error getting logging channels for guild {guild_id}: {e:?}");
+            e
+        })?;
         Ok(channels.iter().map(|id| id.channel_id as u64).collect())
     }
 
@@ -57,6 +64,10 @@ VALUES ( ?1, ?2 )
         )
         .execute(&mut *conn)
         .await
+        .map_err(|e| {
+            error!("Error setting channel {channel_id} as logger for guild {guild_id}: {e:?}");
+            e
+        })
         .map(|_| ())
     }
 }