fix: check server ownership for text channel

refactor: minor cleanup of code

crates/core/database/src/util/idempotency.rs

@@ -1,6 +1,6 @@
 use std::num::NonZeroUsize;
 
-use revolt_result::{create_error, Result};
+use revolt_result::{create_error, Result, Error};
 
 use async_std::sync::Mutex;
 use once_cell::sync::Lazy;

crates/core/database/src/util/permissions.rs

@@ -344,6 +344,7 @@ impl PermissionQuery for DatabasePermissionQuery<'_> {
                 | Cow::Owned(Channel::TextChannel { server, .. })
                 | Cow::Borrowed(Channel::VoiceChannel { server, .. })
                 | Cow::Owned(Channel::VoiceChannel { server, .. }) => {
+                    // FIXME: may double fetch
                     if let Ok(server) = self.database.fetch_server(server).await {
                         self.server.replace(Cow::Owned(server));
                     }