improve logging for invalid namespaces

Author: MarinPostma

libsql-server/src/http/user/mod.rs

@@ -558,6 +558,7 @@ async fn handle_get_migrations(
             .await?;
         let config = (*store.get()).clone();
         if !config.is_shared_schema {
+            tracing::warn!("invalid namespace: target is not a shared schema");
             return Err(Error::InvalidNamespace);
         }
     }
@@ -584,6 +585,7 @@ async fn handle_get_migration_details(
             .await?;
         let config = (*store.get()).clone();
         if !config.is_shared_schema {
+            tracing::warn!("invalid namespace: target is not a shared schema");
             return Err(Error::InvalidNamespace);
         }
     }

libsql-server/src/namespace/name.rs

@@ -46,6 +46,7 @@ impl NamespaceName {
 
     fn validate(s: &str) -> crate::Result<()> {
         if s.is_empty() {
+            tracing::warn!("invalid namespace: empty namespace");
             return Err(crate::error::Error::InvalidNamespace);
         }