diff --git a/crates/dkdc-db-core/src/manager.rs b/crates/dkdc-db-core/src/manager.rs
index 869da64..0ce9ae4 100644
--- a/crates/dkdc-db-core/src/manager.rs
+++ b/crates/dkdc-db-core/src/manager.rs
@@ -129,16 +129,17 @@ impl DbManager {
     pub async fn execute(&self, db_name: &str, sql: &str) -> Result<u64> {
         error::validate_sql(sql)?;
         self.ensure_db(db_name).await?;
-        let dbs = self.dbs.read().await;
-        let managed = dbs.get(db_name).ok_or_else(|| db_not_found(db_name))?;
-        let result = managed.db.execute(sql).await?;
+        let (result, catalog, is_ddl) = {
+            let dbs = self.dbs.read().await;
+            let managed = dbs.get(db_name).ok_or_else(|| db_not_found(db_name))?;
+            let result = managed.db.execute(sql).await?;
+            let catalog = managed.catalog.clone();
+            let is_ddl = router::is_ddl(sql);
+            (result, catalog, is_ddl)
+        }; // read lock released here
         // Refresh catalog if DDL (selective: only the affected table)
-        if router::is_ddl(sql) {
-            managed
-                .catalog
-                .schema_provider()
-                .refresh_for_ddl(sql)
-                .await?;
+        if is_ddl {
+            catalog.schema_provider().refresh_for_ddl(sql).await?;
         }
         Ok(result)
     }
diff --git a/crates/dkdc-db-core/src/schema.rs b/crates/dkdc-db-core/src/schema.rs
index 3996c1a..662ee3b 100644
--- a/crates/dkdc-db-core/src/schema.rs
+++ b/crates/dkdc-db-core/src/schema.rs
@@ -81,7 +81,7 @@ pub async fn list_tables(conn: &turso::Connection) -> Result<Vec<String>> {
     let mut tables = Vec::new();
     while let Some(row) = rows.next().await? {
         let name: String = row.get(0)?;
-        tables.push(name);
+        tables.push(name.to_lowercase());
     }
     Ok(tables)
 }