Be stricter in demo mode with respect to schema alterations/deletions.

crates/core/src/admin/table/alter_index.rs

@@ -29,7 +29,7 @@ pub async fn alter_index_handler(
   State(state): State<AppState>,
   Json(request): Json<AlterIndexRequest>,
 ) -> Result<Json<AlterIndexResponse>, Error> {
-  if state.demo_mode() && request.source_schema.name.name.starts_with("_") {
+  if state.demo_mode() {
     return Err(Error::Precondition("Disallowed in demo".into()));
   }
 

crates/core/src/admin/table/alter_table.rs

@@ -42,7 +42,7 @@ pub async fn alter_table_handler(
   State(state): State<AppState>,
   Json(request): Json<AlterTableRequest>,
 ) -> Result<Json<AlterTableResponse>, Error> {
-  if state.demo_mode() && request.source_schema.name.name.starts_with("_") {
+  if state.demo_mode() {
     return Err(Error::Precondition("Disallowed in demo".into()));
   }
 

crates/core/src/admin/table/drop_index.rs

@@ -26,7 +26,7 @@ pub async fn drop_index_handler(
   Json(request): Json<DropIndexRequest>,
 ) -> Result<Json<DropIndexResponse>, Error> {
   let index_name = QualifiedName::parse(&request.name)?;
-  if state.demo_mode() && index_name.name.starts_with("_") {
+  if state.demo_mode() {
     return Err(Error::Precondition("Disallowed in demo".into()));
   }
 

crates/core/src/admin/table/drop_table.rs

@@ -28,7 +28,7 @@ pub async fn drop_table_handler(
   Json(request): Json<DropTableRequest>,
 ) -> Result<Json<DropTableResponse>, Error> {
   let unqualified_table_name = request.name.to_string();
-  if state.demo_mode() && unqualified_table_name.starts_with("_") {
+  if state.demo_mode() {
     return Err(Error::Precondition("Disallowed in demo".into()));
   }