test: add backend API contract coverage

src/lib/httpSqlFileProgress.ts

@@ -0,0 +1,19 @@
+import type { SqlFileProgress } from "./tauri";
+
+export function listenSqlFileProgressById(
+  executionId: string,
+  handler: (progress: SqlFileProgress) => void,
+): () => void {
+  const es = new EventSource(`/api/sql-file/progress/${executionId}`);
+  es.onmessage = (e) => {
+    const progress: SqlFileProgress = JSON.parse(e.data);
+    handler(progress);
+    if (progress.status === "done" || progress.status === "error" || progress.status === "cancelled") {
+      es.close();
+    }
+  };
+  es.onerror = () => {
+    es.close();
+  };
+  return () => es.close();
+}