feat(nzbdav): two-phase migration — import + symlink rewrite

cmd/altmount/cmd/serve.go

@@ -150,6 +150,7 @@ func runServe(cmd *cobra.Command, args []string) error {
 
 	apiServer := setupAPIServer(app, repos, authService, configManager, metadataReader, metadataService, fs, poolManager, importerService, arrsService, mountService, progressBroadcaster, streamTracker, cacheSource)
 	apiServer.SetLogFilePath(slogutil.GetLogFilePath(cfg.Log))
+	apiServer.SetMigrationRepo(db.MigrationRepo)
 
 	webdavHandler, err := setupWebDAV(cfg, fs, authService, repos.UserRepo, configManager, streamTracker)
 	if err != nil {

frontend/src/api/client.ts

@@ -16,6 +16,8 @@ import type {
 	ImportStatusResponse,
 	LibrarySyncStatus,
 	ManualScanRequest,
+	NzbdavMigrateSymlinksRequest,
+	NzbdavMigrateSymlinksResponse,
 	PoolMetrics,
 	QueueHistoricalStatsResponse,
 	QueueItem,
@@ -86,7 +88,13 @@ export class APIClient {
 				if (response.status === 401) {
 					window.dispatchEvent(new CustomEvent("api:unauthorized"));
 				}
-				const errorData = await response.json();
+				// eslint-disable-next-line @typescript-eslint/no-explicit-any
+				let errorData: any = {};
+				try {
+					errorData = await response.json();
+				} catch {
+					// empty or non-JSON error body — fall through to status-based message
+				}
 				const errorMessage =
 					(typeof errorData.error === "object" ? errorData.error?.message : errorData.error) ||
 					errorData.message ||
@@ -844,6 +852,28 @@ export class APIClient {
 		});
 	}
 
+	async clearPendingNzbdavMigrations() {
+		return this.request<{ message: string; data: { deleted: number } }>(
+			"/import/nzbdav/pending-migrations",
+			{ method: "DELETE" },
+		);
+	}
+
+	async clearAllNzbdavMigrations() {
+		return this.request<{ message: string; data: { deleted: number } }>(
+			"/import/nzbdav/migrations",
+			{ method: "DELETE" },
+		);
+	}
+
+	async migrateNzbdavSymlinks(req: NzbdavMigrateSymlinksRequest) {
+		return this.request<NzbdavMigrateSymlinksResponse>("/import/nzbdav/migrate-symlinks", {
+			method: "POST",
+			headers: { "Content-Type": "application/json" },
+			body: JSON.stringify(req),
+		});
+	}
+
 	// SABnzbd file upload endpoint
 	async uploadNzbFile(file: File, apiKey: string): Promise<SABnzbdAddResponse> {
 		const formData = new FormData();

frontend/src/components/files/FileBrowserModal.tsx

@@ -133,7 +133,8 @@ export function FileBrowserModal({
 						<table className="table-zebra table-sm table">
 							<thead className="sticky top-0 z-10 bg-base-100">
 								<tr>
-									<th /> {/* Icon */}
+									<th />
+									{/* Icon */}
 									<th>Name</th>
 									<th>Size</th>
 									<th>Modified</th>