fix: prevent import hanging by adding abort signals and idle timeouts

- Furni batch: wire request.signal to abort controller, send post_import
  progress events, skip post-import steps when aborted
- Clone sync-all: pre-fetch furnidata once per source instead of per item
  (eliminates 2000+ redundant DB reads + HTTP requests)
- SSE client: add 60s idle timeout to prevent infinite hangs when server
  stops responding

src/app/api/admin/import/clone/sync-all/route.ts

@@ -6,6 +6,7 @@ import { logAudit } from "@/lib/services/audit";
 import {
 	cloneSingleFurni,
 	fetchSourceFurnidata,
+	type SourceFurni,
 } from "@/lib/services/clone-import";
 import { listSources } from "@/lib/services/clone-sources";
 import {
@@ -39,6 +40,20 @@ export const POST = withAdmin(
 			);
 		}
 
+		// Pre-fetch furnidata ONCE per source and build a lookup map.
+		// The old code re-fetched inside the worker loop for every item,
+		// causing 2000+ redundant DB reads + HTTP requests.
+		const sourceFurniDataMap = new Map<string, Map<string, SourceFurni>>();
+
+		for (const source of sources) {
+			try {
+				const entries = await fetchSourceFurnidata(source.furnidataUrl);
+				const byClassname = new Map(entries.map((e) => [e.classname, e]));
+				sourceFurniDataMap.set(source.id, byClassname);
+			} catch {}
+		}
+
+		// Collect all missing items using pre-fetched data
 		const allItems: Array<{
 			classname: string;
 			sourceName: string;
@@ -46,14 +61,10 @@ export const POST = withAdmin(
 		}> = [];
 
 		for (const source of sources) {
-			let entries: Awaited<ReturnType<typeof fetchSourceFurnidata>>;
-			try {
-				entries = await fetchSourceFurnidata(source.furnidataUrl);
-			} catch {
-				continue;
-			}
+			const byClassname = sourceFurniDataMap.get(source.id);
+			if (!byClassname) continue;
 
-			const classnames = entries.map((e) => e.classname);
+			const classnames = [...byClassname.keys()];
 			if (classnames.length === 0) continue;
 
 			const rows = await db
@@ -62,10 +73,10 @@ export const POST = withAdmin(
 				.where(inArray(ItemsBase.itemName, classnames));
 			const have = new Set(rows.map((r) => r.item_name));
 
-			for (const entry of entries) {
-				if (!have.has(entry.classname)) {
+			for (const classname of classnames) {
+				if (!have.has(classname)) {
 					allItems.push({
-						classname: entry.classname,
+						classname,
 						sourceName: source.name,
 						sourceId: source.id,
 					});
@@ -106,29 +117,30 @@ export const POST = withAdmin(
 			itemType: string;
 		}> = [];
 
+		// Source lookup cache — pre-fetched above, no need to re-fetch per item
+		const sourceMap = new Map(sources.map((s) => [s.id, s]));
+
 		return runSseBatch({
 			items: allItems,
 			concurrency: 10,
 			signal: request.signal,
 			labelOf: (it) => `${it.sourceName}/${it.classname}`,
 			worker: async (it, _index, report) => {
-				const allSrc = await listSources();
-				const source = allSrc.find((s) => s.id === it.sourceId);
+				const source = sourceMap.get(it.sourceId);
 				if (!source) {
 					return { ok: false, error: "source not found" };
 				}
 
-				let allEntries: Awaited<ReturnType<typeof fetchSourceFurnidata>>;
-				try {
-					allEntries = await fetchSourceFurnidata(source.furnidataUrl);
-				} catch (err) {
+				// Use pre-fetched furnidata instead of re-fetching
+				const byClassname = sourceFurniDataMap.get(it.sourceId);
+				if (!byClassname) {
 					return {
 						ok: false,
-						error: `furnidata fetch failed: ${(err as Error).message}`,
+						error: "furnidata not available for this source",
 					};
 				}
 
-				const entry = allEntries.find((e) => e.classname === it.classname);
+				const entry = byClassname.get(it.classname);
 				if (!entry) {
 					return {
 						ok: false,

src/lib/sse-client.ts

@@ -3,26 +3,46 @@ import { adminFetch } from "@/lib/admin-fetch";
 
 export type SseEvent = Record<string, unknown>;
 
+/** Default idle timeout: if no SSE event arrives for this long, abort. */
+const DEFAULT_IDLE_TIMEOUT_MS = 60_000;
+
 /**
  * Read an SSE response body and invoke `onEvent` for each `data:` JSON payload.
+ * Aborts if no event arrives within `idleTimeoutMs` (default 60s).
  */
 export async function readSseStream(
 	body: ReadableStream<Uint8Array>,
 	onEvent: (event: SseEvent) => void,
 	signal?: AbortSignal,
+	idleTimeoutMs: number = DEFAULT_IDLE_TIMEOUT_MS,
 ): Promise<void> {
 	const reader = body.getReader();
 	const decoder = new TextDecoder();
 	let buf = "";
+	let idleTimer: ReturnType<typeof setTimeout> | undefined;
+	let done = false;
+
+	const resetIdleTimer = () => {
+		if (idleTimer) clearTimeout(idleTimer);
+		if (idleTimeoutMs > 0) {
+			idleTimer = setTimeout(() => {
+				if (!done) {
+					reader.cancel("SSE idle timeout").catch(() => {});
+				}
+			}, idleTimeoutMs);
+		}
+	};
 
 	try {
+		resetIdleTimer();
 		while (true) {
 			if (signal?.aborted) {
 				await reader.cancel();
 				break;
 			}
-			const { value, done } = await reader.read();
-			if (done) break;
+			const { value, done: streamDone } = await reader.read();
+			if (streamDone) break;
+			resetIdleTimer();
 			buf += decoder.decode(value, { stream: true });
 			const parts = buf.split("\n\n");
 			buf = parts.pop() ?? "";
@@ -36,6 +56,8 @@ export async function readSseStream(
 			}
 		}
 	} finally {
+		done = true;
+		if (idleTimer) clearTimeout(idleTimer);
 		reader.releaseLock();
 	}
 }