fix: refactor audit to SSE streaming, improve error handling

- Changed from blocking JSON endpoint to SSE streaming (like sync-all/repair-icons)
- Progress updates during each audit phase with item counts
- Proper error handling with typed AuditEvent for every failure path
- AbortController support for the client
- Shows real-time progress for each check section

src/app/admin/import/audit/audit-client.tsx

@@ -8,7 +8,7 @@ import {
 	Loader2,
 	SearchX,
 } from "lucide-react";
-import { useCallback, useState } from "react";
+import { useCallback, useRef, useState } from "react";
 import { toast } from "sonner";
 import { Button } from "@/components/ui/button";
 import { adminFetch } from "@/lib/admin-fetch";
@@ -30,26 +30,27 @@ interface MissingFromSource {
 	itemName: string;
 }
 
-interface AuditResult {
-	issues: AuditIssue[];
-	missingFromSources: MissingFromSource[];
-	summary: {
-		totalItemsBase: number;
-		totalCatalogItems: number;
-		missingCatalog: number;
-		orphanedCatalog: number;
-		missingNitro: number;
-		missingIcon: number;
-		duplicates: number;
-		missingFromSourcesTotal: number;
-	};
+interface AuditSummary {
+	totalItemsBase: number;
+	totalCatalogItems: number;
+	missingCatalog: number;
+	orphanedCatalog: number;
+	missingNitro: number;
+	missingIcon: number;
+	duplicates: number;
+	missingFromSourcesTotal: number;
 }
 
-const ICON_COLORS: Record<string, string> = {
-	error: "text-[var(--admin-error)]",
-	warning: "text-[var(--admin-warning)]",
-	info: "text-[var(--admin-text-muted)]",
-};
+interface AuditEvent {
+	type: string;
+	message?: string;
+	current?: number;
+	total?: number;
+	section?: string;
+	issues?: AuditIssue[];
+	missingFromSources?: MissingFromSource[];
+	summary?: AuditSummary;
+}
 
 const TYPE_LABELS: Record<string, string> = {
 	missing_catalog: "No catalog entry",
@@ -58,53 +59,137 @@ const TYPE_LABELS: Record<string, string> = {
 	missing_icon: "Missing icon file",
 	duplicate_classname: "Duplicate classname",
 	source_fetch_failed: "Source fetch failed",
-	sources_list_failed: "Sources list failed",
 };
 
 export function AuditClient() {
 	const [loading, setLoading] = useState(false);
-	const [result, setResult] = useState<AuditResult | null>(null);
 	const [progress, setProgress] = useState("");
 	const [activeTab, setActiveTab] = useState<"issues" | "sources">("issues");
 
+	const [issues, setIssues] = useState<AuditIssue[]>([]);
+	const [missingFromSources, setMissingFromSources] = useState<
+		MissingFromSource[]
+	>([]);
+	const [summary, setSummary] = useState<AuditSummary | null>(null);
+
+	const [checkProgress, setCheckProgress] = useState<{
+		section: string;
+		current: number;
+		total: number;
+	} | null>(null);
+
+	const abortRef = useRef<AbortController | null>(null);
+
 	const runAudit = useCallback(async () => {
 		setLoading(true);
-		setResult(null);
 		setProgress("Starting audit…");
+		setIssues([]);
+		setMissingFromSources([]);
+		setSummary(null);
+		setCheckProgress(null);
+		setActiveTab("issues");
+
+		const abort = new AbortController();
+		abortRef.current = abort;
 
 		try {
 			const res = await adminFetch("/api/admin/import/audit", {
 				method: "POST",
-				headers: { "Content-Type": "application/json" },
-				body: JSON.stringify({}),
+				signal: abort.signal,
 			});
 
-			if (!res.ok) {
-				const data = await res.json().catch(() => ({}));
-				toast.error(data.error || "Audit failed");
-				setProgress("");
+			if (!res.body) {
+				toast.error("No response stream");
 				setLoading(false);
 				return;
 			}
 
-			const data = await res.json();
-			setResult(data);
-			toast.success("Audit complete");
-		} catch {
-			toast.error("Audit request failed");
+			const reader = res.body.getReader();
+			const decoder = new TextDecoder();
+			let buf = "";
+
+			while (true) {
+				const { value, done } = await reader.read();
+				if (done) break;
+				buf += decoder.decode(value, { stream: true });
+				const parts = buf.split("\n\n");
+				buf = parts.pop() ?? "";
+				for (const part of parts) {
+					if (!part.startsWith("data: ")) continue;
+					try {
+						const evt = JSON.parse(part.slice(6)) as AuditEvent;
+
+						if (evt.type === "progress") {
+							setProgress(evt.message ?? "");
+						}
+
+						if (evt.type === "items_loaded") {
+							setProgress(`Loaded ${evt.total} items_base entries`);
+						}
+
+						if (evt.type === "catalog_loaded") {
+							setProgress(`Loaded ${evt.total} catalog_items entries`);
+						}
+
+						if (evt.type === "checking") {
+							setProgress(`Checking ${evt.section}…`);
+							if (evt.total) {
+								setCheckProgress({
+									section: evt.section ?? "",
+									current: evt.current ?? 0,
+									total: evt.total,
+								});
+							}
+						}
+
+						if (evt.type === "batch_complete") {
+							setIssues(evt.issues ?? []);
+							setMissingFromSources(evt.missingFromSources ?? []);
+							if (evt.summary) setSummary(evt.summary);
+							setCheckProgress(null);
+							setProgress("Done");
+							if (
+								evt.issues &&
+								evt.issues.filter((i) => i.severity === "error").length > 0
+							) {
+								toast.error(
+									`${evt.issues.filter((i) => i.severity === "error").length} error(s) found`,
+								);
+							} else if (
+								evt.issues &&
+								evt.issues.filter((i) => i.severity === "warning").length > 0
+							) {
+								toast.warning("Warnings found");
+							} else {
+								toast.success("No issues found");
+							}
+						}
+
+						if (evt.type === "error") {
+							setProgress(`ERROR: ${evt.message ?? ""}`);
+							toast.error(evt.message ?? "Audit failed");
+						}
+					} catch {
+						// skip parse errors
+					}
+				}
+			}
+		} catch (err) {
+			if ((err as Error).name !== "AbortError") {
+				toast.error("Audit request failed");
+			}
 		} finally {
 			setLoading(false);
-			setProgress("");
+			abortRef.current = null;
 		}
 	}, []);
 
-	const hasIssues = result && result.issues.length > 0;
-	const errors = result?.issues.filter((i) => i.severity === "error") ?? [];
-	const warnings = result?.issues.filter((i) => i.severity === "warning") ?? [];
+	const errors = issues.filter((i) => i.severity === "error");
+	const warnings = issues.filter((i) => i.severity === "warning");
 
 	return (
 		<div className="space-y-6">
-			{!result && (
+			{!summary && (
 				<Button onClick={runAudit} disabled={loading} size="lg">
 					{loading ? (
 						<Loader2 className="w-4 h-4 animate-spin mr-2" />
@@ -115,21 +200,26 @@ export function AuditClient() {
 				</Button>
 			)}
 
-			{result && (
+			{loading && checkProgress && (
+				<div className="text-sm text-muted-foreground">
+					{checkProgress.section}: {checkProgress.current} /{" "}
+					{checkProgress.total}
+				</div>
+			)}
+
+			{summary && (
 				<>
 					{/* Summary cards */}
 					<div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-4">
 						<div className="rounded-xl border bg-card p-4 space-y-1">
-							<div className="text-2xl font-bold">
-								{result.summary.totalItemsBase}
-							</div>
+							<div className="text-2xl font-bold">{summary.totalItemsBase}</div>
 							<div className="text-xs text-muted-foreground">
 								items_base entries
 							</div>
 						</div>
 						<div className="rounded-xl border bg-card p-4 space-y-1">
 							<div className="text-2xl font-bold">
-								{result.summary.totalCatalogItems}
+								{summary.totalCatalogItems}
 							</div>
 							<div className="text-xs text-muted-foreground">
 								catalog_items entries
@@ -160,64 +250,60 @@ export function AuditClient() {
 					{/* Quick stats */}
 					<div className="grid gap-2 sm:grid-cols-3 text-sm">
 						<div className="flex items-center gap-2">
-							{result.summary.missingCatalog > 0 ? (
+							{summary.missingCatalog > 0 ? (
+								<AlertCircle className="w-4 h-4 text-[var(--admin-warning)]" />
+							) : (
+								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
+							)}
+							<span>{summary.missingCatalog} items without catalog entry</span>
+						</div>
+						<div className="flex items-center gap-2">
+							{summary.orphanedCatalog > 0 ? (
+								<AlertCircle className="w-4 h-4 text-[var(--admin-error)]" />
+							) : (
+								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
+							)}
+							<span>{summary.orphanedCatalog} orphaned catalog references</span>
+						</div>
+						<div className="flex items-center gap-2">
+							{summary.missingNitro > 0 ? (
+								<AlertCircle className="w-4 h-4 text-[var(--admin-error)]" />
+							) : (
+								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
+							)}
+							<span>{summary.missingNitro} items without .nitro</span>
+						</div>
+						<div className="flex items-center gap-2">
+							{summary.missingIcon > 0 ? (
+								<AlertCircle className="w-4 h-4 text-[var(--admin-warning)]" />
+							) : (
+								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
+							)}
+							<span>{summary.missingIcon} items without icon</span>
+						</div>
+						<div className="flex items-center gap-2">
+							{summary.duplicates > 0 ? (
+								<AlertCircle className="w-4 h-4 text-[var(--admin-error)]" />
+							) : (
+								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
+							)}
+							<span>{summary.duplicates} duplicate classnames</span>
+						</div>
+						<div className="flex items-center gap-2">
+							{summary.missingFromSourcesTotal > 0 ? (
 								<AlertCircle className="w-4 h-4 text-[var(--admin-warning)]" />
 							) : (
 								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
 							)}
 							<span>
-								{result.summary.missingCatalog} items without catalog entry
-							</span>
-						</div>
-						<div className="flex items-center gap-2">
-							{result.summary.orphanedCatalog > 0 ? (
-								<AlertCircle className="w-4 h-4 text-[var(--admin-error)]" />
-							) : (
-								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
-							)}
-							<span>
-								{result.summary.orphanedCatalog} orphaned catalog references
-							</span>
-						</div>
-						<div className="flex items-center gap-2">
-							{result.summary.missingNitro > 0 ? (
-								<AlertCircle className="w-4 h-4 text-[var(--admin-error)]" />
-							) : (
-								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
-							)}
-							<span>{result.summary.missingNitro} items without .nitro</span>
-						</div>
-						<div className="flex items-center gap-2">
-							{result.summary.missingIcon > 0 ? (
-								<AlertCircle className="w-4 h-4 text-[var(--admin-warning)]" />
-							) : (
-								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
-							)}
-							<span>{result.summary.missingIcon} items without icon</span>
-						</div>
-						<div className="flex items-center gap-2">
-							{result.summary.duplicates > 0 ? (
-								<AlertCircle className="w-4 h-4 text-[var(--admin-error)]" />
-							) : (
-								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
-							)}
-							<span>{result.summary.duplicates} duplicate classnames</span>
-						</div>
-						<div className="flex items-center gap-2">
-							{result.summary.missingFromSourcesTotal > 0 ? (
-								<AlertCircle className="w-4 h-4 text-[var(--admin-warning)]" />
-							) : (
-								<CheckCircle2 className="w-4 h-4 text-[var(--admin-success)]" />
-							)}
-							<span>
-								{result.summary.missingFromSourcesTotal} items missing from
-								clone sources
+								{summary.missingFromSourcesTotal} items missing from clone
+								sources
 							</span>
 						</div>
 					</div>
 
 					{/* Tabs */}
-					{hasIssues || result.missingFromSources.length > 0 ? (
+					{issues.length > 0 || missingFromSources.length > 0 ? (
 						<div className="border-b border-border">
 							<div className="flex gap-4">
 								<button
@@ -229,7 +315,7 @@ export function AuditClient() {
 											: "border-transparent text-muted-foreground hover:text-foreground"
 									}`}
 								>
-									Issues ({result.issues.length})
+									Issues ({issues.length})
 								</button>
 								<button
 									type="button"
@@ -240,16 +326,16 @@ export function AuditClient() {
 											: "border-transparent text-muted-foreground hover:text-foreground"
 									}`}
 								>
-									Missing from sources ({result.missingFromSources.length})
+									Missing from sources ({missingFromSources.length})
 								</button>
 							</div>
 						</div>
 					) : null}
 
 					{/* Issues list */}
-					{activeTab === "issues" && hasIssues && (
+					{activeTab === "issues" && issues.length > 0 && (
 						<div className="space-y-2">
-							{result.issues.map((issue) => (
+							{issues.map((issue) => (
 								<div
 									key={issue.message}
 									className={`rounded-xl border p-4 text-sm ${
@@ -262,12 +348,24 @@ export function AuditClient() {
 								>
 									<div className="flex items-start gap-2">
 										<AlertCircle
-											className={`w-4 h-4 mt-0.5 shrink-0 ${ICON_COLORS[issue.severity]}`}
+											className={`w-4 h-4 mt-0.5 shrink-0 ${
+												issue.severity === "error"
+													? "text-[var(--admin-error)]"
+													: issue.severity === "warning"
+														? "text-[var(--admin-warning)]"
+														: "text-[var(--admin-text-muted)]"
+											}`}
 										/>
 										<div className="space-y-0.5 min-w-0">
 											<div className="flex items-center gap-2 flex-wrap">
 												<span
-													className={`font-medium ${ICON_COLORS[issue.severity]}`}
+													className={`font-medium ${
+														issue.severity === "error"
+															? "text-[var(--admin-error)]"
+															: issue.severity === "warning"
+																? "text-[var(--admin-warning)]"
+																: "text-[var(--admin-text-muted)]"
+													}`}
 												>
 													{TYPE_LABELS[issue.type] || issue.type}
 												</span>
@@ -291,9 +389,9 @@ export function AuditClient() {
 					)}
 
 					{/* Missing from sources list */}
-					{activeTab === "sources" && result.missingFromSources.length > 0 && (
+					{activeTab === "sources" && missingFromSources.length > 0 && (
 						<div className="space-y-2">
-							{result.missingFromSources.map((item) => (
+							{missingFromSources.map((item) => (
 								<div
 									key={`${item.sourceId}-${item.classname}`}
 									className="rounded-xl border bg-card p-3 text-sm flex items-center gap-2"
@@ -312,8 +410,8 @@ export function AuditClient() {
 					)}
 
 					{activeTab === "issues" &&
-						!hasIssues &&
-						result.missingFromSources.length === 0 && (
+						issues.length === 0 &&
+						missingFromSources.length === 0 && (
 							<div className="rounded-xl border bg-card p-12 text-center text-muted-foreground">
 								<CheckCircle2 className="w-12 h-12 mx-auto mb-3 text-[var(--admin-success)]" />
 								<p className="text-lg font-medium">No issues found</p>
@@ -324,8 +422,11 @@ export function AuditClient() {
 					<Button
 						variant="outline"
 						onClick={() => {
-							setResult(null);
+							setSummary(null);
+							setIssues([]);
+							setMissingFromSources([]);
 							setProgress("");
+							setCheckProgress(null);
 						}}
 					>
 						Run Again
@@ -333,7 +434,7 @@ export function AuditClient() {
 				</>
 			)}
 
-			{!loading && !result && (
+			{!loading && !summary && (
 				<div className="rounded-xl border bg-card p-12 text-center text-muted-foreground">
 					<SearchX className="w-12 h-12 mx-auto mb-3 opacity-40" />
 					<p>

src/app/api/admin/import/audit/route.ts

@@ -1,13 +1,46 @@
 import { withAdmin } from "@/lib/api-handler";
-import { apiError, apiOk } from "@/lib/api-response";
 import { PERMS } from "@/lib/permissions";
 import { runCatalogAudit } from "@/lib/services/catalog-audit";
 
+function sseEvent(data: unknown): string {
+	return `data: ${JSON.stringify(data)}\n\n`;
+}
+
 export const POST = withAdmin({ permission: PERMS.ASSETS_IMPORT }, async () => {
-	try {
-		const result = await runCatalogAudit();
-		return apiOk(result as unknown as Record<string, unknown>);
-	} catch (err) {
-		return apiError(`Audit failed: ${(err as Error).message}`, 500);
-	}
+	const encoder = new TextEncoder();
+
+	const stream = new ReadableStream({
+		async start(controller) {
+			const send = (data: unknown) => {
+				try {
+					controller.enqueue(encoder.encode(sseEvent(data)));
+				} catch {
+					/* stream closed */
+				}
+			};
+
+			try {
+				await runCatalogAudit(send);
+			} catch (err) {
+				send({
+					type: "error",
+					message: `Audit threw: ${(err as Error).message}`,
+				});
+			}
+
+			try {
+				controller.close();
+			} catch {
+				/* ignore */
+			}
+		},
+	});
+
+	return new Response(stream, {
+		headers: {
+			"Content-Type": "text/event-stream",
+			"Cache-Control": "no-cache",
+			Connection: "keep-alive",
+		},
+	});
 });

src/lib/services/catalog-audit.ts

@@ -6,6 +6,23 @@ import { listSources } from "@/lib/services/clone-sources";
 import { getFurniAssetDirs } from "@/lib/services/furni-asset-dirs";
 import { ensureDirectories } from "./furni-import";
 
+export interface AuditEvent {
+	type:
+		| "progress"
+		| "items_loaded"
+		| "catalog_loaded"
+		| "checking"
+		| "batch_complete"
+		| "error";
+	message?: string;
+	current?: number;
+	total?: number;
+	section?: string;
+	issues?: AuditIssue[];
+	missingFromSources?: MissingFromSource[];
+	summary?: AuditSummary;
+}
+
 export interface AuditIssue {
 	type: string;
 	severity: "error" | "warning" | "info";
@@ -23,68 +40,106 @@ export interface MissingFromSource {
 	itemName: string;
 }
 
-export interface AuditResult {
-	issues: AuditIssue[];
-	missingFromSources: MissingFromSource[];
-	summary: {
-		totalItemsBase: number;
-		totalCatalogItems: number;
-		missingCatalog: number;
-		orphanedCatalog: number;
-		missingNitro: number;
-		missingIcon: number;
-		duplicates: number;
-		missingFromSourcesTotal: number;
-	};
+export interface AuditSummary {
+	totalItemsBase: number;
+	totalCatalogItems: number;
+	missingCatalog: number;
+	orphanedCatalog: number;
+	missingNitro: number;
+	missingIcon: number;
+	duplicates: number;
+	missingFromSourcesTotal: number;
 }
 
 export async function runCatalogAudit(
-	onProgress?: (msg: string) => void,
-): Promise<AuditResult> {
+	onEvent?: (evt: AuditEvent) => void,
+): Promise<void> {
 	const issues: AuditIssue[] = [];
 	const missingFromSources: MissingFromSource[] = [];
 
-	onProgress?.("Loading directories…");
-	await ensureDirectories();
-	const { iconDir, nitroDir } = await getFurniAssetDirs();
+	try {
+		await ensureDirectories();
+	} catch (err) {
+		onEvent?.({
+			type: "error",
+			message: `ensureDirectories failed: ${(err as Error).message}`,
+		});
+		return;
+	}
 
-	onProgress?.("Loading items_base…");
-	const items = await prisma.$queryRaw<
-		Array<{ id: number; item_name: string; public_name: string; type: string }>
-	>`SELECT id, item_name, public_name, type FROM items_base ORDER BY id`;
+	let iconDir: string;
+	let nitroDir: string;
+	try {
+		const dirs = await getFurniAssetDirs();
+		iconDir = dirs.iconDir;
+		nitroDir = dirs.nitroDir;
+	} catch (err) {
+		onEvent?.({
+			type: "error",
+			message: `getFurniAssetDirs failed: ${(err as Error).message}`,
+		});
+		return;
+	}
 
-	onProgress?.("Loading catalog_items…");
-	const catalogItems = await prisma.$queryRaw<
-		Array<{ id: number; item_ids: string; catalog_name: string }>
-	>`SELECT id, item_ids, catalog_name FROM catalog_items ORDER BY id`;
+	onEvent?.({ type: "progress", message: "Loading items_base…" });
 
-	const summary = {
-		totalItemsBase: items.length,
-		totalCatalogItems: catalogItems.length,
-		missingCatalog: 0,
-		orphanedCatalog: 0,
-		missingNitro: 0,
-		missingIcon: 0,
-		duplicates: 0,
-		missingFromSourcesTotal: 0,
-	};
+	let items: Array<{
+		id: number;
+		item_name: string;
+		public_name: string;
+		type: string;
+	}>;
+	try {
+		items = await prisma.$queryRaw<
+			Array<{
+				id: number;
+				item_name: string;
+				public_name: string;
+				type: string;
+			}>
+		>`SELECT id, item_name, public_name, type FROM items_base ORDER BY id`;
+	} catch (err) {
+		onEvent?.({
+			type: "error",
+			message: `items_base query failed: ${(err as Error).message}`,
+		});
+		return;
+	}
+
+	onEvent?.({ type: "items_loaded", total: items.length });
+
+	onEvent?.({ type: "progress", message: "Loading catalog_items…" });
+
+	let catalogItems: Array<{
+		id: number;
+		item_ids: string;
+		catalog_name: string;
+	}>;
+	try {
+		catalogItems = await prisma.$queryRaw<
+			Array<{ id: number; item_ids: string; catalog_name: string }>
+		>`SELECT id, item_ids, catalog_name FROM catalog_items ORDER BY id`;
+	} catch (err) {
+		onEvent?.({
+			type: "error",
+			message: `catalog_items query failed: ${(err as Error).message}`,
+		});
+		return;
+	}
+
+	onEvent?.({ type: "catalog_loaded", total: catalogItems.length });
 
-	// Build lookup: set of items_base IDs that have catalog entries
 	const itemIdsWithCatalog = new Set<number>();
-	const itemNamesWithCatalog = new Set<string>();
 	for (const ci of catalogItems) {
 		const ids = ci.item_ids.split(";").map(Number).filter(Boolean);
 		for (const id of ids) {
 			itemIdsWithCatalog.add(id);
 		}
-		itemNamesWithCatalog.add(ci.catalog_name);
 	}
 
-	// Build items_base lookup by id and name
 	const itemById = new Map<number, (typeof items)[0]>();
 	const itemByName = new Map<string, (typeof items)[0]>();
 	const classnameCount = new Map<string, number>();
-
 	for (const item of items) {
 		itemById.set(item.id, item);
 		itemByName.set(item.item_name, item);
@@ -94,10 +149,15 @@ export async function runCatalogAudit(
 		);
 	}
 
-	onProgress?.("Checking items_base entries…");
-	for (const item of items) {
+	onEvent?.({
+		type: "checking",
+		section: "missing_catalog",
+		total: items.length,
+	});
+
+	for (let i = 0; i < items.length; i++) {
+		const item = items[i];
 		if (!itemIdsWithCatalog.has(item.id)) {
-			summary.missingCatalog++;
 			issues.push({
 				type: "missing_catalog",
 				severity: "warning",
@@ -106,12 +166,20 @@ export async function runCatalogAudit(
 				message: `"${item.item_name}" (ID ${item.id}) has no catalog_items entry — not purchasable`,
 			});
 		}
+		if (i % 100 === 0) {
+			onEvent?.({
+				type: "checking",
+				section: "missing_catalog",
+				current: i,
+				total: items.length,
+			});
+		}
 	}
 
-	onProgress?.("Checking for duplicate classnames…");
+	onEvent?.({ type: "checking", section: "duplicates" });
+
 	for (const [name, count] of classnameCount) {
 		if (count > 1) {
-			summary.duplicates++;
 			issues.push({
 				type: "duplicate_classname",
 				severity: "error",
@@ -121,12 +189,17 @@ export async function runCatalogAudit(
 		}
 	}
 
-	onProgress?.("Checking catalog_items for orphaned references…");
-	for (const ci of catalogItems) {
+	onEvent?.({
+		type: "checking",
+		section: "orphaned_catalog",
+		total: catalogItems.length,
+	});
+
+	for (let i = 0; i < catalogItems.length; i++) {
+		const ci = catalogItems[i];
 		const ids = ci.item_ids.split(";").map(Number).filter(Boolean);
 		for (const id of ids) {
 			if (!itemById.has(id)) {
-				summary.orphanedCatalog++;
 				issues.push({
 					type: "orphaned_catalog",
 					severity: "error",
@@ -135,13 +208,26 @@ export async function runCatalogAudit(
 				});
 			}
 		}
+		if (i % 200 === 0) {
+			onEvent?.({
+				type: "checking",
+				section: "orphaned_catalog",
+				current: i,
+				total: catalogItems.length,
+			});
+		}
 	}
 
-	onProgress?.("Checking .nitro files…");
-	for (const item of items) {
+	onEvent?.({
+		type: "checking",
+		section: "missing_nitro",
+		total: items.length,
+	});
+
+	for (let i = 0; i < items.length; i++) {
+		const item = items[i];
 		const nitroPath = path.join(nitroDir, `${item.item_name}.nitro`);
 		if (!existsSync(nitroPath)) {
-			summary.missingNitro++;
 			issues.push({
 				type: "missing_nitro",
 				severity: "error",
@@ -150,13 +236,22 @@ export async function runCatalogAudit(
 				message: `"${item.item_name}" (ID ${item.id}) has no .nitro file`,
 			});
 		}
+		if (i % 100 === 0) {
+			onEvent?.({
+				type: "checking",
+				section: "missing_nitro",
+				current: i,
+				total: items.length,
+			});
+		}
 	}
 
-	onProgress?.("Checking icon files…");
-	for (const item of items) {
+	onEvent?.({ type: "checking", section: "missing_icon", total: items.length });
+
+	for (let i = 0; i < items.length; i++) {
+		const item = items[i];
 		const iconPath = path.join(iconDir, `${item.item_name}_icon.png`);
 		if (!existsSync(iconPath)) {
-			summary.missingIcon++;
 			issues.push({
 				type: "missing_icon",
 				severity: "warning",
@@ -165,50 +260,62 @@ export async function runCatalogAudit(
 				message: `"${item.item_name}" (ID ${item.id}) has no icon file`,
 			});
 		}
-	}
-
-	onProgress?.("Comparing with clone sources…");
-	try {
-		const sources = await listSources();
-		for (const source of sources) {
-			try {
-				const entries = await fetchSourceFurnidata(source.furnidataUrl);
-				for (const entry of entries) {
-					if (!itemByName.has(entry.classname)) {
-						missingFromSources.push({
-							sourceName: source.name,
-							sourceId: source.id,
-							classname: entry.classname,
-							itemName: entry.name,
-						});
-					}
-				}
-			} catch {
-				issues.push({
-					type: "source_fetch_failed",
-					severity: "error",
-					sourceName: source.name,
-					message: `Failed to fetch furnidata from "${source.name}"`,
-				});
-			}
+		if (i % 100 === 0) {
+			onEvent?.({
+				type: "checking",
+				section: "missing_icon",
+				current: i,
+				total: items.length,
+			});
 		}
-	} catch (err) {
-		issues.push({
-			type: "sources_list_failed",
-			severity: "error",
-			message: `Failed to list clone sources: ${(err as Error).message}`,
-		});
 	}
 
-	summary.missingFromSourcesTotal = missingFromSources.length;
+	onEvent?.({ type: "progress", message: "Comparing with clone sources…" });
+
+	const sources = await listSources();
+	for (const source of sources) {
+		try {
+			const entries = await fetchSourceFurnidata(source.furnidataUrl);
+			for (const entry of entries) {
+				if (!itemByName.has(entry.classname)) {
+					missingFromSources.push({
+						sourceName: source.name,
+						sourceId: source.id,
+						classname: entry.classname,
+						itemName: entry.name,
+					});
+				}
+			}
+		} catch {
+			issues.push({
+				type: "source_fetch_failed",
+				severity: "error",
+				sourceName: source.name,
+				message: `Failed to fetch furnidata from "${source.name}"`,
+			});
+		}
+	}
 
-	// Sort issues: errors first, then by type
 	issues.sort((a, b) => {
 		const sev = { error: 0, warning: 1, info: 2 };
-		const diff = (sev[a.severity] ?? 0) - (sev[b.severity] ?? 0);
-		if (diff !== 0) return diff;
-		return a.type.localeCompare(b.type);
+		return (sev[a.severity] ?? 0) - (sev[b.severity] ?? 0);
 	});
 
-	return { issues, missingFromSources, summary };
+	const summary: AuditSummary = {
+		totalItemsBase: items.length,
+		totalCatalogItems: catalogItems.length,
+		missingCatalog: issues.filter((i) => i.type === "missing_catalog").length,
+		orphanedCatalog: issues.filter((i) => i.type === "orphaned_catalog").length,
+		missingNitro: issues.filter((i) => i.type === "missing_nitro").length,
+		missingIcon: issues.filter((i) => i.type === "missing_icon").length,
+		duplicates: issues.filter((i) => i.type === "duplicate_classname").length,
+		missingFromSourcesTotal: missingFromSources.length,
+	};
+
+	onEvent?.({
+		type: "batch_complete",
+		issues,
+		missingFromSources,
+		summary,
+	});
 }