diff --git a/src/lib/services/catalog-audit.ts b/src/lib/services/catalog-audit.ts
index 18b3ed13..039de870 100644
--- a/src/lib/services/catalog-audit.ts
+++ b/src/lib/services/catalog-audit.ts
@@ -662,6 +662,65 @@ export async function runCatalogAudit(
 					remappedReferences,
 				},
 			});
+
+			// Structural repair can DELETE items_base rows (duplicate classname
+			// merge) and rewrite catalog_items.item_ids, so the missing-catalog
+			// list computed from the pre-repair snapshot is stale: entries may
+			// reference ids that no longer exist. Re-derive it from the repaired
+			// state, otherwise the generated catalog SQL would insert orphaned
+			// catalog_items rows (item_ids pointing at deleted sprite ids).
+			if (duplicateRowsRemoved > 0 || orphanedRemoved > 0) {
+				const [postItems] = (await db.execute(sql`
+					SELECT id, item_name, public_name, type, interaction_type
+					FROM items_base ORDER BY id
+				`)) as unknown as [
+					Array<{
+						id: number;
+						item_name: string;
+						public_name: string;
+						type: string;
+						interaction_type: string;
+					}>,
+					unknown,
+				];
+				items = postItems;
+
+				const [postCatalog] = (await db.execute(sql`
+					SELECT id, item_ids, catalog_name FROM catalog_items ORDER BY id
+				`)) as unknown as [
+					Array<{ id: number; item_ids: string; catalog_name: string }>,
+					unknown,
+				];
+				const postCatalogIds = new Set<number>();
+				for (const ci of postCatalog) {
+					const ids = ci.item_ids.split(";").map(Number).filter(Boolean);
+					for (const id of ids) postCatalogIds.add(id);
+				}
+
+				missingCatalogEntries.length = 0;
+				for (const item of items) {
+					let kind = classifyCatalogItem(item);
+					if (
+						kind === "furni" &&
+						(isBadgeType(item.type) || badgeGifSet.has(item.item_name))
+					) {
+						kind = "badge";
+					}
+					if (NO_CATALOG_KINDS.has(kind)) continue;
+					if (postCatalogIds.has(item.id)) continue;
+					const hasNitro = assetNameCandidates(item.item_name).nitro.some((n) =>
+						nitroSet.has(n),
+					);
+					if (kind === "pet" || hasNitro) {
+						missingCatalogEntries.push({
+							classname: item.item_name,
+							itemId: item.id,
+							itemType: item.type,
+							publicName: item.public_name,
+						});
+					}
+				}
+			}
 		} catch (err) {
 			onEvent?.({
 				type: "error",
diff --git a/src/lib/services/catalog-repair-live.test.ts b/src/lib/services/catalog-repair-live.test.ts
new file mode 100644
index 00000000..defa4949
--- /dev/null
+++ b/src/lib/services/catalog-repair-live.test.ts
@@ -0,0 +1,243 @@
+// @vitest-environment node
+// Live repair rehearsal for the catalog studio: runs the full repair pipeline
+// (orphaned refs, duplicate classnames, missing catalog SQL, furnidata repair +
+// reconcile) against a sandbox copy of the production DB and verifies the end
+// state is consistent. Writes go to a temp gamedata dir; the production
+// FurnitureData.json is only ever read (a copy is made first).
+import { promises as fs } from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { sql } from "drizzle-orm";
+import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
+import { db } from "@/lib/db";
+import {
+	generateCatalogSql,
+	repairDuplicateClassnames,
+	repairFurniData,
+	repairOrphanedCatalog,
+} from "@/lib/services/catalog-repair";
+import { reconcileFurniDataWithItemsBase } from "@/lib/services/furni-data";
+import { reconcileImportedOfferIds } from "@/lib/services/furni-import";
+import {
+	assetNameCandidates,
+	classifyCatalogItem,
+	NO_CATALOG_KINDS,
+} from "@/lib/services/item-kind";
+
+const { getGamedataRootMock, getNitroFilesRootMock, settingGetMock } =
+	vi.hoisted(() => ({
+		getGamedataRootMock: vi.fn(),
+		getNitroFilesRootMock: vi.fn(),
+		settingGetMock: vi.fn(),
+	}));
+
+vi.mock("@/lib/services/furni-asset-dirs", async (importOriginal) => {
+	const actual =
+		await importOriginal<typeof import("@/lib/services/furni-asset-dirs")>();
+	return {
+		...actual,
+		getGamedataRoot: getGamedataRootMock,
+		getNitroFilesRoot: getNitroFilesRootMock,
+	};
+});
+
+vi.mock("@/lib/services/site-settings", () => ({
+	siteSettings: { get: settingGetMock },
+}));
+
+const isSandbox =
+	process.env.DATABASE_URL?.includes("@127.0.0.1:3307") ||
+	process.env.DATABASE_URL?.includes(":@127.0.0.1:3307/") ||
+	process.env.DATABASE_URL?.includes("localhost:3307");
+
+const describeGuard = isSandbox ? describe : describe.skip;
+
+const REAL_NITRO_DIR = "/var/www/Gamedata/bundled/furniture";
+const REAL_FURNIDATA = "/var/www/Gamedata/config/FurnitureData.json";
+
+let tmpRoot: string;
+let gamedataDir: string;
+
+beforeAll(async () => {
+	tmpRoot = await fs.mkdtemp(path.join(os.tmpdir(), "furni-repair-rehearsal-"));
+	gamedataDir = path.join(tmpRoot, "Gamedata");
+	await fs.mkdir(path.join(gamedataDir, "config"), { recursive: true });
+	getGamedataRootMock.mockResolvedValue(gamedataDir);
+	getNitroFilesRootMock.mockResolvedValue("");
+	settingGetMock.mockImplementation(
+		async (key: string, fallback: string | null = null) => {
+			if (key === "furni_data_url")
+				return "/gamedata/config/FurnitureData.json";
+			if (key === "furni_data_mirror_path") return "";
+			return fallback;
+		},
+	);
+	try {
+		await fs.copyFile(
+			REAL_FURNIDATA,
+			path.join(gamedataDir, "config", "FurnitureData.json"),
+		);
+	} catch {
+		// missing copy — repair still runs against an empty file
+	}
+});
+
+afterAll(async () => {
+	await fs.rm(tmpRoot, { recursive: true, force: true });
+	vi.clearAllMocks();
+});
+
+describeGuard("catalog studio live repair rehearsal (sandbox)", () => {
+	it("runs the full repair pipeline and converges to a consistent state", async () => {
+		const itemTypeMap = (t: string) => (t === "i" || t === "s" ? "i" : "s");
+
+		const [itemRows] = (await db.execute(sql`
+				SELECT id, item_name, public_name, type FROM items_base
+			`)) as unknown as [
+			Array<{
+				id: number;
+				item_name: string;
+				public_name: string | null;
+				type: string;
+			}>,
+			unknown,
+		];
+		const [catalogRows] = (await db.execute(sql`
+				SELECT item_ids FROM catalog_items
+			`)) as unknown as [Array<{ item_ids: string }>, unknown];
+
+		const nitroFiles = new Set(
+			(await fs.readdir(REAL_NITRO_DIR).catch(() => [] as string[]))
+				.filter((f) => f.endsWith(".nitro"))
+				.map((f) => f.slice(0, -6)),
+		);
+
+		const audit = async () => {
+			const [itemRowsNow] = (await db.execute(sql`
+					SELECT id, item_name, type FROM items_base
+				`)) as unknown as [
+				Array<{ id: number; item_name: string; type: string }>,
+				unknown,
+			];
+			const [catalogRowsNow] = (await db.execute(sql`
+					SELECT item_ids FROM catalog_items
+				`)) as unknown as [Array<{ item_ids: string }>, unknown];
+			const withCatalog = new Set<number>();
+			for (const r of catalogRowsNow)
+				for (const p of String(r.item_ids ?? "").split(";")) {
+					const n = Number(p.trim());
+					if (n) withCatalog.add(n);
+				}
+			const byName = new Map<string, number>();
+			for (const r of itemRowsNow)
+				byName.set(r.item_name, (byName.get(r.item_name) ?? 0) + 1);
+			const dupGroups = [...byName].filter(([, c]) => c > 1).length;
+			const itemIds = new Set(itemRowsNow.map((r) => Number(r.id)));
+			let orphaned = 0;
+			for (const r of catalogRowsNow) {
+				const ids = String(r.item_ids ?? "")
+					.split(";")
+					.map(Number)
+					.filter(Boolean);
+				if (ids.some((i) => !itemIds.has(i))) orphaned++;
+			}
+			let missingNonSystem = 0;
+			for (const r of itemRowsNow) {
+				if (withCatalog.has(Number(r.id))) continue;
+				const kind = classifyCatalogItem(r as never);
+				if (NO_CATALOG_KINDS.has(kind)) continue;
+				missingNonSystem++;
+			}
+			return { dupGroups, orphaned, missingNonSystem };
+		};
+
+		const beforeState = await audit();
+		console.log("REHEARSAL before:", JSON.stringify(beforeState));
+
+		const orphan = await repairOrphanedCatalog();
+		console.log("REHEARSAL orphaned:", JSON.stringify(orphan));
+
+		const dup = await repairDuplicateClassnames();
+		console.log("REHEARSAL duplicates:", JSON.stringify(dup));
+
+		// Missing catalog entries (audit filter: non-system kind AND (pet OR has nitro)).
+		const entries = [];
+		const withCatalog = new Set<number>();
+		for (const r of catalogRows)
+			for (const p of String(r.item_ids ?? "").split(";")) {
+				const n = Number(p.trim());
+				if (n) withCatalog.add(n);
+			}
+		for (const r of itemRows) {
+			if (withCatalog.has(Number(r.id))) continue;
+			const kind = classifyCatalogItem(r as never);
+			if (NO_CATALOG_KINDS.has(kind)) continue;
+			const hasNitro = assetNameCandidates(r.item_name).nitro.some((n) =>
+				nitroFiles.has(n),
+			);
+			if (kind === "pet" || hasNitro) {
+				entries.push({
+					classname: r.item_name,
+					itemId: Number(r.id),
+					itemType: itemTypeMap(r.type),
+					publicName: r.public_name ?? r.item_name,
+				});
+			}
+		}
+		console.log("REHEARSAL missing catalog entries:", entries.length);
+		const catalogSql = await generateCatalogSql(entries, {
+			organizeSql: true,
+		});
+		let applied = 0;
+		let failed = 0;
+		const failures: string[] = [];
+		for (const stmt of catalogSql.statements) {
+			const trimmed = stmt.trim();
+			if (
+				!trimmed ||
+				trimmed.startsWith("--") ||
+				trimmed === "START TRANSACTION;" ||
+				trimmed === "COMMIT;"
+			)
+				continue;
+			try {
+				await db.execute(sql.raw(trimmed));
+				applied++;
+			} catch (err) {
+				failed++;
+				const e = err as { cause?: unknown; message?: string };
+				const cause =
+					typeof e.cause === "object" && e.cause !== null
+						? JSON.stringify(e.cause, Object.getOwnPropertyNames(e.cause))
+						: String(e.cause ?? "");
+				failures.push(
+					`${trimmed.slice(0, 60)} → CAUSE: ${cause.slice(0, 500)}`,
+				);
+			}
+		}
+		console.log(
+			"REHEARSAL catalog sql:",
+			JSON.stringify({ count: catalogSql.count, applied, failed }),
+		);
+		for (const f of failures) console.log("REHEARSAL sql FAILURE:", f);
+
+		const furniDataRepair = await repairFurniData(itemRows as never);
+		console.log("REHEARSAL furnidata repair:", JSON.stringify(furniDataRepair));
+
+		const reconcile = await reconcileFurniDataWithItemsBase();
+		console.log("REHEARSAL furnidata reconcile:", JSON.stringify(reconcile));
+
+		const offer = await reconcileImportedOfferIds();
+		console.log("REHEARSAL offer reconcile:", JSON.stringify(offer));
+
+		const afterState = await audit();
+		console.log("REHEARSAL after:", JSON.stringify(afterState));
+
+		expect(orphan.removed).toBeGreaterThanOrEqual(0);
+		expect(orphan.cleaned).toBeGreaterThanOrEqual(0);
+		expect(dup.merged).toBeGreaterThan(0);
+		expect(dup.rowsRemoved).toBeGreaterThan(0);
+		expect(afterState.dupGroups).toBe(0);
+		expect(afterState.orphaned).toBe(0);
+	}, 600000);
+});
diff --git a/src/lib/services/catalog-repair.ts b/src/lib/services/catalog-repair.ts
index 36934530..701e925d 100644
--- a/src/lib/services/catalog-repair.ts
+++ b/src/lib/services/catalog-repair.ts
@@ -24,6 +24,7 @@ export interface CatalogSqlResult {
 	statements: string[];
 	sql: string;
 	count: number;
+	skipped: number;
 }
 
 function escSqlLiteral(value: string): string {
@@ -341,12 +342,25 @@ export async function generateCatalogSql(
 	`)) as unknown as [Array<{ maxId: number | bigint | null }>, unknown];
 	let nextId = Number(maxIdResult[0]?.maxId ?? 0) + 1;
 
+	// Skip entries whose sprite id no longer exists in items_base (e.g. because
+	// a duplicate-classname merge ran between the audit snapshot and this
+	// generation). Inserting them would create orphaned catalog_items rows.
+	const [validIds] = (await db.execute(sql`
+		SELECT id FROM items_base
+	`)) as unknown as [Array<{ id: number }>, unknown];
+	const validItemIds = new Set(validIds.map((r) => Number(r.id)));
+	let skipped = 0;
+
 	// Build a map of caption_save → pageId so multiple items in the same
 	// category share one page (and we emit the page INSERT only once).
 	const pageMap = new Map<string, number>();
 
 	let generated = 0;
 	for (const entry of entries) {
+		if (!validItemIds.has(entry.itemId)) {
+			skipped++;
+			continue;
+		}
 		let pageId: number;
 		if (organizeSql && parentPageId) {
 			const catKey = classifyFurni(entry.classname, entry.itemType);
@@ -367,7 +381,7 @@ export async function generateCatalogSql(
 					const newId = nextPageId++;
 					pageMap.set(captionSave, newId);
 					statements.push(
-						`INSERT INTO catalog_pages (id, caption_save, caption, page_layout, parent_id, min_rank, order_num, icon_image, enabled, visible, includes, page_headline, page_teaser, page_special, page_text1, page_text2, page_text_details, page_text_teaser) VALUES (${newId}, '${escSqlLiteral(captionSave)}', '${escSqlLiteral(caption)}', 'default_3x3', ${parentPageId}, '1', ${catInfo.order}, ${catInfo.icon}, '1', '1', '', '', '', '', '', '', '');`,
+						`INSERT INTO catalog_pages (id, caption_save, caption, page_layout, parent_id, min_rank, order_num, icon_image, enabled, visible, includes, page_headline, page_teaser, page_special, page_text1, page_text2, page_text_details, page_text_teaser) VALUES (${newId}, '${escSqlLiteral(captionSave)}', '${escSqlLiteral(caption)}', 'default_3x3', ${parentPageId}, '1', ${catInfo.order}, ${catInfo.icon}, '1', '1', '', '', '', '', '', '', '', '');`,
 					);
 				}
 				existing = pageMap.get(captionSave);
@@ -394,7 +408,7 @@ export async function generateCatalogSql(
 	}
 
 	statements.push("COMMIT;");
-	return { statements, sql: statements.join("\n"), count: generated };
+	return { statements, sql: statements.join("\n"), count: generated, skipped };
 }
 
 /** Execute generated INSERT statements directly against the database. */