diff --git a/web/src/lib/settings/revision-settings.schema.ts b/web/src/lib/settings/revision-settings.schema.ts
index 3c98a61..b2d0e6c 100644
--- a/web/src/lib/settings/revision-settings.schema.ts
+++ b/web/src/lib/settings/revision-settings.schema.ts
@@ -1,7 +1,18 @@
 import { z } from 'zod';
 
-export const revisionSettingsSchema = z.object({
-	revision_retention_minutes: z.string().refine(
+/** HTML type=number binds number; API/store may return number — normalize to string for validation. */
+function retentionMinutesInput(val: unknown): string {
+	if (val === undefined || val === null) return '';
+	if (typeof val === 'number') {
+		if (!Number.isFinite(val)) return '';
+		return String(Math.trunc(val));
+	}
+	return String(val);
+}
+
+const revisionRetentionMinutes = z.preprocess(
+	retentionMinutesInput,
+	z.string().refine(
 		(v) => {
 			const s = v.trim();
 			if (s === '') return true;
@@ -10,6 +21,10 @@ export const revisionSettingsSchema = z.object({
 		},
 		{ message: 'TTL ревизий должен быть целым числом от 15 до 43200 минут' }
 	)
+);
+
+export const revisionSettingsSchema = z.object({
+	revision_retention_minutes: revisionRetentionMinutes
 });
 
 export type RevisionSettingsForm = z.infer<typeof revisionSettingsSchema>;