diff --git a/package.json b/package.json
index ef332d8..5ce9e5b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "abgeordnetenwatch-pwa",
-	"version": "2026.03.10",
+	"version": "2026.03.10.1",
 	"type": "module",
 	"scripts": {
 		"dev": "vite",
diff --git a/src/client/features/settings/components/settings-page.tsx b/src/client/features/settings/components/settings-page.tsx
index a70dc8e..c13d587 100644
--- a/src/client/features/settings/components/settings-page.tsx
+++ b/src/client/features/settings/components/settings-page.tsx
@@ -10,6 +10,7 @@ import { fetchTopics } from "@/shared/lib/aw-api"
 import {
 	APP_VERSION,
 	BACKEND_URL,
+	STORAGE_KEYS,
 	VAPID_PUBLIC_KEY,
 } from "@/shared/lib/constants"
 import { useCallback, useEffect, useState } from "react"
@@ -52,7 +53,9 @@ export function SettingsPage() {
 		string | null
 	>(null)
 	const [devReload, setDevReload] = useState<string | null>(null)
-	const [devSeedMock, setDevSeedMock] = useState<string | null>(null)
+	const [devMode, setDevMode] = useState(
+		() => localStorage.getItem(STORAGE_KEYS.devMode) === "true",
+	)
 
 	useEffect(() => {
 		loadCachedResult(db).then((cached) => {
@@ -247,227 +250,218 @@ export function SettingsPage() {
 								{deviceId}
 							</span>
 						</div>
+						<div className="flex items-center justify-between px-4 py-3">
+							<span className="text-sm" id="dev-mode-label">
+								Entwicklermodus
+							</span>
+							<Switch
+								checked={devMode}
+								aria-labelledby="dev-mode-label"
+								onCheckedChange={async (checked) => {
+									setDevMode(checked)
+									localStorage.setItem(STORAGE_KEYS.devMode, String(checked))
+									try {
+										await fetch(`${BACKEND_URL}/legislation/seed-mock`, {
+											method: checked ? "POST" : "DELETE",
+										})
+									} catch {
+										// best-effort
+									}
+								}}
+							/>
+						</div>
 					</CardContent>
 				</Card>
 			</section>
 
-			{/* --- Developer --- */}
-			<section>
-				<h2 className="text-sm font-semibold text-muted-foreground uppercase tracking-wide mb-2">
-					Entwickler
-				</h2>
-				<Card className="py-0 gap-0">
-					<CardContent className="p-0 divide-y divide-border">
-						<div className="flex items-center justify-between px-4 py-3">
-							<span className="text-sm">Backend Health</span>
-							<div className="flex items-center gap-2">
-								{devHealth && (
-									<span
-										className={`text-xs ${devHealth === "ok" ? "text-green-600" : "text-destructive"}`}
+			{/* --- Developer (visible only in dev mode) --- */}
+			{devMode && (
+				<section>
+					<h2 className="text-sm font-semibold text-muted-foreground uppercase tracking-wide mb-2">
+						Entwickler
+					</h2>
+					<Card className="py-0 gap-0">
+						<CardContent className="p-0 divide-y divide-border">
+							<div className="flex items-center justify-between px-4 py-3">
+								<span className="text-sm">Backend Health</span>
+								<div className="flex items-center gap-2">
+									{devHealth && (
+										<span
+											className={`text-xs ${devHealth === "ok" ? "text-green-600" : "text-destructive"}`}
+										>
+											{devHealth}
+										</span>
+									)}
+									<Button
+										size="sm"
+										variant="outline"
+										onClick={async () => {
+											setDevHealth(null)
+											try {
+												const res = await fetch(`${BACKEND_URL}/health`)
+												setDevHealth(res.ok ? "ok" : `${res.status}`)
+											} catch (e) {
+												setDevHealth(String(e))
+											}
+										}}
 									>
-										{devHealth}
-									</span>
-								)}
-								<Button
-									size="sm"
-									variant="outline"
-									onClick={async () => {
-										setDevHealth(null)
-										try {
-											const res = await fetch(`${BACKEND_URL}/health`)
-											setDevHealth(res.ok ? "ok" : `${res.status}`)
-										} catch (e) {
-											setDevHealth(String(e))
-										}
-									}}
-								>
-									Prüfen
-								</Button>
+										Prüfen
+									</Button>
+								</div>
 							</div>
-						</div>
-						<div className="flex items-center justify-between px-4 py-3">
-							<span className="text-sm">Test-Push</span>
-							<div className="flex items-center gap-2">
-								{devPush && (
-									<span
-										className={`text-xs ${devPush === "ok" ? "text-green-600" : "text-destructive"}`}
+							<div className="flex items-center justify-between px-4 py-3">
+								<span className="text-sm">Test-Push</span>
+								<div className="flex items-center gap-2">
+									{devPush && (
+										<span
+											className={`text-xs ${devPush === "ok" ? "text-green-600" : "text-destructive"}`}
+										>
+											{devPush}
+										</span>
+									)}
+									<Button
+										size="sm"
+										variant="outline"
+										onClick={async () => {
+											setDevPush(null)
+											try {
+												const res = await fetch(`${BACKEND_URL}/push/test`, {
+													method: "POST",
+													headers: { "Content-Type": "application/json" },
+													body: JSON.stringify({ device_id: deviceId }),
+												})
+												setDevPush(res.ok ? "ok" : `${res.status}`)
+											} catch (e) {
+												setDevPush(String(e))
+											}
+										}}
 									>
-										{devPush}
-									</span>
-								)}
-								<Button
-									size="sm"
-									variant="outline"
-									onClick={async () => {
-										setDevPush(null)
-										try {
-											const res = await fetch(`${BACKEND_URL}/push/test`, {
-												method: "POST",
-												headers: { "Content-Type": "application/json" },
-												body: JSON.stringify({ device_id: deviceId }),
-											})
-											setDevPush(res.ok ? "ok" : `${res.status}`)
-										} catch (e) {
-											setDevPush(String(e))
-										}
-									}}
-								>
-									Senden
-								</Button>
+										Senden
+									</Button>
+								</div>
 							</div>
-						</div>
-						<div className="flex items-center justify-between px-4 py-3">
-							<span className="text-sm">Alle Themen folgen</span>
-							<div className="flex items-center gap-2">
-								{devTopics && (
-									<span className="text-xs text-green-600">{devTopics}</span>
-								)}
-								<Button
-									size="sm"
-									variant="outline"
-									onClick={async () => {
-										setDevTopics(null)
-										try {
-											const topics = await fetchTopics()
-											for (const t of topics) follow("topic", t.id, t.label)
-											setDevTopics(`${topics.length}`)
-										} catch (e) {
-											setDevTopics(String(e))
-										}
-									}}
-								>
-									Folgen
-								</Button>
-							</div>
-						</div>
-						<div className="flex items-center justify-between px-4 py-3">
-							<span className="text-sm">Allen Themen entfolgen</span>
-							<div className="flex items-center gap-2">
-								{devUnfollowTopics && (
-									<span className="text-xs text-green-600">
-										{devUnfollowTopics}
-									</span>
-								)}
-								<Button
-									size="sm"
-									variant="outline"
-									onClick={async () => {
-										setDevUnfollowTopics(null)
-										await unfollowAllTopics()
-										setDevUnfollowTopics("ok")
-									}}
-								>
-									Entfolgen
-								</Button>
-							</div>
-						</div>
-						<div className="flex items-center justify-between px-4 py-3">
-							<span className="text-sm">Alle Abgeordnete folgen</span>
-							<div className="flex items-center gap-2">
-								{devPoliticians && (
-									<span className="text-xs text-green-600">
-										{devPoliticians}
-									</span>
-								)}
-								<Button
-									size="sm"
-									variant="outline"
-									onClick={async () => {
-										setDevPoliticians(null)
-										const cached = await loadCachedResult(db)
-										if (!cached || cached.mandates.length === 0) {
-											setDevPoliticians("Kein Standort-Cache")
-											return
-										}
-										for (const m of cached.mandates) {
-											follow("politician", m.politician.id, m.politician.label)
-										}
-										setDevPoliticians(`${cached.mandates.length}`)
-									}}
-								>
-									Folgen
-								</Button>
-							</div>
-						</div>
-						<div className="flex items-center justify-between px-4 py-3">
-							<span className="text-sm">Allen Abgeordneten entfolgen</span>
-							<div className="flex items-center gap-2">
-								{devUnfollowPoliticians && (
-									<span className="text-xs text-green-600">
-										{devUnfollowPoliticians}
-									</span>
-								)}
-								<Button
-									size="sm"
-									variant="outline"
-									onClick={async () => {
-										setDevUnfollowPoliticians(null)
-										await unfollowAllPoliticians()
-										setDevUnfollowPoliticians("ok")
-									}}
-								>
-									Entfolgen
-								</Button>
-							</div>
-						</div>
-						<div className="flex items-center justify-between px-4 py-3">
-							<span className="text-sm">Testdaten laden</span>
-							<div className="flex items-center gap-2">
-								{devSeedMock && (
-									<span
-										className={`text-xs ${devSeedMock.startsWith("ok") ? "text-green-600" : "text-destructive"}`}
+							<div className="flex items-center justify-between px-4 py-3">
+								<span className="text-sm">Alle Themen folgen</span>
+								<div className="flex items-center gap-2">
+									{devTopics && (
+										<span className="text-xs text-green-600">{devTopics}</span>
+									)}
+									<Button
+										size="sm"
+										variant="outline"
+										onClick={async () => {
+											setDevTopics(null)
+											try {
+												const topics = await fetchTopics()
+												for (const t of topics) follow("topic", t.id, t.label)
+												setDevTopics(`${topics.length}`)
+											} catch (e) {
+												setDevTopics(String(e))
+											}
+										}}
 									>
-										{devSeedMock}
-									</span>
-								)}
-								<Button
-									size="sm"
-									variant="outline"
-									onClick={async () => {
-										setDevSeedMock(null)
-										try {
-											const res = await fetch(
-												`${BACKEND_URL}/legislation/seed-mock`,
-												{ method: "POST" },
-											)
-											if (!res.ok) {
-												setDevSeedMock(`${res.status}`)
+										Folgen
+									</Button>
+								</div>
+							</div>
+							<div className="flex items-center justify-between px-4 py-3">
+								<span className="text-sm">Allen Themen entfolgen</span>
+								<div className="flex items-center gap-2">
+									{devUnfollowTopics && (
+										<span className="text-xs text-green-600">
+											{devUnfollowTopics}
+										</span>
+									)}
+									<Button
+										size="sm"
+										variant="outline"
+										onClick={async () => {
+											setDevUnfollowTopics(null)
+											await unfollowAllTopics()
+											setDevUnfollowTopics("ok")
+										}}
+									>
+										Entfolgen
+									</Button>
+								</div>
+							</div>
+							<div className="flex items-center justify-between px-4 py-3">
+								<span className="text-sm">Alle Abgeordnete folgen</span>
+								<div className="flex items-center gap-2">
+									{devPoliticians && (
+										<span className="text-xs text-green-600">
+											{devPoliticians}
+										</span>
+									)}
+									<Button
+										size="sm"
+										variant="outline"
+										onClick={async () => {
+											setDevPoliticians(null)
+											const cached = await loadCachedResult(db)
+											if (!cached || cached.mandates.length === 0) {
+												setDevPoliticians("Kein Standort-Cache")
 												return
 											}
-											const data = await res.json()
-											setDevSeedMock(`ok (${data.count})`)
-										} catch (e) {
-											setDevSeedMock(String(e))
-										}
-									}}
-								>
-									Laden
-								</Button>
+											for (const m of cached.mandates) {
+												follow(
+													"politician",
+													m.politician.id,
+													m.politician.label,
+												)
+											}
+											setDevPoliticians(`${cached.mandates.length}`)
+										}}
+									>
+										Folgen
+									</Button>
+								</div>
 							</div>
-						</div>
-						<div className="flex items-center justify-between px-4 py-3">
-							<span className="text-sm">Abgeordnete neu laden</span>
-							<div className="flex items-center gap-2">
-								{devReload && (
-									<span className="text-xs text-green-600">{devReload}</span>
-								)}
-								<Button
-									size="sm"
-									variant="outline"
-									disabled={loading || !hasLocation}
-									onClick={() => {
-										setDevReload(null)
-										detect(true)
-										setDevReload("gestartet")
-									}}
-								>
-									Neu laden
-								</Button>
+							<div className="flex items-center justify-between px-4 py-3">
+								<span className="text-sm">Allen Abgeordneten entfolgen</span>
+								<div className="flex items-center gap-2">
+									{devUnfollowPoliticians && (
+										<span className="text-xs text-green-600">
+											{devUnfollowPoliticians}
+										</span>
+									)}
+									<Button
+										size="sm"
+										variant="outline"
+										onClick={async () => {
+											setDevUnfollowPoliticians(null)
+											await unfollowAllPoliticians()
+											setDevUnfollowPoliticians("ok")
+										}}
+									>
+										Entfolgen
+									</Button>
+								</div>
 							</div>
-						</div>
-					</CardContent>
-				</Card>
-			</section>
+							<div className="flex items-center justify-between px-4 py-3">
+								<span className="text-sm">Abgeordnete neu laden</span>
+								<div className="flex items-center gap-2">
+									{devReload && (
+										<span className="text-xs text-green-600">{devReload}</span>
+									)}
+									<Button
+										size="sm"
+										variant="outline"
+										disabled={loading || !hasLocation}
+										onClick={() => {
+											setDevReload(null)
+											detect(true)
+											setDevReload("gestartet")
+										}}
+									>
+										Neu laden
+									</Button>
+								</div>
+							</div>
+						</CardContent>
+					</Card>
+				</section>
+			)}
 		</div>
 	)
 }
diff --git a/src/client/shared/lib/constants.ts b/src/client/shared/lib/constants.ts
index 64e9dac..99a69d2 100644
--- a/src/client/shared/lib/constants.ts
+++ b/src/client/shared/lib/constants.ts
@@ -1,4 +1,4 @@
-export const APP_VERSION = "2026.03.10"
+export const APP_VERSION = "2026.03.10.1"
 
 export const AW_API_BASE = "https://www.abgeordnetenwatch.de/api/v2"
 export const AW_API_TIMEOUT_MS = 20_000
@@ -20,4 +20,5 @@ export const STORAGE_KEYS = {
 	follows: "agw_follows",
 	geoCache: "agw_geo_cache",
 	pushEnabled: "agw_push_enabled",
+	devMode: "agw_dev_mode",
 } as const
diff --git a/src/server/features/legislation/router.ts b/src/server/features/legislation/router.ts
index 2ce5254..45c46e7 100644
--- a/src/server/features/legislation/router.ts
+++ b/src/server/features/legislation/router.ts
@@ -2,6 +2,7 @@ import { Hono } from "hono"
 import { castVoteSchema } from "./schema"
 import {
 	castVote,
+	deleteMockLegislation,
 	getLegislation,
 	getLegislationResults,
 	getLegislationText,
@@ -18,6 +19,11 @@ legislationRouter.post("/seed-mock", async (c) => {
 	return c.json({ ok: true, count: ids.length, ids }, 201)
 })
 
+legislationRouter.delete("/seed-mock", async (c) => {
+	const count = await deleteMockLegislation()
+	return c.json({ ok: true, deleted: count })
+})
+
 legislationRouter.get("/upcoming", async (c) => {
 	const items = await getUpcomingLegislation()
 	return c.json(items)
diff --git a/src/server/features/legislation/service.ts b/src/server/features/legislation/service.ts
index a64ec9d..e0278a9 100644
--- a/src/server/features/legislation/service.ts
+++ b/src/server/features/legislation/service.ts
@@ -1,4 +1,4 @@
-import { and, desc, eq } from "drizzle-orm"
+import { and, desc, eq, inArray } from "drizzle-orm"
 import { db } from "../../shared/db/client"
 import {
 	legislationSummaries,
@@ -254,3 +254,19 @@ export async function seedMockLegislation() {
 
 	return inserted
 }
+
+const MOCK_IDS = MOCK_LEGISLATION.map((m) => m.dipVorgangsId)
+
+export async function deleteMockLegislation() {
+	const rows = await db
+		.select({ id: legislationTexts.id })
+		.from(legislationTexts)
+		.where(inArray(legislationTexts.dipVorgangsId, MOCK_IDS))
+
+	if (rows.length === 0) return 0
+
+	const ids = rows.map((r) => r.id)
+	await db.delete(legislationTexts).where(inArray(legislationTexts.id, ids))
+
+	return ids.length
+}