diff --git a/changelog.d/fixes/13197-deprecated-provider-purge.md b/changelog.d/fixes/13197-deprecated-provider-purge.md
new file mode 100644
index 0000000000..aa7f960b32
--- /dev/null
+++ b/changelog.d/fixes/13197-deprecated-provider-purge.md
@@ -0,0 +1 @@
+- **fix(dashboard):** leftover catalog-removed provider rows (gemini-cli) can be listed and purged from the providers page ([#13067](https://github.com/diegosouzapw/OmniRoute/issues/13067)) ([#13197](https://github.com/diegosouzapw/OmniRoute/pull/13197))
diff --git a/src/app/(dashboard)/dashboard/providers/components/DeprecatedProviderBanner.tsx b/src/app/(dashboard)/dashboard/providers/components/DeprecatedProviderBanner.tsx
new file mode 100644
index 0000000000..d64d799b97
--- /dev/null
+++ b/src/app/(dashboard)/dashboard/providers/components/DeprecatedProviderBanner.tsx
@@ -0,0 +1,145 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { useTranslations } from "next-intl";
+import { Button, Card, ConfirmModal } from "@/shared/components";
+import { useNotificationStore } from "@/store/notificationStore";
+import type { DeprecatedProviderLeftoverGroup } from "@/lib/providers/deprecatedProviderCleanup";
+
+type ProviderMessageTranslator = ((
+  key: string,
+  values?: Record<string, unknown>
+) => string) & {
+  has?: (key: string) => boolean;
+};
+
+function providerText(
+  t: ProviderMessageTranslator,
+  key: string,
+  fallback: string,
+  values?: Record<string, unknown>
+): string {
+  if (typeof t.has === "function" && t.has(key)) {
+    return t(key, values);
+  }
+  if (values) {
+    return Object.entries(values).reduce(
+      (acc, [name, value]) => acc.replaceAll(`{${name}}`, String(value)),
+      fallback
+    );
+  }
+  return fallback;
+}
+
+
+export default function DeprecatedProviderBanner() {
+  const t = useTranslations("providers") as ProviderMessageTranslator;
+  const notify = useNotificationStore();
+  const [leftovers, setLeftovers] = useState<DeprecatedProviderLeftoverGroup[]>([]);
+  const [dismissed, setDismissed] = useState<Record<string, boolean>>({});
+  const [pending, setPending] = useState<DeprecatedProviderLeftoverGroup | null>(null);
+  const [purging, setPurging] = useState(false);
+
+  useEffect(() => {
+    let cancelled = false;
+    void fetch("/api/providers/deprecated", { credentials: "same-origin" })
+      .then((res) => (res.ok ? res.json() : { leftovers: [] }))
+      .then((body: { leftovers?: DeprecatedProviderLeftoverGroup[] }) => {
+        if (cancelled) return;
+        setLeftovers(Array.isArray(body?.leftovers) ? body.leftovers : []);
+      })
+      .catch(() => {
+        if (!cancelled) setLeftovers([]);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, []);
+
+  const visible = leftovers.filter((row) => !dismissed[row.provider]);
+  if (visible.length === 0) return null;
+
+  async function purge(provider: string) {
+    setPurging(true);
+    try {
+      const res = await fetch("/api/providers/deprecated", {
+        method: "POST",
+        credentials: "same-origin",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ provider }),
+      });
+      if (res.ok) {
+        setLeftovers((prev) => prev.filter((row) => row.provider !== provider));
+        notify.success(
+          providerText(t, "purgeLeftoversSuccess", "Leftover connections removed.")
+        );
+      } else {
+        notify.error(
+          providerText(t, "purgeLeftoversFailed", "Failed to purge leftover connections.")
+        );
+      }
+    } catch {
+      notify.error(
+        providerText(t, "purgeLeftoversFailed", "Failed to purge leftover connections.")
+      );
+    } finally {
+      setPurging(false);
+      setPending(null);
+    }
+  }
+
+  return (
+    <>
+      {visible.map((row) => {
+        const n = row.connectionIds.length;
+        return (
+          <Card key={row.provider} padding="lg">
+            <p className="text-sm text-text-main">
+              {providerText(
+                t,
+                "deprecatedProviderLeftover",
+                "Provider {name} was removed from OmniRoute. {n} leftover connection(s) are still in the database and cannot be opened from a card. Re-add the account under {migrateTo}, then remove leftovers.",
+                { name: row.provider, n, migrateTo: row.migrateTo }
+              )}
+            </p>
+            <div className="mt-3 flex flex-wrap gap-2">
+              <Button variant="danger" size="sm" onClick={() => setPending(row)}>
+                {providerText(t, "purgeLeftovers", "Purge leftovers")}
+              </Button>
+              <Button
+                variant="ghost"
+                size="sm"
+                onClick={() =>
+                  setDismissed((prev) => ({ ...prev, [row.provider]: true }))
+                }
+              >
+                {providerText(t, "dismissForSession", "Dismiss for this session")}
+              </Button>
+            </div>
+          </Card>
+        );
+      })}
+      <ConfirmModal
+        isOpen={pending !== null}
+        onClose={() => setPending(null)}
+        onConfirm={() => {
+          if (pending) return purge(pending.provider);
+        }}
+        title={providerText(t, "purgeLeftovers", "Purge leftovers")}
+        message={
+          pending
+            ? providerText(
+                t,
+                "purgeLeftoversConfirm",
+                "Remove {n} leftover {name} connection(s)? This cannot be undone.",
+                { name: pending.provider, n: pending.connectionIds.length }
+              )
+            : ""
+        }
+        confirmText={providerText(t, "purgeLeftovers", "Purge leftovers")}
+        cancelText={providerText(t, "cancel", "Cancel")}
+        loading={purging}
+      />
+    </>
+  );
+}
diff --git a/src/app/(dashboard)/dashboard/providers/page.tsx b/src/app/(dashboard)/dashboard/providers/page.tsx
index a9cde7c6f7..c093ef2a95 100644
--- a/src/app/(dashboard)/dashboard/providers/page.tsx
+++ b/src/app/(dashboard)/dashboard/providers/page.tsx
@@ -61,6 +61,7 @@ import NoAuthProvidersSection from "./components/NoAuthProvidersSection";
 import HighlightableProviderCard from "./components/HighlightableProviderCard";
 import ProviderCountBadge from "./components/ProviderCountBadge";
 import ProviderSummaryCard from "./components/ProviderSummaryCard";
+import DeprecatedProviderBanner from "./components/DeprecatedProviderBanner";
 import {
   buildCompactProviderEntriesForPage,
   getCompactProviderAuthType,
@@ -331,8 +332,6 @@ function ProvidersPageContent() {
     setOauthEnvRepairStatus(await loadOauthEnvRepairStatus());
   }, []);
 
-  // Inline-in-effect (calling the component-scope callback synchronously from
-  // an effect is rejected by the compiler rules); setState runs after the await.
   useEffect(() => {
     const run = async () => {
       const status = await loadOauthEnvRepairStatus();
@@ -463,8 +462,6 @@ function ProvidersPageContent() {
 
   // Toggle all connections for a provider on/off
   const handleToggleProvider = async (providerId: string, authType: string, newActive: boolean) => {
-    // Mirror getProviderStats: dual-auth providers (qoder, …) toggle BOTH their
-    // oauth and apikey/PAT connections from the single OAuth card.
     const matchesToggle = (c: { provider: string; authType?: string }) =>
       connectionMatchesProviderCard(c, providerId, authType as "oauth" | "free" | "apikey");
     const providerConns = connections.filter(matchesToggle);
@@ -892,6 +889,9 @@ function ProvidersPageContent() {
   return (
     <OpenRouterProviderStatsProvider entries={openRouterProviderStats}>
       <div className="flex flex-col gap-6">
+          <DeprecatedProviderBanner />
+
+
         {showFirstProviderHint && (
           <Card padding="lg">
             <div className="flex flex-col items-center justify-center text-center">
diff --git a/src/app/api/providers/deprecated/route.ts b/src/app/api/providers/deprecated/route.ts
new file mode 100644
index 0000000000..f3e445ee4c
--- /dev/null
+++ b/src/app/api/providers/deprecated/route.ts
@@ -0,0 +1,78 @@
+import { NextResponse } from "next/server";
+import { z } from "zod";
+import { getAuditRequestContext, logAuditEvent } from "@/lib/compliance/index";
+import { requireManagementAuth } from "@/lib/api/requireManagementAuth";
+import { getRawProviderConnections } from "@/lib/db/providers";
+import { deleteProviderConnectionsByProvider } from "@/lib/db/providers/deletion";
+import { listDeprecatedProviderLeftovers } from "@/lib/providers/deprecatedProviderCleanup";
+import { isDeprecatedProvider } from "@omniroute/open-sse/services/tokenRefresh.ts";
+import { isValidationFailure, validateBody } from "@/shared/validation/helpers";
+
+const purgeSchema = z.object({
+  provider: z.string().min(1),
+});
+
+export async function GET(request: Request) {
+  const authError = await requireManagementAuth(request);
+  if (authError) return authError;
+
+  const rows = await getRawProviderConnections({}, undefined, undefined, [
+    "id",
+    "provider",
+    "name",
+  ]);
+  const connections = rows.flatMap((row) => {
+    if (typeof row.id !== "string") return [];
+    return [
+      {
+        id: row.id,
+        provider: typeof row.provider === "string" ? row.provider : null,
+        name: typeof row.name === "string" ? row.name : null,
+      },
+    ];
+  });
+  return NextResponse.json({ leftovers: listDeprecatedProviderLeftovers(connections) });
+}
+
+export async function POST(request: Request) {
+  const authError = await requireManagementAuth(request);
+  if (authError) return authError;
+
+  const auditContext = getAuditRequestContext(request);
+
+  let body: unknown;
+  try {
+    body = await request.json();
+  } catch {
+    return NextResponse.json({ error: "Invalid JSON body" }, { status: 400 });
+  }
+
+  const validation = validateBody(purgeSchema, body);
+  if (isValidationFailure(validation)) {
+    return NextResponse.json({ error: validation.error }, { status: 400 });
+  }
+
+  const { provider } = validation.data;
+  if (!isDeprecatedProvider(provider)) {
+    return NextResponse.json({ error: "Provider is not deprecated" }, { status: 400 });
+  }
+
+  const deleted = Number(await deleteProviderConnectionsByProvider(provider) || 0);
+
+  logAuditEvent({
+    action: "provider.credentials.revoked",
+    actor: "admin",
+    target: provider,
+    resourceType: "provider_credentials",
+    status: "success",
+    ipAddress: auditContext.ipAddress || undefined,
+    requestId: auditContext.requestId,
+    metadata: {
+      provider,
+      reason: "deprecated_provider_purge",
+      deleted,
+    },
+  });
+
+  return NextResponse.json({ deleted });
+}
diff --git a/src/lib/db/providers/deletion.ts b/src/lib/db/providers/deletion.ts
index 965fd3734b..39cbec3a4e 100644
--- a/src/lib/db/providers/deletion.ts
+++ b/src/lib/db/providers/deletion.ts
@@ -19,6 +19,7 @@ import {
 import { invalidateDbCache } from "../readCache";
 import { invalidateReasoningRoutingRuleCache } from "../reasoningRoutingRules";
 import { bumpProxyConfigGeneration } from "../settings";
+import { deleteSyncedAvailableModelsForProvider } from "../models";
 import { toRecord } from "./columns";
 
 interface StatementLike<TRow = unknown> {
@@ -189,6 +190,12 @@ export async function deleteProviderConnectionsByProvider(providerId: string) {
   backupDbFile("pre-write");
   invalidateDbCache("connections");
   invalidateReasoningRoutingRuleCache();
+  bumpProxyConfigGeneration();
+  try {
+    await deleteSyncedAvailableModelsForProvider(providerId);
+  } catch {
+    // Rows are already gone. Do not turn a leftover purge into a 500.
+  }
   return result.changes;
 }
 
diff --git a/src/lib/providers/deprecatedProviderCleanup.ts b/src/lib/providers/deprecatedProviderCleanup.ts
new file mode 100644
index 0000000000..8443dc286d
--- /dev/null
+++ b/src/lib/providers/deprecatedProviderCleanup.ts
@@ -0,0 +1,49 @@
+import {
+  getDeprecationNotice,
+  isDeprecatedProvider,
+} from "@omniroute/open-sse/services/tokenRefresh.ts";
+
+export function isOrphanDeprecatedConnection(conn: { provider?: string | null }): boolean {
+  return isDeprecatedProvider(String(conn.provider || ""));
+}
+
+export type DeprecatedProviderLeftoverGroup = {
+  provider: string;
+  migrateTo: string;
+  reason: string;
+  connectionIds: string[];
+  names: string[];
+};
+
+export function listDeprecatedProviderLeftovers(
+  connections: Array<{
+    id: string;
+    provider?: string | null;
+    name?: string | null;
+  }>
+): DeprecatedProviderLeftoverGroup[] {
+  const groups = new Map<string, DeprecatedProviderLeftoverGroup>();
+
+  for (const conn of connections) {
+    if (!isOrphanDeprecatedConnection(conn)) continue;
+    const provider = String(conn.provider || "");
+    const notice = getDeprecationNotice(provider);
+    if (!notice) continue;
+
+    let group = groups.get(provider);
+    if (!group) {
+      group = {
+        provider,
+        migrateTo: notice.migrateTo,
+        reason: notice.reason,
+        connectionIds: [],
+        names: [],
+      };
+      groups.set(provider, group);
+    }
+    group.connectionIds.push(conn.id);
+    group.names.push(typeof conn.name === "string" ? conn.name : "");
+  }
+
+  return [...groups.values()].filter((group) => group.connectionIds.length > 0);
+}
diff --git a/tests/unit/deprecated-provider-banner-13067.test.ts b/tests/unit/deprecated-provider-banner-13067.test.ts
new file mode 100644
index 0000000000..19043b84b9
--- /dev/null
+++ b/tests/unit/deprecated-provider-banner-13067.test.ts
@@ -0,0 +1,70 @@
+/**
+ * leftover banner must stay session-only: no localStorage/sessionStorage.
+ */
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import path from "node:path";
+import test from "node:test";
+import { fileURLToPath } from "node:url";
+
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
+const bannerPath = path.join(
+  repoRoot,
+  "src/app/(dashboard)/dashboard/providers/components/DeprecatedProviderBanner.tsx"
+);
+const pagePath = path.join(repoRoot, "src/app/(dashboard)/dashboard/providers/page.tsx");
+
+test("banner file exists and never persists dismiss in web storage", () => {
+  assert.ok(fs.existsSync(bannerPath), "DeprecatedProviderBanner.tsx must exist");
+  const source = fs.readFileSync(bannerPath, "utf8");
+  assert.equal(source.includes("localStorage"), false);
+  assert.equal(source.includes("sessionStorage"), false);
+  assert.equal(source.includes("../../providerPageHelpers"), false);
+  assert.match(source, /fetch\(\s*"\/api\/providers\/deprecated"/);
+  assert.match(source, /method:\s*"POST"/);
+  assert.match(source, /credentials:\s*"same-origin"/);
+});
+
+test("providers page mounts the leftover banner", () => {
+  const source = fs.readFileSync(pagePath, "utf8");
+  assert.match(source, /DeprecatedProviderBanner/);
+});
+
+test("providers page stays frozen at 2025 lines", () => {
+  const lines = fs.readFileSync(pagePath, "utf8").split("\n").length;
+  assert.equal(lines, 2025);
+});
+
+test("purge surfaces notify.error when POST is not ok", () => {
+  const source = fs.readFileSync(bannerPath, "utf8");
+  assert.match(source, /useNotificationStore/);
+  assert.match(source, /notify\.error\(/);
+  const purgeIdx = source.indexOf("async function purge");
+  assert.ok(purgeIdx >= 0, "purge helper must exist");
+  const purgeBody = source.slice(purgeIdx);
+  const okIdx = purgeBody.indexOf("if (res.ok)");
+  const errIdx = purgeBody.indexOf("notify.error(");
+  assert.ok(okIdx >= 0, "purge must branch on res.ok");
+  assert.ok(errIdx > okIdx, "failed POST must notify after the ok branch");
+});
+
+test("purge surfaces notify.success when POST is ok", () => {
+  const source = fs.readFileSync(bannerPath, "utf8");
+  const purgeIdx = source.indexOf("async function purge");
+  assert.ok(purgeIdx >= 0, "purge helper must exist");
+  const purgeBody = source.slice(purgeIdx);
+  const okIdx = purgeBody.indexOf("if (res.ok)");
+  const successIdx = purgeBody.indexOf("notify.success(");
+  assert.ok(okIdx >= 0, "purge must branch on res.ok");
+  assert.ok(successIdx > okIdx, "successful POST must notify.success in the ok branch");
+});
+
+test("banner leftover type comes from the classifier module", () => {
+  const source = fs.readFileSync(bannerPath, "utf8");
+  assert.match(source, /DeprecatedProviderLeftoverGroup/);
+  assert.match(
+    source,
+    /from\s+["']@\/lib\/providers\/deprecatedProviderCleanup["']/
+  );
+  assert.equal(source.includes("type LeftoverGroup = {"), false);
+});
diff --git a/tests/unit/deprecated-provider-by-provider-cleanup-13067.test.ts b/tests/unit/deprecated-provider-by-provider-cleanup-13067.test.ts
new file mode 100644
index 0000000000..9ddfc9332a
--- /dev/null
+++ b/tests/unit/deprecated-provider-by-provider-cleanup-13067.test.ts
@@ -0,0 +1,144 @@
+/**
+ * by-provider leftover purge must finish the same post-steps as
+ * single-row delete: bump the proxy cache generation and drop
+ * synced model lists for that provider.
+ */
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import test from "node:test";
+import { fileURLToPath } from "node:url";
+
+const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-13067-by-provider-"));
+process.env.DATA_DIR = TEST_DATA_DIR;
+process.env.DISABLE_SQLITE_AUTO_BACKUP = "true";
+
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
+const deletionPath = path.join(repoRoot, "src/lib/db/providers/deletion.ts");
+
+const core = await import("../../src/lib/db/core.ts");
+const providersDb = await import("../../src/lib/db/providers.ts");
+const models = await import("../../src/lib/db/models.ts");
+
+const TEST_PROVIDER = "__test_provider_13067__";
+const OTHER_PROVIDER = "__other_provider_13067__";
+
+function extractFunctionBody(source: string, name: string): string {
+  const start = source.indexOf(`export async function ${name}`);
+  assert.ok(start >= 0, `${name} must exist`);
+  const nextExport = source.indexOf("\nexport ", start + 1);
+  return nextExport >= 0 ? source.slice(start, nextExport) : source.slice(start);
+}
+
+async function resetStorage() {
+  core.resetDbInstance();
+  for (let attempt = 0; attempt < 10; attempt++) {
+    try {
+      if (fs.existsSync(TEST_DATA_DIR)) {
+        fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 });
+      }
+      break;
+    } catch (error: unknown) {
+      const code = (error as { code?: string } | undefined)?.code;
+      if ((code === "EBUSY" || code === "EPERM") && attempt < 9) {
+        await new Promise((resolve) => setTimeout(resolve, 50 * (attempt + 1)));
+      } else {
+        throw error;
+      }
+    }
+  }
+  fs.mkdirSync(TEST_DATA_DIR, { recursive: true });
+}
+
+test.beforeEach(async () => {
+  await resetStorage();
+});
+
+test.after(async () => {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 });
+});
+
+test("by-provider delete calls proxy bump and synced-model purge", () => {
+  const source = fs.readFileSync(deletionPath, "utf8");
+  const body = extractFunctionBody(source, "deleteProviderConnectionsByProvider");
+  assert.match(
+    source,
+    /deleteSyncedAvailableModelsForProvider/,
+    "deletion helper must import the existing synced-model purge"
+  );
+  assert.match(
+    body,
+    /\bbumpProxyConfigGeneration\s*\(/,
+    "by-provider path must bump proxy generation like single-row delete"
+  );
+  assert.match(
+    body,
+    /\bdeleteSyncedAvailableModelsForProvider\s*\(/,
+    "by-provider path must drop synced models for the purged provider"
+  );
+});
+
+test("single-row delete does not take the by-provider synced-model helper", () => {
+  const source = fs.readFileSync(deletionPath, "utf8");
+  const body = extractFunctionBody(source, "deleteProviderConnection");
+  assert.match(body, /\bbumpProxyConfigGeneration\s*\(/);
+  assert.doesNotMatch(
+    body,
+    /\bdeleteSyncedAvailableModelsForProvider\s*\(/,
+    "per-id delete already cleans models at the route; do not fork a second deleter here"
+  );
+});
+
+test("by-provider delete drops this provider's synced models and leaves others", async () => {
+  const target = await providersDb.createProviderConnection({
+    provider: TEST_PROVIDER,
+    authType: "apikey",
+    name: "leftover-a",
+    apiKey: `sk-13067-a-${Date.now()}`,
+  });
+  const sibling = await providersDb.createProviderConnection({
+    provider: TEST_PROVIDER,
+    authType: "apikey",
+    name: "leftover-b",
+    apiKey: `sk-13067-b-${Date.now()}`,
+  });
+  const other = await providersDb.createProviderConnection({
+    provider: OTHER_PROVIDER,
+    authType: "apikey",
+    name: "keep-me",
+    apiKey: `sk-13067-keep-${Date.now()}`,
+  });
+  assert.ok(target?.id && sibling?.id && other?.id);
+
+  await models.replaceSyncedAvailableModelsForConnection(TEST_PROVIDER, target.id, [
+    { id: "orphan-model", name: "Orphan" },
+  ]);
+  await models.replaceSyncedAvailableModelsForConnection(TEST_PROVIDER, sibling.id, [
+    { id: "orphan-model-2", name: "Orphan 2" },
+  ]);
+  await models.replaceSyncedAvailableModelsForConnection(OTHER_PROVIDER, other.id, [
+    { id: "keep-model", name: "Keep" },
+  ]);
+
+  const deleted = await providersDb.deleteProviderConnectionsByProvider(TEST_PROVIDER);
+  assert.equal(deleted, 2);
+
+  assert.deepEqual(await models.getSyncedAvailableModelsForConnection(TEST_PROVIDER, target.id), []);
+  assert.deepEqual(await models.getSyncedAvailableModelsForConnection(TEST_PROVIDER, sibling.id), []);
+  const kept = await models.getSyncedAvailableModelsForConnection(OTHER_PROVIDER, other.id);
+  assert.equal(kept.length, 1);
+  assert.equal(kept[0]?.id, "keep-model");
+});
+
+test("by-provider synced-model purge must not fail the delete", () => {
+  const source = fs.readFileSync(deletionPath, "utf8");
+  const body = extractFunctionBody(source, "deleteProviderConnectionsByProvider");
+  const syncedIdx = body.indexOf("deleteSyncedAvailableModelsForProvider(");
+  assert.ok(syncedIdx >= 0, "by-provider path must purge synced models");
+  const tryIdx = body.lastIndexOf("try {", syncedIdx);
+  const catchIdx = body.indexOf("catch", syncedIdx);
+  assert.ok(tryIdx >= 0 && tryIdx < syncedIdx, "synced purge must sit in try");
+  assert.ok(catchIdx > syncedIdx, "synced purge must be caught so delete still returns");
+});
diff --git a/tests/unit/deprecated-provider-orphan-13067.test.ts b/tests/unit/deprecated-provider-orphan-13067.test.ts
new file mode 100644
index 0000000000..1bff618930
--- /dev/null
+++ b/tests/unit/deprecated-provider-orphan-13067.test.ts
@@ -0,0 +1,50 @@
+/**
+ * leftover catalog-removed provider rows (#13067).
+ *
+ * Classifier only: isDeprecatedProvider latch. Custom openai-compatible-*
+ * nodes must never become leftovers.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import {
+  isOrphanDeprecatedConnection,
+  listDeprecatedProviderLeftovers,
+} from "../../src/lib/providers/deprecatedProviderCleanup.ts";
+
+test("classifier matrix: only catalog-removed ids are leftovers", () => {
+  const cases: Array<{ provider?: string | null; leftover: boolean }> = [
+    { provider: "gemini-cli", leftover: true },
+    { provider: "gemini", leftover: false },
+    { provider: "openai-compatible-foo", leftover: false },
+    { provider: "anthropic-compatible-bar", leftover: false },
+    { provider: "anthropic-compatible-cc-baz", leftover: false },
+    { provider: "", leftover: false },
+    { leftover: false },
+    { provider: "Gemini-CLI", leftover: false },
+  ];
+
+  for (const row of cases) {
+    assert.equal(
+      isOrphanDeprecatedConnection({ provider: row.provider }),
+      row.leftover,
+      `provider=${JSON.stringify(row.provider)}`
+    );
+  }
+});
+
+test("mixed connections group only gemini-cli leftovers", () => {
+  const leftovers = listDeprecatedProviderLeftovers([
+    { id: "g1", provider: "gemini", name: "live gemini" },
+    { id: "c1", provider: "gemini-cli", name: "old cli" },
+    { id: "c2", provider: "gemini-cli", name: "old cli 2" },
+    { id: "o1", provider: "openai-compatible-foo", name: "custom" },
+  ]);
+
+  assert.equal(leftovers.length, 1);
+  assert.equal(leftovers[0]?.provider, "gemini-cli");
+  assert.equal(leftovers[0]?.migrateTo, "gemini");
+  assert.ok(leftovers[0]?.reason);
+  assert.deepEqual(leftovers[0]?.connectionIds, ["c1", "c2"]);
+  assert.deepEqual(leftovers[0]?.names, ["old cli", "old cli 2"]);
+});
diff --git a/tests/unit/deprecated-provider-route-13067.test.ts b/tests/unit/deprecated-provider-route-13067.test.ts
new file mode 100644
index 0000000000..d6409875dc
--- /dev/null
+++ b/tests/unit/deprecated-provider-route-13067.test.ts
@@ -0,0 +1,230 @@
+/**
+ * GET/POST /api/providers/deprecated leftover list and purge (#13067).
+ *
+ * Real isolated SQLite plus source-scan. Namespace mocks are not
+ * configurable under the tsx loader, so delete counts come from the
+ * live helper already covered in the by-provider cleanup test.
+ */
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import test from "node:test";
+import { fileURLToPath } from "node:url";
+
+const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-13067-route-"));
+process.env.DATA_DIR = TEST_DATA_DIR;
+process.env.DISABLE_SQLITE_AUTO_BACKUP = "true";
+process.env.API_KEY_SECRET = process.env.API_KEY_SECRET ?? "deprecated-provider-route-secret";
+delete process.env.INITIAL_PASSWORD;
+
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
+const routePath = path.join(repoRoot, "src/app/api/providers/deprecated/route.ts");
+
+const core = await import("../../src/lib/db/core.ts");
+const providersDb = await import("../../src/lib/db/providers.ts");
+const settingsDb = await import("../../src/lib/db/settings.ts");
+const compliance = await import("../../src/lib/compliance/index.ts");
+
+async function resetStorage() {
+  core.resetDbInstance();
+  for (let attempt = 0; attempt < 10; attempt++) {
+    try {
+      if (fs.existsSync(TEST_DATA_DIR)) {
+        fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 });
+      }
+      break;
+    } catch (error: unknown) {
+      const code = (error as { code?: string } | undefined)?.code;
+      if ((code === "EBUSY" || code === "EPERM") && attempt < 9) {
+        await new Promise((resolve) => setTimeout(resolve, 50 * (attempt + 1)));
+      } else {
+        throw error;
+      }
+    }
+  }
+  fs.mkdirSync(TEST_DATA_DIR, { recursive: true });
+  await settingsDb.updateSettings({ requireLogin: false });
+  delete process.env.INITIAL_PASSWORD;
+}
+
+test.beforeEach(async () => {
+  await resetStorage();
+});
+
+test.after(async () => {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 });
+});
+
+function readRouteSource() {
+  assert.ok(fs.existsSync(routePath), "deprecated provider route must exist");
+  return fs.readFileSync(routePath, "utf8");
+}
+
+function extractHandler(source: string, name: "GET" | "POST") {
+  const start = source.indexOf(`export async function ${name}`);
+  assert.ok(start >= 0, `${name} handler must exist`);
+  const next = source.indexOf("\nexport ", start + 1);
+  return next >= 0 ? source.slice(start, next) : source.slice(start);
+}
+
+async function loadRoute() {
+  return import("../../src/app/api/providers/deprecated/route.ts");
+}
+
+function makeGetRequest() {
+  return new Request("http://localhost/api/providers/deprecated", { method: "GET" });
+}
+
+function makePostRequest(body: unknown) {
+  return new Request("http://localhost/api/providers/deprecated", {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify(body),
+  });
+}
+
+async function seedConnection(provider: string, name: string) {
+  const created = await providersDb.createProviderConnection({
+    provider,
+    authType: "apikey",
+    name,
+    apiKey: `sk-test-${Math.random().toString(36).slice(2, 10)}`,
+  });
+  assert.ok(created?.id, `connection ${name} must be created`);
+  return created as { id: string; provider: string; name: string };
+}
+
+test("source-scan: GET and POST require management auth before data access", () => {
+  const source = readRouteSource();
+  assert.match(source, /from ["']@\/lib\/api\/requireManagementAuth["']/);
+
+  const getBody = extractHandler(source, "GET");
+  const postBody = extractHandler(source, "POST");
+  const getAuth = getBody.indexOf("requireManagementAuth(request)");
+  const postAuth = postBody.indexOf("requireManagementAuth(request)");
+  assert.ok(getAuth >= 0, "GET must call requireManagementAuth");
+  assert.ok(postAuth >= 0, "POST must call requireManagementAuth");
+  assert.ok(getBody.includes("if (authError) return authError"));
+  assert.ok(postBody.includes("if (authError) return authError"));
+  assert.ok(
+    getAuth < getBody.indexOf("getRawProviderConnections"),
+    "GET must authorize before listing leftovers"
+  );
+  assert.ok(
+    postAuth < postBody.indexOf("request.json()"),
+    "POST must authorize before parsing the body"
+  );
+});
+
+test("source-scan: GET projects id/provider/name via getRawProviderConnections", () => {
+  const source = readRouteSource();
+  const getBody = extractHandler(source, "GET");
+  assert.equal(getBody.includes("getProviderConnections("), false);
+  assert.equal(getBody.includes("createLazyRowProxy"), false);
+  assert.match(getBody, /getRawProviderConnections\(/);
+  assert.match(getBody, /undefined\s*,\s*undefined\s*,/);
+  for (const col of ['"id"', '"provider"', '"name"']) {
+    assert.ok(getBody.includes(col), `GET projection must include ${col}`);
+  }
+  assert.equal(
+    /decryptConnectionFields|decryptQuiet/.test(source),
+    false,
+    "must not decrypt leftover rows"
+  );
+});
+
+test("source-scan: POST latches isDeprecatedProvider before delete", () => {
+  const source = readRouteSource();
+  const postBody = extractHandler(source, "POST");
+  assert.match(postBody, /isDeprecatedProvider\(/);
+  const latch = postBody.indexOf("isDeprecatedProvider(");
+  const deleteCall = postBody.indexOf("deleteProviderConnectionsByProvider");
+  assert.ok(latch >= 0, "POST must call isDeprecatedProvider");
+  assert.ok(deleteCall >= 0, "POST must call by-provider delete");
+  assert.ok(latch < deleteCall, "latch must reject before delete");
+  assert.match(postBody, /deprecated_provider_purge/);
+});
+
+test("GET groups only gemini-cli leftovers from mixed connections", async () => {
+  await seedConnection("gemini", "live gemini");
+  await seedConnection("gemini-cli", "old cli");
+  await seedConnection("gemini-cli", "old cli 2");
+  await seedConnection("openai-compatible-foo", "custom node");
+
+  const route = await loadRoute();
+  const res = await route.GET(makeGetRequest());
+  assert.equal(res.status, 200);
+  const body = (await res.json()) as {
+    leftovers: Array<{ provider: string; migrateTo: string; connectionIds: string[] }>;
+  };
+  assert.equal(body.leftovers.length, 1);
+  assert.equal(body.leftovers[0]?.provider, "gemini-cli");
+  assert.equal(body.leftovers[0]?.migrateTo, "gemini");
+  assert.equal(body.leftovers[0]?.connectionIds.length, 2);
+});
+
+test("POST rejects custom nodes, case variants, empty, missing, and non-string", async () => {
+  const route = await loadRoute();
+  const before = await providersDb.getRawProviderConnections();
+  const payloads = [
+    { provider: "openai-compatible-x" },
+    { provider: "Gemini-CLI" },
+    { provider: "" },
+    {},
+    { provider: 12 },
+  ];
+
+  for (const payload of payloads) {
+    const res = await route.POST(makePostRequest(payload));
+    assert.equal(res.status, 400, JSON.stringify(payload));
+  }
+
+  const after = await providersDb.getRawProviderConnections();
+  assert.equal(after.length, before.length, "invalid POST must not delete rows");
+});
+
+test("POST gemini-cli with two leftover rows returns deleted:2", async () => {
+  await seedConnection("gemini-cli", "old cli");
+  await seedConnection("gemini-cli", "old cli 2");
+  await seedConnection("gemini", "live gemini");
+
+  const route = await loadRoute();
+  const res = await route.POST(makePostRequest({ provider: "gemini-cli" }));
+  assert.equal(res.status, 200);
+  const body = (await res.json()) as { deleted: number };
+  assert.equal(body.deleted, 2);
+
+  const remaining = await providersDb.getRawProviderConnections();
+  assert.equal(remaining.length, 1);
+  assert.equal(remaining[0]?.provider, "gemini");
+
+  const audits = compliance.getAuditLog({ action: "provider.credentials.revoked" });
+  assert.ok(audits.length >= 1);
+  const details = JSON.stringify(audits[0]?.details ?? audits[0]?.metadata ?? {});
+  assert.match(details, /deprecated_provider_purge/);
+});
+
+test("POST gemini-cli with zero rows returns deleted:0", async () => {
+  const route = await loadRoute();
+  const res = await route.POST(makePostRequest({ provider: "gemini-cli" }));
+  assert.equal(res.status, 200);
+  const body = (await res.json()) as { deleted: number };
+  assert.equal(body.deleted, 0);
+});
+
+test("unauthenticated GET and POST return 401/403 and do not delete", async () => {
+  await seedConnection("gemini-cli", "old cli");
+  await settingsDb.updateSettings({ requireLogin: true });
+  process.env.INITIAL_PASSWORD = "test-password-deprecated-provider";
+
+  const route = await loadRoute();
+  const getRes = await route.GET(makeGetRequest());
+  const postRes = await route.POST(makePostRequest({ provider: "gemini-cli" }));
+  assert.ok(getRes.status === 401 || getRes.status === 403, `GET status ${getRes.status}`);
+  assert.ok(postRes.status === 401 || postRes.status === 403, `POST status ${postRes.status}`);
+
+  const remaining = await providersDb.getRawProviderConnections();
+  assert.equal(remaining.length, 1);
+});