diff --git a/changelog.d/fixes/9719-combo-connection-pins.md b/changelog.d/fixes/9719-combo-connection-pins.md
new file mode 100644
index 0000000000..79c3973ee0
--- /dev/null
+++ b/changelog.d/fixes/9719-combo-connection-pins.md
@@ -0,0 +1 @@
+- fix(db): clear stale combo connection pins when provider connections are deleted (#9719)
diff --git a/src/app/api/providers/[id]/route.ts b/src/app/api/providers/[id]/route.ts
index 460c3d1c8f..c40f15448c 100644
--- a/src/app/api/providers/[id]/route.ts
+++ b/src/app/api/providers/[id]/route.ts
@@ -25,7 +25,6 @@ import {
 import { requireManagementAuth } from "@/lib/api/requireManagementAuth";
 import { isApiKeyRevealEnabled, maskStoredApiKey } from "@/lib/apiKeyExposure";
 import { cleanupProviderModelsAfterConnectionDelete } from "@/lib/db/models";
-import { cleanupComboConnectionRefs } from "@/lib/db/combos";
 import {
   refreshConnectionRateLimits,
   enableRateLimitProtection,
@@ -367,13 +366,6 @@ export async function DELETE(request: Request, { params }: { params: Promise<{ i
       console.error(`Failed to clean up models for deleted ${connection.provider} connection:`, e);
     }
 
-    // Remove stale connectionId references from combo route steps.
-    try {
-      await cleanupComboConnectionRefs(id);
-    } catch (e) {
-      console.error("Failed to clean up combo route refs for deleted connection:", e);
-    }
-
     // Auto sync to Cloud if enabled
     await syncToCloudIfEnabled();
 
diff --git a/src/lib/db/combos.ts b/src/lib/db/combos.ts
index 6cdebbd85b..7c050084cd 100644
--- a/src/lib/db/combos.ts
+++ b/src/lib/db/combos.ts
@@ -96,39 +96,60 @@ export function setActiveCombo(name: string, db = getDbInstance()): void {
  * Called after a provider connection is removed so combo routes don't carry
  * stale references.
  */
-export async function cleanupComboConnectionRefs(connectionId: string) {
+export async function cleanupComboConnectionRefs(connectionIds: string | string[]) {
+  const deletedConnectionIds = new Set(
+    (Array.isArray(connectionIds) ? connectionIds : [connectionIds]).filter(Boolean)
+  );
+
+  if (deletedConnectionIds.size === 0) return 0;
+
   const combos = await getCombos();
   let touched = 0;
+
   for (const combo of combos) {
     if (!Array.isArray(combo.models)) continue;
+
     let changed = false;
+
     const models = (combo.models as unknown as Record<string, unknown>[]).map((step) => {
       let out = step;
-      if (out.connectionId === connectionId) {
+
+      if (typeof out.connectionId === "string" && deletedConnectionIds.has(out.connectionId)) {
         const { connectionId: _, ...rest } = out;
         out = rest;
         changed = true;
       }
+
       if (Array.isArray(out.allowedConnectionIds)) {
         const filtered = out.allowedConnectionIds.filter(
-          (id: string) => id !== connectionId
+          (id) => typeof id !== "string" || !deletedConnectionIds.has(id)
         );
+
         if (filtered.length !== out.allowedConnectionIds.length) {
-          out = { ...out, allowedConnectionIds: filtered };
+          out = {
+            ...out,
+            allowedConnectionIds: filtered,
+          };
           changed = true;
         }
       }
+
       return out;
     });
+
     if (changed && typeof combo.id === "string") {
       try {
         const { id, ...rest } = combo;
-        await updateCombo(combo.id, { ...rest, models });
+        await updateCombo(combo.id, {
+          ...rest,
+          models,
+        });
         touched++;
       } catch {
         // One combo failing should not block cleanup of the rest.
       }
     }
   }
+
   return touched;
 }
diff --git a/src/lib/db/providers/deletion.ts b/src/lib/db/providers/deletion.ts
index 38848e30df..44624fb8b9 100644
--- a/src/lib/db/providers/deletion.ts
+++ b/src/lib/db/providers/deletion.ts
@@ -10,6 +10,7 @@
 
 import { getDbInstance } from "../core";
 import { backupDbFile } from "../backup";
+import { cleanupComboConnectionRefs } from "../combos";
 import {
   removeConnectionHealth,
   removeConnectionIndex,
@@ -41,6 +42,29 @@ function _deleteAccountProxyAssignments(db: DbLike, ids: string[]) {
   ).run(...ids);
 }
 
+function _selectExistingConnectionIds(db: DbLike, ids: string[]): string[] {
+  if (ids.length === 0) return [];
+
+  const placeholders = ids.map(() => "?").join(",");
+
+  return db
+    .prepare(`SELECT id FROM provider_connections WHERE id IN (${placeholders})`)
+    .all(...ids)
+    .map((row) => {
+      const record = toRecord(row);
+      return typeof record.id === "string" ? record.id : null;
+    })
+    .filter((id): id is string => id !== null);
+}
+
+async function _cleanupDeletedComboConnectionRefs(connectionIds: string | string[]): Promise<void> {
+  try {
+    await cleanupComboConnectionRefs(connectionIds);
+  } catch (error) {
+    console.error("Failed to clean up combo route refs for deleted connections:", error);
+  }
+}
+
 export async function deleteProviderConnection(id: string) {
   const db = getDbInstance() as unknown as DbLike;
   const existing = db.prepare("SELECT provider FROM provider_connections WHERE id = ?").get(id);
@@ -51,6 +75,9 @@ export async function deleteProviderConnection(id: string) {
     db.prepare("DELETE FROM quota_snapshots WHERE connection_id = ?").run(id);
     db.prepare("DELETE FROM provider_connections WHERE id = ?").run(id);
   })();
+
+  await _cleanupDeletedComboConnectionRefs(id);
+
   removeConnectionHealth(id);
   removeConnectionIndex(id);
   bumpProxyConfigGeneration();
@@ -68,25 +95,35 @@ export async function deleteProviderConnection(id: string) {
 
 export async function deleteProviderConnections(ids: string[]): Promise<number> {
   if (ids.length === 0) return 0;
+
   const db = getDbInstance() as unknown as DbLike;
+  const existingIds = _selectExistingConnectionIds(db, ids);
 
   const deletedCount = db.transaction(() => {
     const placeholders = ids.map(() => "?").join(",");
+
     db.prepare(`DELETE FROM quota_snapshots WHERE connection_id IN (${placeholders})`).run(...ids);
+
     _deleteAccountProxyAssignments(db, ids);
+
     const result = db
       .prepare(`DELETE FROM provider_connections WHERE id IN (${placeholders})`)
       .run(...ids);
+
     return result.changes ?? 0;
   })();
 
+  await _cleanupDeletedComboConnectionRefs(existingIds);
+
   for (const id of ids) {
     removeConnectionHealth(id);
     removeConnectionIndex(id);
   }
+
   backupDbFile("pre-write");
   invalidateDbCache("connections");
   invalidateReasoningRoutingRuleCache();
+
   return deletedCount;
 }
 
@@ -111,6 +148,9 @@ export async function deleteProviderConnectionsByProvider(providerId: string) {
     }
     return db.prepare("DELETE FROM provider_connections WHERE provider = ?").run(providerId);
   })();
+
+  await _cleanupDeletedComboConnectionRefs(connectionIds);
+
   for (const connectionId of connectionIds) {
     removeConnectionHealth(connectionId);
     removeConnectionIndex(connectionId);
diff --git a/tests/unit/delete-provider-connection-clears-combo-pins-8887.test.ts b/tests/unit/delete-provider-connection-clears-combo-pins-8887.test.ts
new file mode 100644
index 0000000000..b38a81c8d0
--- /dev/null
+++ b/tests/unit/delete-provider-connection-clears-combo-pins-8887.test.ts
@@ -0,0 +1,221 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-combo-pins-8887-"));
+
+process.env.DATA_DIR = TEST_DATA_DIR;
+
+const core = await import("../../src/lib/db/core.ts");
+const providersDb = await import("../../src/lib/db/providers.ts");
+const combosDb = await import("../../src/lib/db/combos.ts");
+
+type JsonRecord = Record<string, unknown>;
+
+async function resetStorage(): Promise<void> {
+  core.resetDbInstance();
+
+  for (let attempt = 0; attempt < 10; attempt++) {
+    try {
+      fs.rmSync(TEST_DATA_DIR, {
+        recursive: true,
+        force: true,
+      });
+      break;
+    } catch (error: unknown) {
+      const code =
+        error && typeof error === "object" && "code" in error
+          ? String((error as { code?: unknown }).code)
+          : "";
+
+      if ((code === "EBUSY" || code === "EPERM") && attempt < 9) {
+        await new Promise((resolve) => setTimeout(resolve, 50 * (attempt + 1)));
+        continue;
+      }
+
+      throw error;
+    }
+  }
+
+  fs.mkdirSync(TEST_DATA_DIR, {
+    recursive: true,
+  });
+}
+
+async function createConnection(provider: string, name: string): Promise<string> {
+  const connection = await providersDb.createProviderConnection({
+    provider,
+    authType: "apikey",
+    name,
+    apiKey: `test-key-${name}`,
+  });
+
+  assert.equal(typeof connection.id, "string", "provider fixture must return a connection id");
+
+  return connection.id as string;
+}
+
+async function createPinnedCombo(name: string, models: JsonRecord[]): Promise<void> {
+  await combosDb.createCombo({
+    name,
+    strategy: "priority",
+    models,
+  });
+}
+
+async function readModels(name: string): Promise<JsonRecord[]> {
+  const combo = await combosDb.getComboByName(name);
+
+  assert.ok(combo, `combo ${name} must still exist`);
+  assert.ok(Array.isArray(combo.models), `combo ${name} must retain a models array`);
+
+  return combo.models as JsonRecord[];
+}
+
+test.beforeEach(async () => {
+  await resetStorage();
+});
+
+test.after(() => {
+  core.resetDbInstance();
+
+  fs.rmSync(TEST_DATA_DIR, {
+    recursive: true,
+    force: true,
+  });
+});
+
+test("#8887: single connection delete clears only matching combo pins", async () => {
+  const doomedId = await createConnection("openai", "single-doomed");
+  const survivorId = await createConnection("openai", "single-survivor");
+
+  await createPinnedCombo("single-delete-8887", [
+    {
+      provider: "openai",
+      model: "gpt-5.6-sol",
+      connectionId: doomedId,
+      allowedConnectionIds: [doomedId, survivorId],
+    },
+    {
+      provider: "openai",
+      model: "gpt-5.6-sol",
+      connectionId: survivorId,
+    },
+  ]);
+
+  assert.equal(await providersDb.deleteProviderConnection(doomedId), true);
+
+  const models = await readModels("single-delete-8887");
+
+  assert.equal(
+    "connectionId" in models[0],
+    false,
+    "single delete must remove the deleted direct connection pin"
+  );
+  assert.deepEqual(
+    models[0].allowedConnectionIds,
+    [survivorId],
+    "single delete must remove the deleted id from allowedConnectionIds"
+  );
+  assert.equal(
+    models[1].connectionId,
+    survivorId,
+    "single delete must preserve surviving connection pins"
+  );
+});
+
+test("#8887: bulk connection delete clears every matching combo pin", async () => {
+  const doomedA = await createConnection("anthropic", "bulk-doomed-a");
+  const doomedB = await createConnection("anthropic", "bulk-doomed-b");
+  const survivorId = await createConnection("anthropic", "bulk-survivor");
+
+  await createPinnedCombo("bulk-delete-8887", [
+    {
+      provider: "anthropic",
+      model: "claude-sonnet-5",
+      connectionId: doomedA,
+      allowedConnectionIds: [doomedA, survivorId],
+    },
+    {
+      provider: "anthropic",
+      model: "claude-sonnet-5",
+      connectionId: doomedB,
+      allowedConnectionIds: [doomedB, survivorId],
+    },
+    {
+      provider: "anthropic",
+      model: "claude-sonnet-5",
+      connectionId: survivorId,
+    },
+  ]);
+
+  assert.equal(await providersDb.deleteProviderConnections([doomedA, doomedB]), 2);
+
+  const models = await readModels("bulk-delete-8887");
+
+  assert.equal(
+    "connectionId" in models[0],
+    false,
+    "bulk delete must remove the first deleted direct pin"
+  );
+  assert.equal(
+    "connectionId" in models[1],
+    false,
+    "bulk delete must remove the second deleted direct pin"
+  );
+  assert.deepEqual(models[0].allowedConnectionIds, [survivorId]);
+  assert.deepEqual(models[1].allowedConnectionIds, [survivorId]);
+  assert.equal(models[2].connectionId, survivorId);
+});
+
+test("#8887: provider-wide delete clears that provider's combo pins only", async () => {
+  const doomedA = await createConnection("nvidia", "provider-doomed-a");
+  const doomedB = await createConnection("nvidia", "provider-doomed-b");
+  const otherProviderId = await createConnection("cerebras", "provider-survivor");
+
+  await createPinnedCombo("provider-delete-8887", [
+    {
+      provider: "nvidia",
+      model: "z-ai/glm-5.2",
+      connectionId: doomedA,
+      allowedConnectionIds: [doomedA, doomedB, otherProviderId],
+    },
+    {
+      provider: "nvidia",
+      model: "deepseek-ai/deepseek-v4-pro",
+      connectionId: doomedB,
+    },
+    {
+      provider: "cerebras",
+      model: "zai-glm-4.7",
+      connectionId: otherProviderId,
+    },
+  ]);
+
+  assert.equal(await providersDb.deleteProviderConnectionsByProvider("nvidia"), 2);
+
+  const models = await readModels("provider-delete-8887");
+
+  assert.equal(
+    "connectionId" in models[0],
+    false,
+    "provider delete must remove its first deleted direct pin"
+  );
+  assert.equal(
+    "connectionId" in models[1],
+    false,
+    "provider delete must remove its second deleted direct pin"
+  );
+  assert.deepEqual(
+    models[0].allowedConnectionIds,
+    [otherProviderId],
+    "provider delete must preserve ids belonging to other providers"
+  );
+  assert.equal(
+    models[2].connectionId,
+    otherProviderId,
+    "provider delete must preserve another provider's direct pin"
+  );
+});