diff --git a/tests/bulk-delete.test.ts b/tests/bulk-delete.test.ts
new file mode 100644
index 00000000..6e52eca7
--- /dev/null
+++ b/tests/bulk-delete.test.ts
@@ -0,0 +1,71 @@
+import { describe, expect, test } from "bun:test";
+import { deleteSelectedMemories } from "../web/src/lib/bulk-delete";
+
+type Call = {
+  endpoint: string;
+  options: RequestInit;
+};
+
+describe("deleteSelectedMemories", () => {
+  test("deletes prompt and memory groups and reports all deleted ids", async () => {
+    const calls: Call[] = [];
+    const result = await deleteSelectedMemories(
+      ["prompt_1", "memory_1", "memory_2"],
+      async (endpoint, options) => {
+        calls.push({ endpoint, options });
+        return { success: true };
+      }
+    );
+
+    expect(result).toEqual({
+      success: true,
+      deletedIds: ["prompt_1", "memory_1", "memory_2"],
+    });
+    expect(calls.map((call) => call.endpoint)).toEqual([
+      "/api/prompts/bulk-delete",
+      "/api/memories/bulk-delete",
+    ]);
+    expect(JSON.parse(String(calls[0]!.options.body))).toEqual({
+      ids: ["prompt_1"],
+      cascade: true,
+    });
+    expect(JSON.parse(String(calls[1]!.options.body))).toEqual({
+      ids: ["memory_1", "memory_2"],
+      cascade: true,
+    });
+  });
+
+  test("stops after the first failed group instead of reporting success", async () => {
+    const calls: string[] = [];
+    const result = await deleteSelectedMemories(
+      ["prompt_1", "memory_1"],
+      async (endpoint) => {
+        calls.push(endpoint);
+        return { success: false, error: "prompt delete failed" };
+      }
+    );
+
+    expect(result).toEqual({
+      success: false,
+      deletedIds: [],
+      error: "prompt delete failed",
+    });
+    expect(calls).toEqual(["/api/prompts/bulk-delete"]);
+  });
+
+  test("preserves successful prompt deletions when the memory group fails", async () => {
+    const result = await deleteSelectedMemories(
+      ["prompt_1", "memory_1"],
+      async (endpoint) =>
+        endpoint === "/api/prompts/bulk-delete"
+          ? { success: true }
+          : { success: false, error: "memory delete failed" }
+    );
+
+    expect(result).toEqual({
+      success: false,
+      deletedIds: ["prompt_1"],
+      error: "memory delete failed",
+    });
+  });
+});
diff --git a/web/src/hooks/useMemoriesExplorer.ts b/web/src/hooks/useMemoriesExplorer.ts
index 25891376..65991f28 100644
--- a/web/src/hooks/useMemoriesExplorer.ts
+++ b/web/src/hooks/useMemoriesExplorer.ts
@@ -1,6 +1,7 @@
 import { useCallback, useRef, useState, type FormEvent } from "react";
 import { toast } from "sonner";
 import { fetchAPI } from "$lib/api";
+import { deleteSelectedMemories } from "$lib/bulk-delete";
 import { t } from "$lib/i18n";
 import type { MemoryItem, TagInfo } from "$lib/types";
 
@@ -314,23 +315,20 @@ export function useMemoriesExplorer() {
   async function bulkDelete() {
     if (selectedIds.size === 0) return;
     if (!confirm(t("confirm-bulk-delete", { count: selectedIds.size }))) return;
-    const ids = Array.from(selectedIds);
-    const promptIds = ids.filter((id) => id.startsWith("prompt_"));
-    const memoryIds = ids.filter((id) => !id.startsWith("prompt_"));
-    if (promptIds.length > 0) {
-      await fetchAPI("/api/prompts/bulk-delete", {
-        method: "POST",
-        headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ ids: promptIds, cascade: true }),
-      });
-    }
-    if (memoryIds.length > 0) {
-      await fetchAPI("/api/memories/bulk-delete", {
-        method: "POST",
-        headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ ids: memoryIds, cascade: true }),
-      });
+
+    const result = await deleteSelectedMemories(Array.from(selectedIds), fetchAPI);
+    if (!result.success) {
+      if (result.deletedIds.length > 0) {
+        const next = new Set(selectedIds);
+        for (const id of result.deletedIds) next.delete(id);
+        setSelected(next);
+        await loadMemories();
+        await loadStats();
+      }
+      toast.error(result.error || t("toast-bulk-delete-failed"));
+      return;
     }
+
     toast.success(t("toast-bulk-delete-success"));
     setSelected(new Set());
     await loadMemories();
@@ -460,4 +458,4 @@ export function useMemoriesExplorer() {
     runDeduplication,
     runMigration,
   };
-}
+}
\ No newline at end of file
diff --git a/web/src/lib/bulk-delete.ts b/web/src/lib/bulk-delete.ts
new file mode 100644
index 00000000..3172dc16
--- /dev/null
+++ b/web/src/lib/bulk-delete.ts
@@ -0,0 +1,51 @@
+export type BulkDeleteApiResult = {
+  success: boolean;
+  error?: string;
+};
+
+type BulkDeleteRequest = (
+  endpoint: string,
+  options: RequestInit
+) => Promise<BulkDeleteApiResult>;
+
+export type BulkDeleteOutcome = {
+  success: boolean;
+  deletedIds: string[];
+  error?: string;
+};
+
+export async function deleteSelectedMemories(
+  ids: string[],
+  request: BulkDeleteRequest
+): Promise<BulkDeleteOutcome> {
+  const promptIds = ids.filter((id) => id.startsWith("prompt_"));
+  const memoryIds = ids.filter((id) => !id.startsWith("prompt_"));
+  const deletedIds: string[] = [];
+
+  const groups = [
+    { endpoint: "/api/prompts/bulk-delete", ids: promptIds },
+    { endpoint: "/api/memories/bulk-delete", ids: memoryIds },
+  ];
+
+  for (const group of groups) {
+    if (group.ids.length === 0) continue;
+
+    const result = await request(group.endpoint, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ ids: group.ids, cascade: true }),
+    });
+
+    if (!result.success) {
+      return {
+        success: false,
+        deletedIds,
+        error: result.error,
+      };
+    }
+
+    deletedIds.push(...group.ids);
+  }
+
+  return { success: true, deletedIds };
+}