feat(sdk): add delete_linked option to MemoryClient.delete (Python + TS)

Plumbs the platform v3 `delete_linked` flag through the hosted MemoryClient in
both SDKs. When true, DELETE /v1/memories/{id}/ also removes the older memories
the target superseded (the linked_memory_ids chain) — the delete-side counterpart
of `latest_only`, so a superseded memory doesn't resurface after the current one
is deleted.

- Python: MemoryClient.delete / AsyncMemoryClient.delete gain `delete_linked: bool = False`
  forwarded as a query param (omitted when False — default byte-identical).
- TypeScript: client.delete accepts `{ deleteLinked?: boolean }`, serialized to
  `delete_linked` via the existing camelToSnakeKeys path (matches latestOnly).
- Unit tests for both: default omits the param; opt-in forwards it.

Client-side passthrough only; no changes to the OSS memory engine.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mem0-ts/src/client/mem0.ts

@@ -9,6 +9,7 @@ import {
   SearchMemoryOptions,
   GetAllMemoryOptions,
   DeleteAllMemoryOptions,
+  DeleteMemoryOptions,
   MemoryUpdateBody,
   ProjectResponse,
   PromptUpdatePayload,
@@ -377,11 +378,17 @@ export default class MemoryClient {
     return response;
   }
 
-  async delete(memoryId: string): Promise<{ message: string }> {
+  async delete(
+    memoryId: string,
+    options: DeleteMemoryOptions = {},
+  ): Promise<{ message: string }> {
     if (this.telemetryId === "") await this.ping();
-    this._captureEvent("delete", []);
+    this._captureEvent("delete", [Object.keys(options || {})]);
+    const snakeOptions = camelToSnakeKeys(this._prepareParams(options));
+    // @ts-ignore
+    const query = new URLSearchParams(snakeOptions).toString();
     return this._fetchWithErrorHandling(
-      `${this.host}/v1/memories/${memoryId}/`,
+      `${this.host}/v1/memories/${memoryId}/${query ? `?${query}` : ""}`,
       {
         method: "DELETE",
         headers: this.headers,

mem0-ts/src/client/mem0.types.ts

@@ -39,6 +39,14 @@ export interface GetAllMemoryOptions {
 
 export interface DeleteAllMemoryOptions extends EntityOptions {}
 
+export interface DeleteMemoryOptions {
+  // When true, also delete the older memories this one superseded
+  // (the v3 linked_memory_ids chain), transitively. The delete-side
+  // counterpart of latestOnly — stops a superseded memory from resurfacing
+  // after the current one is deleted. Serialized as `delete_linked`.
+  deleteLinked?: boolean;
+}
+
 // ─── Project Options ────────────────────────────────────────
 export interface ProjectOptions {
   fields?: string[];

mem0-ts/src/client/tests/memoryClient.crud.test.ts

@@ -200,9 +200,26 @@ describe("MemoryClient - delete()", () => {
     const client = new MemoryClient({ apiKey: TEST_API_KEY });
     await client.delete("mem_123");
 
-    expect(
-      findFetchCall(mock, "/v1/memories/mem_123/", "DELETE"),
-    ).toBeDefined();
+    const call = findFetchCall(mock, "/v1/memories/mem_123/", "DELETE");
+    expect(call).toBeDefined();
+    // Default: no cascade query param, URL byte-identical to before.
+    expect(call![0]).not.toContain("delete_linked");
+  });
+
+  test("serializes deleteLinked as delete_linked query param", async () => {
+    const extra = new Map<string, { status: number; body: unknown }>();
+    extra.set("/v1/memories/mem_123/", {
+      status: 200,
+      body: { message: "Memory deleted successfully", cascade_count: 1 },
+    });
+    const mock = setupMockFetch(extra);
+
+    const client = new MemoryClient({ apiKey: TEST_API_KEY });
+    await client.delete("mem_123", { deleteLinked: true });
+
+    const call = findFetchCall(mock, "/v1/memories/mem_123/", "DELETE");
+    expect(call).toBeDefined();
+    expect(call![0]).toContain("delete_linked=true");
   });
 });