diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ad765382..9f0af3e7c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,13 +10,13 @@ Docs: https://docs.clawd.bot
 - Swabble: use the tagged Commander Swift package release.
 - CLI: add `clawdbot acp client` interactive ACP harness for debugging.
 - Plugins: route command detection/text chunking helpers through the plugin runtime and drop runtime exports from the SDK.
-- Memory: add native Gemini embeddings provider for memory search. (#1151) — thanks @steipete.
+- Memory: add native Gemini embeddings provider for memory search. (#1151)
 
 ### Fixes
 - Auth profiles: keep auto-pinned preference while allowing rotation on failover; user pins stay locked. (#1138) — thanks @cheeeee.
 - macOS: avoid touching launchd in Remote over SSH so quitting the app no longer disables the remote gateway. (#1105)
-- Memory: index atomically so failed reindex preserves the previous memory database. (#1151) — thanks @steipete.
-- Memory: avoid sqlite-vec unique constraint failures when reindexing duplicate chunk ids. (#1151) — thanks @steipete.
+- Memory: index atomically so failed reindex preserves the previous memory database. (#1151)
+- Memory: avoid sqlite-vec unique constraint failures when reindexing duplicate chunk ids. (#1151)
 
 ## 2026.1.18-3
 
diff --git a/src/memory/manager.vector-dedupe.test.ts b/src/memory/manager.vector-dedupe.test.ts
new file mode 100644
index 000000000..936bb8410
--- /dev/null
+++ b/src/memory/manager.vector-dedupe.test.ts
@@ -0,0 +1,93 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { getMemorySearchManager, type MemoryIndexManager } from "./index.js";
+import { buildFileEntry } from "./internal.js";
+
+vi.mock("./embeddings.js", () => {
+  return {
+    createEmbeddingProvider: async () => ({
+      requestedProvider: "openai",
+      provider: {
+        id: "mock",
+        model: "mock-embed",
+        embedQuery: async () => [0.1, 0.2, 0.3],
+        embedBatch: async (texts: string[]) => texts.map((_, index) => [index + 1, 0, 0]),
+      },
+    }),
+  };
+});
+
+describe("memory vector dedupe", () => {
+  let workspaceDir: string;
+  let indexPath: string;
+  let manager: MemoryIndexManager | null = null;
+
+  beforeEach(async () => {
+    workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-mem-"));
+    indexPath = path.join(workspaceDir, "index.sqlite");
+    await fs.mkdir(path.join(workspaceDir, "memory"));
+    await fs.writeFile(path.join(workspaceDir, "MEMORY.md"), "Hello memory.");
+  });
+
+  afterEach(async () => {
+    if (manager) {
+      await manager.close();
+      manager = null;
+    }
+    await fs.rm(workspaceDir, { recursive: true, force: true });
+  });
+
+  it("deletes existing vector rows before inserting replacements", async () => {
+    const cfg = {
+      agents: {
+        defaults: {
+          workspace: workspaceDir,
+          memorySearch: {
+            provider: "openai",
+            model: "mock-embed",
+            store: { path: indexPath, vector: { enabled: true } },
+            sync: { watch: false, onSessionStart: false, onSearch: false },
+            cache: { enabled: false },
+          },
+        },
+        list: [{ id: "main", default: true }],
+      },
+    };
+
+    const result = await getMemorySearchManager({ cfg, agentId: "main" });
+    expect(result.manager).not.toBeNull();
+    if (!result.manager) throw new Error("manager missing");
+    manager = result.manager;
+
+    const db = (manager as unknown as { db: { exec: (sql: string) => void; prepare: (sql: string) => unknown } }).db;
+    db.exec("CREATE TABLE IF NOT EXISTS chunks_vec (id TEXT PRIMARY KEY, embedding BLOB)");
+
+    const sqlSeen: string[] = [];
+    const originalPrepare = db.prepare.bind(db);
+    db.prepare = (sql: string) => {
+      if (sql.includes("chunks_vec")) {
+        sqlSeen.push(sql);
+      }
+      return originalPrepare(sql);
+    };
+
+    (manager as unknown as { ensureVectorReady: (dims?: number) => Promise<boolean> }).ensureVectorReady =
+      async () => true;
+
+    const entry = await buildFileEntry(path.join(workspaceDir, "MEMORY.md"), workspaceDir);
+    await (manager as unknown as { indexFile: (entry: unknown, options: { source: "memory" }) => Promise<void> }).indexFile(
+      entry,
+      { source: "memory" },
+    );
+
+    const deleteIndex = sqlSeen.findIndex((sql) => sql.includes("DELETE FROM chunks_vec WHERE id = ?"));
+    const insertIndex = sqlSeen.findIndex((sql) => sql.includes("INSERT INTO chunks_vec"));
+    expect(deleteIndex).toBeGreaterThan(-1);
+    expect(insertIndex).toBeGreaterThan(-1);
+    expect(deleteIndex).toBeLessThan(insertIndex);
+  });
+});