PCIRCLE-AI · kevintseng · Sep 30, 2026 · Sep 30, 2026 · Sep 30, 2026 · Sep 30, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,7 @@ All notable changes to MeMesh are documented here.
 
 ### Fixed
 
+- Importing with `overwrite` (MCP `import`, `POST /v1/import`, `memesh import --merge overwrite`) now keeps the memory's previous observations, tags and title in its `replaced_history`, the same way `remember` with `replace: true` does. Before, the old content was erased with no way back. Importing a file that names one memory more than once is refused before anything is written (#530).
 - A message sent through the MCP `message` tool keeps every `null` in its JSON payload. Before, the MCP boundary removed each null-valued key at any depth of the payload while `send` still reported success, so the recipient got different data than the CLI or HTTP would have stored (#517). A null-valued top-level tool parameter still means "left blank", except `payload`, whose null is a value (#553).
 - The MCP `message` tool accepts `payload: null` on `send`, as its schema and the HTTP API already did; it was refused with `payload: Invalid input` (#553).
 

diff --git a/dist/core/operations.d.ts b/dist/core/operations.d.ts
@@ -1,15 +1,7 @@
 import { type RecallForAgentResult } from './recall-agent-view.js';
 import type { RememberInput, RememberResult, RecallInput, ForgetInput, ForgetResult, LearnInput, LearnResult, Entity } from './types.js';
+export { REPLACED_HISTORY_MAX, REPLACED_HISTORY_MAX_BYTES, type ReplacedVersion } from './replaced-history.js';
 export declare function remember(input: RememberInput): RememberResult;
-export declare const REPLACED_HISTORY_MAX = 20;
-export declare const REPLACED_HISTORY_MAX_BYTES: number;
-export interface ReplacedVersion {
-    replaced_at: string;
-    title: string | null;
-    observations: string[];
-    tags: string[];
-    truncated?: boolean;
-}
 export declare function recall(args: RecallInput): Entity[];
 export interface RetrievalMeta {
     mode: 'fts';

diff --git a/dist/core/operations.d.ts.map b/dist/core/operations.d.ts.map
diff --git a/dist/core/operations.js b/dist/core/operations.js
diff --git a/dist/core/operations.js.map b/dist/core/operations.js.map
diff --git a/dist/core/replaced-history.d.ts b/dist/core/replaced-history.d.ts
@@ -0,0 +1,11 @@
+export interface ReplacedVersion {
+    replaced_at: string;
+    title: string | null;
+    observations: string[];
+    tags: string[];
+    truncated?: boolean;
+}
+export declare const REPLACED_HISTORY_MAX = 20;
+export declare const REPLACED_HISTORY_MAX_BYTES: number;
+export declare function boundReplacedHistory(history: ReplacedVersion[]): ReplacedVersion[];
+//# sourceMappingURL=replaced-history.d.ts.map
diff --git a/dist/core/replaced-history.d.ts.map b/dist/core/replaced-history.d.ts.map
diff --git a/dist/core/replaced-history.js b/dist/core/replaced-history.js
diff --git a/dist/core/replaced-history.js.map b/dist/core/replaced-history.js.map
diff --git a/dist/core/schema-export.js b/dist/core/schema-export.js
diff --git a/dist/core/schema-export.js.map b/dist/core/schema-export.js.map
diff --git a/dist/core/serializer.d.ts.map b/dist/core/serializer.d.ts.map
diff --git a/dist/core/serializer.js b/dist/core/serializer.js