Wired embedding service into memory write path

packages/memory-service/src/episodic/index.js

@@ -1,5 +1,6 @@
 const {getDB} = require('../db');
-const { EPISODIC } = require('@nexusai/shared');
+const { EPISODIC, getEnv, SERVICES } = require('@nexusai/shared');
+const semantic = require('../semantic');
 
 // --Sessions --------------------------------------------------
 
@@ -43,7 +44,7 @@ function deleteSession(id) {
 
 // --Episodes --------------------------------------------------
 // Creates a new episode linked to a session, with user message, AI response, optional token count, and metadata
-function createEpisode(sessionId, userMessage, aiResponse, tokenCount = null, metadata = null) {
+async function createEpisode(sessionId, userMessage, aiResponse, tokenCount = null, metadata = null) {
   const db = getDB();
 
   // Wrap insert + session touch in a transaction — both succeed or neither does
@@ -63,7 +64,17 @@ function createEpisode(sessionId, userMessage, aiResponse, tokenCount = null, me
     return getEpisode(result.lastInsertRowid);
   });
 
-  return insert();
+  const episode= insert();
+
+  //embed ascynchronously after SQLite completes, non-blocking.  If embedding fail, the episode still saved.
+  getEpisodeEmbedding(userMessage, aiResponse)
+    .then(vector => semantic.upsertEpisode(episode.id, vector, {
+      sessionId: episode.session_id,
+      createdAt: episode.created_at
+    }))
+    .catch(err => console.error(`Failed to embed episode ${episode.id}:`, err.message));
+
+  return episode;
 }
 
 // Retrieves an episode by its ID
@@ -138,6 +149,26 @@ function parseEpisode(row) {
   };
 }
 
+/******** Embedding Helper ********/
+async function getEpisodeEmbedding(userMessage, aiResponse){
+  const url = getEnv('EMBEDDING_SERVICE_URL', SERVICES.EMBEDDING_URL);
+
+  //Combine user message and AI response for embedding
+  const text = `User: ${userMessage}\nAssistant: ${aiResponse}`;
+
+  const res = await fetch(`${url}/embed`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ text })  
+  })
+
+  if (!res.ok) {
+    throw new Error(`Embedding service error: ${res.status} ${res.statusText}`);
+  }
+  const data = await res.json();
+  return data.embedding;
+}
+
 module.exports = {
   createSession,
   getSession,