retrieval fusion

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

@@ -168,17 +168,26 @@ function getRecentEpisodes(sessionId, limit = EPISODIC.DEFAULT_RECENT_LIMIT) {
 
 
 // Searches episodes using FTS5 full-text search, ordered by relevance, with a limit
-function searchEpisodes(query, limit = EPISODIC.DEFAULT_SEARCH_LIMIT) {
-  // FTS5 full-text search across all episodes
+function searchEpisodes(query, limit = EPISODIC.DEFAULT_SEARCH_LIMIT, sessionIds = null) {
   const db = getDB();
-  const stmt = db.prepare(`
+  if (sessionIds && sessionIds.length > 0) {
+    const ph = sessionIds.map(() => '?').join(',');
+    return db.prepare(`
+      SELECT e.* FROM episodes e
+      JOIN episodes_fts fts ON e.id = fts.rowid
+      WHERE episodes_fts MATCH ?
+      AND e.session_id IN (${ph})
+      ORDER BY rank
+      LIMIT ?
+    `).all(query, ...sessionIds, limit).map(parseRow);
+  }
+  return db.prepare(`
     SELECT e.* FROM episodes e
     JOIN episodes_fts fts ON e.id = fts.rowid
     WHERE episodes_fts MATCH ?
     ORDER BY rank
     LIMIT ?
-  `);
-  return stmt.all(query, limit).map(parseRow);
+  `).all(query, limit).map(parseRow);
 }
 
 // Deletes an episode by its ID

packages/memory-service/src/index.js

@@ -131,10 +131,12 @@ app.get('/episodes', (req, res) => {
 
 // Search MUST come before /:id — otherwise 'search' gets captured as an id
 app.get('/episodes/search', (req, res) => {
-  const { q, limit = EPISODIC.DEFAULT_PAGE_SIZE } = req.query;
+  const { q, limit = EPISODIC.DEFAULT_PAGE_SIZE, sessionIds } = req.query;
   if (!q) return res.status(400).json({ error: 'q (query) parameter is required' });
-  const results = episodic.searchEpisodes(q, Number(limit));
-  res.json(results);
+  const parsedSessionIds = sessionIds
+    ? sessionIds.split(',').map(Number).filter(Boolean)
+    : null;
+  res.json(episodic.searchEpisodes(q, Number(limit), parsedSessionIds));
 });
 
 app.get('/episodes/:id', (req, res) => {

packages/shared/src/config/constants.js

@@ -96,6 +96,12 @@ const ENTITIES = {
     ],
 }
 
+const RETRIEVAL = {
+    RRF_K:              60,     // Reciprocal Rank Fusion smoothing constant, softens rank-1 advantage, not exposed in settings
+    SEMANTIC_WEIGHT:    1.0,    // Weight applied to semantic (QDrant) results
+    KEYWORD_WEIGHT:     0,    // Weight applied to keyword (SQLite) results, 0 = disables, set >0 to enable and tune balance between semantic vs keyword matches
+}
+
 module.exports = {
     QDRANT,
     COLLECTIONS,
@@ -108,5 +114,6 @@ module.exports = {
     SQLITE,
     ORCHESTRATION,
     SUMMARIES,
-    ENTITIES
+    ENTITIES,
+    RETRIEVAL,
 };

packages/shared/src/index.js

@@ -1,5 +1,5 @@
 const {getEnv} = require('./config/env');
-const {QDRANT, COLLECTIONS, EPISODIC, SERVICES, OLLAMA, PORTS, LLAMACPP, INFERENCE_DEFAULTS, SQLITE, ORCHESTRATION, SUMMARIES, ENTITIES } = require('./config/constants');
+const {QDRANT, COLLECTIONS, EPISODIC, SERVICES, OLLAMA, PORTS, LLAMACPP, INFERENCE_DEFAULTS, SQLITE, ORCHESTRATION, SUMMARIES, ENTITIES, RETRIEVAL } = require('./config/constants');
 const {parseRow, formatEpisodeText} = require('./utils')
 const logger = require('./utils/logger');
 
@@ -20,4 +20,5 @@ module.exports = {
     SUMMARIES,
     ENTITIES,
     logger,
+    RETRIEVAL,
 };