fts tokenization fix

nexusai-fts-tokenizing.patch

@@ -1,69 +0,0 @@
-diff -ruN nexusai-baseline/packages/memory-service/src/episodic/index.js nexusai/packages/memory-service/src/episodic/index.js
---- nexusai-baseline/packages/memory-service/src/episodic/index.js	2026-08-17 08:00:53.663975458 +0000
-+++ nexusai/packages/memory-service/src/episodic/index.js	2026-08-17 08:02:22.352734961 +0000
-@@ -3,6 +3,36 @@
- const semantic = require('../semantic');
- const { extractAndStoreEntities } = require('../entities/extraction')
- 
-+// Common English function words that add noise to keyword matching. Kept short
-+// on purpose — FTS5's BM25 ranking already down-weights frequent terms; this is
-+// mainly to stop an all-stopword query ("how do I do this") from matching everything.
-+const FTS_STOPWORDS = new Set([
-+  'the','a','an','and','or','but','if','then','of','to','in','on','at','for',
-+  'with','is','are','was','were','be','been','being','do','does','did','how',
-+  'what','why','when','where','who','which','this','that','these','those',
-+  'i','you','it','we','they','me','my','your','can','could','would','should',
-+  'will','about','as','by','from','so','just','get','got','have','has','had',
-+]);
-+
-+// Turn a free-text message into an FTS5 MATCH expression. The message is tokenized
-+// into significant terms, each wrapped in quotes (so any FTS5-significant token in
-+// the message — e.g. a literal "OR" or "*" — is treated as a search term, not an
-+// operator), and the terms are OR-joined for recall. Returns null when nothing
-+// usable remains, so the caller can skip keyword search rather than run a
-+// degenerate query.
-+//
-+// This replaces the previous behaviour of quoting the ENTIRE message as one phrase,
-+// which required the whole message to appear verbatim and made keyword recall ~nil.
-+function buildFtsQuery(query) {
-+  const tokens = query
-+    .toLowerCase()
-+    .split(/[^\p{L}\p{N}]+/u)              // split on any non-letter/number, unicode-aware
-+    .filter(t => t.length >= 2 && !FTS_STOPWORDS.has(t));
-+
-+  if (tokens.length === 0) return null;
-+  return tokens.map(t => `"${t}"`).join(' OR ');
-+}
-+
- // --Sessions --------------------------------------------------
- 
- // Creates a new session with the given external ID and optional metadata
-@@ -199,7 +229,9 @@
- // Searches episodes using FTS5 full-text search, ordered by relevance, with a limit
- function searchEpisodes(query, limit = EPISODIC.DEFAULT_SEARCH_LIMIT, sessionIds = null) {
-   const db = getDB();
--  const safeQuery = `"${query.replace(/"/g, '""')}"`;
-+  const match = buildFtsQuery(query);
-+  if (!match) return [];   // no usable keyword terms — let semantic retrieval carry this turn
-+
-   if (sessionIds && sessionIds.length > 0) {
-     const ph = sessionIds.map(() => '?').join(',');
-     return db.prepare(`
-@@ -209,7 +241,7 @@
-       AND e.session_id IN (${ph})
-       ORDER BY rank
-       LIMIT ?
--    `).all(safeQuery, ...sessionIds, limit).map(parseRow);
-+    `).all(match, ...sessionIds, limit).map(parseRow);
-   }
-   return db.prepare(`
-     SELECT e.* FROM episodes e
-@@ -217,7 +249,7 @@
-     WHERE episodes_fts MATCH ?
-     ORDER BY rank
-     LIMIT ?
--  `).all(safeQuery, limit).map(parseRow);
-+  `).all(match, limit).map(parseRow);
- }
- 
- // Deletes an episode by its ID