consolidation and aging

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

@@ -1,5 +1,5 @@
 const {getDB} = require('../db');
-const { EPISODIC, getEnv, SERVICES, parseRow, formatEpisodeText, SUMMARIES, logger, isTrivialTurn } = require('@nexusai/shared');
+const { EPISODIC, getEnv, SERVICES, parseRow, formatEpisodeText, SUMMARIES, logger, isTrivialTurn, CONSOLIDATION } = require('@nexusai/shared');
 const semantic = require('../semantic');
 const { extractAndStoreEntities } = require('../entities/extraction')
 
@@ -311,6 +311,22 @@ function getEpisodesByProject(projectId, limit = SUMMARIES.MAX_PROJECT_EPISODE_L
     `).all(projectId, limit).map(parseRow);
 }
 
+function getConsolidationCandidates(sessionId, limit = CONSOLIDATION.CANDIDATE_LIMIT) {
+    const db = getDB();
+    const now = Date.now();
+    const cutoff = Math.floor(now / 1000) - CONSOLIDATION.MIN_AGE_DAYS *86400 // seconds, so it matches created_at
+
+    return db.prepare(`
+        SELECT id, access_count, created_at, last_accessed_at,
+              SUBSTR(user_message, 1, 80) AS preview,
+              CAST( access_count AS REAL) / (1+(?-COALESCE(last_accessed_at, created_at * 1000)) / 86400000.0) AS aging_score
+              FROM episodes
+              WHERE session_id = ? AND created_at < ?
+              ORDER BY aging_score ASC
+              LIMIT ?
+      `).all(now, sessionId, cutoff, limit);
+}
+
 module.exports = {
   createSession,
   getSession,
@@ -331,4 +347,5 @@ module.exports = {
   touchEpisodes,
   getEpisodesByProject,
   buildFtsQuery,
+  getConsolidationCandidates,
 };