summary system backend implementation

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

@@ -38,6 +38,18 @@ function getDB() {
             db.exec(`ALTER TABLE projects ADD COLUMN system_prompt TEXT`); 
         } catch {}
 
+        try {
+            db.exec(`ALTER TABLE summaries ADD COLUMN project_id INTEGER REFERENCES projects(id) ON DELETE CASCADE`);
+        } catch {}
+
+        try {
+            db.exec(`ALTER TABLE summaries ADD COLUMN token_count INTEGER`);
+        } catch {}
+
+        try {
+            db.exec(`CREATE INDEX IF NOT EXISTS idx_summaries_project ON summaries(project_id)`);
+        } catch {}
+
         // Sync FTS index with any existing episodes data
         db.exec(`INSERT OR REPLACE INTO episodes_fts(rowid, user_message, ai_response) 
             SELECT id, user_message, ai_response FROM episodes`);