Add in-memory caching strategy for aggregated queries with TTL and automatic invalidation on data changes

server/database.js

@@ -100,6 +100,10 @@ try {
   db.prepare("ALTER TABLE resources ADD COLUMN sla_target REAL DEFAULT 99.9").run();
 } catch (err) {}
 
+try {
+  db.prepare("ALTER TABLE resources ADD COLUMN email_to TEXT").run();
+} catch (err) {}
+
 try {
   db.prepare("ALTER TABLE incidents ADD COLUMN acknowledged INTEGER DEFAULT 0").run();
 } catch (err) {}