set SetMaxOpenConns, close rows when QueryEvents finishes

storage/postgresql/init.go

@@ -12,6 +12,9 @@ func (b *PostgresBackend) Init() error {
 		return err
 	}
 
+	// sqlx default is 0 (unlimited), while postgresql by default accepts up to 100 connections
+	db.SetMaxOpenConns(80)
+
 	db.Mapper = reflectx.NewMapperFunc("json", sqlx.NameMapper)
 	b.DB = db
 

storage/postgresql/query.go

@@ -139,6 +139,8 @@ func (b PostgresBackend) QueryEvents(filter *nostr.Filter) (events []nostr.Event
 		return nil, fmt.Errorf("failed to fetch events using query %q: %w", query, err)
 	}
 
+	defer rows.Close()
+
 	for rows.Next() {
 		var evt nostr.Event
 		var timestamp int64