collect uptime telemetry added in meshtastic v2.3.5

prisma/migrations/20240416042356_add_uptime_seconds_column_to_nodes_table/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE `nodes` ADD COLUMN `uptime_seconds` BIGINT NULL;

prisma/schema.prisma

@@ -38,6 +38,7 @@ model Node {
   voltage             Decimal?
   channel_utilization Decimal?
   air_util_tx         Decimal?
+  uptime_seconds      BigInt?
 
   neighbour_broadcast_interval_secs Int?
   neighbours                        Json?