Added Health Ednpoint for Devices

Added Offline Sync for times

backend/db/schema/devices.ts

@@ -3,7 +3,7 @@ import {
     uuid,
     timestamp,
     text,
-    bigint,
+    bigint, jsonb,
 } from "drizzle-orm/pg-core"
 
 import { tenants } from "./tenants"
@@ -23,6 +23,11 @@ export const devices = pgTable("devices", {
     password: text("password"),
 
     externalId: text("externalId"),
+
+    lastSeen: timestamp("last_seen", { withTimezone: true }),
+
+    // Hier speichern wir den ganzen Payload (RSSI, Heap, IP, etc.)
+    lastDebugInfo: jsonb("last_debug_info"),
 })
 
 export type Device = typeof devices.$inferSelect