added httpget for id

Watcher/Controllers/MonitoringController.cs

@@ -94,7 +94,7 @@ public class MonitoringController : Controller
 
 
     // Endpoint, an dem sich neue Agents registrieren
-    [HttpPost("register")]
+    [HttpPost("register-agent-by-id")]
     public async Task<IActionResult> Register([FromBody] RegistrationDto dto)
     {
         // Gültigkeit des Payloads prüfen
@@ -134,6 +134,22 @@ public class MonitoringController : Controller
 
     }
 
+    [HttpGet("server-id-by-ip")]
+    public async Task<IActionResult> GetServerIdByIp([FromQuery] string ipAddress)
+    {
+        var server = await _context.Servers
+            .FirstOrDefaultAsync(s => s.IPAddress == ipAddress);
+
+        if (server == null)
+            return NotFound();
+
+        return Ok(new
+        {
+            id = server.Id,
+            ipAddress = server.IPAddress
+        });
+    }
+
 
     // Enpoint, an den Agents Ihre gesammelten Daten senden
     [HttpPost("metric")]