initial commit

backend/Domain/Entities/Printer.cs

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+using Extrudex.Domain.Base;
+using Extrudex.Domain.Enums;
+
+namespace Extrudex.Domain.Entities;
+
+/// <summary>
+/// Represents a 3D printer in the fleet. Stores connection details for
+/// MQTT (Bambu Lab) or Moonraker (Elegoo Centauri Carbon) integration.
+/// </summary>
+public class Printer : AuditableEntity
+{
+    /// <summary>
+    /// Current operational status of the printer, updated via real-time telemetry.
+    /// </summary>
+    public PrinterStatus Status { get; set; } = PrinterStatus.Offline;
+
+    /// <summary>
+    /// Human-readable name for the printer (e.g., "Bambu X1C #1", "Elegoo Centauri").
+    /// </summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Manufacturer/brand of the printer (e.g., "Bambu Lab", "Elegoo").
+    /// </summary>
+    public string Manufacturer { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Model name (e.g., "X1 Carbon", "Centauri Carbon").
+    /// </summary>
+    public string Model { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The hardware type of the printer (FDM or Resin).
+    /// </summary>
+    public PrinterType PrinterType { get; set; } = PrinterType.Fdm;
+
+    /// <summary>
+    /// The connectivity protocol used by this printer (MQTT or Moonraker).
+    /// </summary>
+    public ConnectionType ConnectionType { get; set; } = ConnectionType.Mqtt;
+
+    /// <summary>
+    /// Hostname or IP address for connecting to the printer.
+    /// </summary>
+    public string HostnameOrIp { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Port number for the printer connection. Defaults: 8883 (MQTT/TLS), 7125 (Moonraker).
+    /// </summary>
+    public int Port { get; set; }
+
+    /// <summary>
+    /// MQTT username for Bambu Lab printer authentication.
+    /// Stored only for MQTT connection type printers.
+    /// </summary>
+    public string MqttUsername { get; set; } = string.Empty;
+
+    /// <summary>
+    /// MQTT password for Bambu Lab printer authentication.
+    /// Stored only for MQTT connection type printers.
+    /// </summary>
+    public string MqttPassword { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Whether to use TLS for the MQTT connection. Bambu Lab printers
+    /// require TLS on port 8883.
+    /// </summary>
+    public bool MqttUseTls { get; set; }
+
+    /// <summary>
+    /// Moonraker API key for Elegoo Centauri Carbon authentication.
+    /// Stored only for Moonraker connection type printers.
+    /// </summary>
+    public string ApiKey { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Whether this printer is currently active and available for print jobs.
+    /// Inactive printers are retained for historical records.
+    /// </summary>
+    public bool IsActive { get; set; } = true;
+
+    /// <summary>
+    /// Timestamp of the last status update received from the printer (UTC).
+    /// Used to detect stale connections.
+    /// </summary>
+    public DateTime? LastSeenAt { get; set; }
+
+    /// <summary>
+    /// Navigation collection of AMS units installed on this printer.
+    /// </summary>
+    public ICollection<AmsUnit> AmsUnits { get; set; } = new List<AmsUnit>();
+
+    /// <summary>
+    /// Navigation collection of print jobs executed on this printer.
+    /// </summary>
+    public ICollection<PrintJob> PrintJobs { get; set; } = new List<PrintJob>();
+}