Initial commit

src/PowderCoating.Core/Entities/Announcement.cs

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+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// Platform-wide announcements shown as dismissible banners to company users.
+/// Not a BaseEntity — SuperAdmin-managed, not per-tenant.
+/// </summary>
+public class Announcement
+{
+    public int Id { get; set; }
+    public string Title { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+
+    /// <summary>info | success | warning | danger</summary>
+    public string Type { get; set; } = "info";
+
+    /// <summary>All | Plan | Company</summary>
+    public string Target { get; set; } = "All";
+
+    /// <summary>Populated when Target == "Plan" (matches Company.SubscriptionPlan int)</summary>
+    public int? TargetPlan { get; set; }
+
+    /// <summary>Populated when Target == "Company"</summary>
+    public int? TargetCompanyId { get; set; }
+
+    public DateTime StartsAt { get; set; } = DateTime.UtcNow;
+    public DateTime? ExpiresAt { get; set; }
+    public bool IsDismissible { get; set; } = true;
+    public bool IsActive { get; set; } = true;
+    public string CreatedByUserId { get; set; } = string.Empty;
+    public string CreatedByUserName { get; set; } = string.Empty;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? UpdatedAt { get; set; }
+
+    public virtual ICollection<AnnouncementDismissal> Dismissals { get; set; } = new List<AnnouncementDismissal>();
+}
+
+/// <summary>
+/// Records that a specific user has dismissed a specific announcement.
+/// </summary>
+public class AnnouncementDismissal
+{
+    public int Id { get; set; }
+    public int AnnouncementId { get; set; }
+    public string UserId { get; set; } = string.Empty;
+    public DateTime DismissedAt { get; set; } = DateTime.UtcNow;
+
+    public virtual Announcement Announcement { get; set; } = null!;
+}