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src/PowderCoating.Core/Entities/AiUsageLog.cs

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+namespace PowderCoating.Core.Entities;
+
+/// <summary>
+/// Immutable audit log of every Anthropic API call made on behalf of a tenant.
+/// Intentionally omits BaseEntity — no soft delete, no UpdatedAt, no per-tenant query filter
+/// (this is a platform-wide log read by SuperAdmins across all companies).
+/// </summary>
+public class AiUsageLog
+{
+    public long Id { get; set; }
+    public int CompanyId { get; set; }
+    public string UserId { get; set; } = string.Empty;
+
+    /// <summary>Which AI feature triggered this call. Use AppConstants.AiFeatures constants.</summary>
+    public string Feature { get; set; } = string.Empty;
+
+    /// <summary>True when the AI service returned successfully; false on exception or upstream error.</summary>
+    public bool Success { get; set; } = true;
+
+    /// <summary>Approximate input size in characters/bytes — used as a rough token-cost proxy.</summary>
+    public int InputLength { get; set; }
+
+    public DateTime CalledAt { get; set; }
+
+    public Company? Company { get; set; }
+}