feature: Corrections and Supersession

VigilCareRecordsAPI/Domain/Entities/LiveEncounter.cs

@@ -0,0 +1,14 @@
+public class LiveEncounter
+{
+    public Guid Id { get; set; }
+    public Guid PatientId { get; set; }
+    public DateTimeOffset AdmissionDate { get; set; }
+    public Department? Department { get; set; }
+    public string? RoomBed { get; set; }
+    public string? AdmissionReason { get; set; }
+    public string? DischargeDiagnosis { get; set; }
+    public string Status { get; set; } = "active";
+    public DateTimeOffset CreatedAt { get; set; }
+
+    public ICollection<LiveObservation> Observations { get; set; } = new List<LiveObservation>();
+}

VigilCareRecordsAPI/Domain/Entities/LiveObservation.cs

@@ -0,0 +1,20 @@
+public class LiveObservation
+{
+    public Guid Id { get; set; }
+    public Guid EncounterId { get; set; }
+    public Guid? PatientId { get; set; }
+    public Guid SourceBatchId { get; set; }
+    public string ObservationCode { get; set; } = null!;
+    public decimal Value { get; set; }
+    public string Unit { get; set; } = null!;
+    public DateTimeOffset RecordedAt { get; set; }
+    public string? Note { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+
+    // Phase 5: Supersession fields
+    public bool IsSuperseded { get; set; }
+    public Guid? SupersededByBatchId { get; set; }
+    public DateTimeOffset? SupersededAt { get; set; }
+
+    public LiveEncounter Encounter { get; set; } = null!;
+}