feature: FHIR R4 Inbound Facade

VigilCareClinicalAPI/Domains/Entities/ExternalResourceIdentifier.cs

@@ -0,0 +1,9 @@
+public class ExternalResourceIdentifier
+{
+    public Guid Id { get; set; }
+    public ExternalResourceType ResourceType { get; set; }
+    public Guid InternalId { get; set; }
+    public string System { get; set; } = null!;
+    public string Value { get; set; } = null!;
+    public DateTimeOffset CreatedAt { get; set; }
+}

VigilCareClinicalAPI/Domains/Enums/ExternalResourceType.cs

@@ -0,0 +1,22 @@
+public enum ExternalResourceType
+{
+    Patient,
+    Encounter
+}
+
+public static class ExternalResourceTypeExtensions
+{
+    public static string ToDbString(this ExternalResourceType t) => t switch
+    {
+        ExternalResourceType.Patient   => "PATIENT",
+        ExternalResourceType.Encounter => "ENCOUNTER",
+        _ => throw new ArgumentOutOfRangeException(nameof(t))
+    };
+
+    public static ExternalResourceType FromDbString(string v) => v switch
+    {
+        "PATIENT"   => ExternalResourceType.Patient,
+        "ENCOUNTER" => ExternalResourceType.Encounter,
+        _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown external resource type: '{v}'")
+    };
+}