feature: Schema, Migrations, Core CRUD, and Redis Threshold Cache

VigilCareClinicalAPI/Domains/Entities/AlertThreshold.cs

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+public class AlertThreshold
+{
+    public Guid Id { get; set; }
+    public string ObservationCode { get; set; } = null!;
+    public string DisplayName { get; set; } = null!;
+    public string Unit { get; set; } = null!;
+    public decimal? CriticalLow { get; set; }
+    public decimal? WarningLow { get; set; }
+    public decimal? WarningHigh { get; set; }
+    public decimal? CriticalHigh { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+}

VigilCareClinicalAPI/Domains/Entities/ClinicalAlert.cs

@@ -0,0 +1,17 @@
+public class ClinicalAlert
+{
+    public Guid Id { get; set; }
+    public Guid EncounterId { get; set; }
+    public Guid PatientId { get; set; }
+    public Guid? ObservationId { get; set; }
+    public AlertType AlertType { get; set; }
+    public AlertSeverity Severity { get; set; }
+    public string Details { get; set; } = null!;
+    public AlertStatus Status { get; set; } = AlertStatus.Open;
+    public DateTimeOffset? AcknowledgedAt { get; set; }
+    public string? AcknowledgedBy { get; set; }
+    public DateTimeOffset? ResolvedAt { get; set; }
+    public DateTimeOffset TriggeredAt { get; set; }
+
+    public Encounter Encounter { get; set; } = null!;
+}

VigilCareClinicalAPI/Domains/Entities/Encounter.cs

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+public class Encounter
+{
+    public Guid Id { get; set; }
+    public Guid PatientId { get; set; }
+    public EncounterType EncounterType { get; set; }
+    public EncounterStatus Status { get; set; }
+    public string Department { get; set; } = null!;
+    public string AttendingPhysician { get; set; } = null!;
+    public DateTimeOffset AdmittedAt { get; set; }
+    public DateTimeOffset? DischargedAt { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+
+    public Patient Patient { get; set; } = null!;
+    public ICollection<Observation> Observations { get; set; } = new List<Observation>();
+    public ICollection<ClinicalAlert> Alerts { get; set; } = new List<ClinicalAlert>();
+    public ICollection<Order> Orders { get; set; } = new List<Order>();
+}

VigilCareClinicalAPI/Domains/Entities/Observation.cs

@@ -0,0 +1,14 @@
+public class Observation
+{
+    public Guid Id { get; set; }
+    public Guid EncounterId { get; set; }
+    public string ObservationCode { get; set; } = null!;
+    public decimal Value { get; set; }
+    public string Unit { get; set; } = null!;
+    public ObservationSource Source { get; set; } = ObservationSource.Manual;
+    public string? IdempotencyKey { get; set; }
+    public DateTimeOffset RecordedAt { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+
+    public Encounter Encounter { get; set; } = null!;
+}

VigilCareClinicalAPI/Domains/Entities/Order.cs

@@ -0,0 +1,13 @@
+public class Order
+{
+    public Guid Id { get; set; }
+    public Guid EncounterId { get; set; }
+    public OrderType OrderType { get; set; }
+    public string Description { get; set; } = null!;
+    public string OrderedBy { get; set; } = null!;
+    public string Status { get; set; } = "pending";
+    public DateTimeOffset OrderedAt { get; set; }
+    public DateTimeOffset? ResultedAt { get; set; }
+
+    public Encounter Encounter { get; set; } = null!;
+}

VigilCareClinicalAPI/Domains/Entities/OutboxEvent.cs

@@ -0,0 +1,8 @@
+public class OutboxEvent
+{
+    public Guid Id { get; set; }
+    public string Topic { get; set; } = null!;
+    public string Payload { get; set; } = null!;  // JSON string
+    public DateTimeOffset CreatedAt { get; set; }
+    public DateTimeOffset? ProcessedAt { get; set; }
+}

VigilCareClinicalAPI/Domains/Entities/Patient.cs

@@ -0,0 +1,13 @@
+public class Patient
+{
+    public Guid Id { get; set; }
+    public string Mrn { get; set; } = null!;
+    public string FirstName { get; set; } = null!;
+    public string LastName { get; set; } = null!;
+    public DateOnly DateOfBirth { get; set; }
+    public string Gender { get; set; } = null!;
+    public string Status { get; set; } = "active";
+    public DateTimeOffset CreatedAt { get; set; }
+
+    public ICollection<Encounter> Encounters { get; set; } = new List<Encounter>();
+}

VigilCareClinicalAPI/Domains/Entities/ReconciliationAlert.cs

@@ -0,0 +1,10 @@
+public class ReconciliationAlert
+{
+    public Guid Id { get; set; }
+    public ReconciliationCheckType CheckType { get; set; }
+    public Guid? EncounterId { get; set; }
+    public Guid? PatientId { get; set; }
+    public string Details { get; set; } = null!;
+    public DateTimeOffset? ResolvedAt { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+}