feature: Outbox Relay and Kafka Pipeline

VigilCareClinicalAPI/Services/AlertService.cs

@@ -96,6 +96,7 @@ public class AlertService : IAlertService
                 acknowledgedAt = alert.AcknowledgedAt,
                 note = req.Note
             }),
+            PartitionKey = alert.EncounterId.ToString(),
             CreatedAt = DateTimeOffset.UtcNow
         });
 

VigilCareClinicalAPI/Services/EncounterService.cs

@@ -1,3 +1,4 @@
+using System.Text.Json;
 using Microsoft.EntityFrameworkCore;
 
 public class EncounterService : IEncounterService
@@ -41,11 +42,29 @@ public class EncounterService : IEncounterService
             throw new ConflictException(
                 $"Transition to '{targetStatus}' is not permitted from the current status.",
                 "ILLEGAL_STATUS_TRANSITION");
-
+        
+        var previousStatus = encounter.Status;
         encounter.Status = targetStatus;
+
         if (targetStatus == EncounterStatus.Discharged)
             encounter.DischargedAt = DateTimeOffset.UtcNow;
 
+        _db.OutboxEvents.Add(new OutboxEvent
+        {
+            Id = Guid.NewGuid(),
+            Topic = "encounter.status.changed",
+            Payload = JsonSerializer.Serialize(new
+            {
+                encounterId,
+                patientId = encounter.PatientId,
+                previousStatus = previousStatus.ToDbString(),
+                newStatus = targetStatus.ToDbString(),
+                changedAt = DateTimeOffset.UtcNow
+            }),
+            PartitionKey = encounterId.ToString(),
+            CreatedAt = DateTimeOffset.UtcNow
+        });
+
         await _db.SaveChangesAsync();
         return new EncounterStatusTransitionResult(encounterId, targetStatus);
     }

VigilCareClinicalAPI/Services/ObservationService.cs

@@ -116,7 +116,7 @@ public class ObservationService : IObservationService
                     severity = alert.Severity.ToDbString(),
                     triggeredAt = alert.TriggeredAt,
                     partitionKey = encounterId.ToString()
-                }));
+                }, encounterId.ToString()));
             }
 
             // Step 7 — outbox event for the observation (always; Kafka consumer handles warnings)
@@ -131,7 +131,7 @@ public class ObservationService : IObservationService
                 source = req.Source.ToDbString(),
                 recordedAt = req.RecordedAt,
                 partitionKey = encounterId.ToString()
-            }));
+            }, encounterId.ToString()));
 
             // Step 8 — COMMIT
             await _db.SaveChangesAsync();
@@ -202,11 +202,12 @@ public class ObservationService : IObservationService
         return $"{req.ObservationCode} value {req.Value} {req.Unit} is above critical high of {t.CriticalHigh} {req.Unit}.";
     }
 
-    private static OutboxEvent BuildOutboxEvent(string topic, object payload) => new()
+    private static OutboxEvent BuildOutboxEvent(string topic, object payload, string partitionKey) => new()
     {
         Id = Guid.NewGuid(),
         Topic = topic,
         Payload = JsonSerializer.Serialize(payload),
+        PartitionKey = partitionKey,
         CreatedAt = DateTimeOffset.UtcNow
     };