Fix: FHIR bundle processing has no rollback on partial failure

VigilCareClinicalAPI/Fhir/FhirBundleProcessor.cs

@@ -1,7 +1,9 @@
 using Hl7.Fhir.Model;
+using Microsoft.EntityFrameworkCore;
 
 public class FhirBundleProcessor
 {
+    private readonly AppDbContext _db;
     private readonly IPatientService _patients;
     private readonly IEncounterService _encounters;
     private readonly IObservationService _observations;
@@ -12,6 +14,7 @@ public class FhirBundleProcessor
     private readonly MedicationAdministrationFhirMapper _medMapper;
 
     public FhirBundleProcessor(
+        AppDbContext db,
         IPatientService patients,
         IEncounterService encounters,
         IObservationService observations,
@@ -21,6 +24,7 @@ public class FhirBundleProcessor
         ObservationFhirMapper observationMapper,
         MedicationAdministrationFhirMapper medMapper)
     {
+        _db = db;
         _patients = patients;
         _encounters = encounters;
         _observations = observations;
@@ -35,11 +39,12 @@ public class FhirBundleProcessor
     {
         var response = new Bundle { Type = Bundle.BundleType.TransactionResponse };
 
-        // Process in dependency order: Patient → Encounter → Observation/MedAdmin
         var entries = transaction.Entry
             .OrderBy(e => Priority(e.Resource))
             .ToList();
 
+        await using var tx = await _db.Database.BeginTransactionAsync();
+
         foreach (var entry in entries)
         {
             var resource = entry.Resource;
@@ -66,6 +71,8 @@ public class FhirBundleProcessor
             }
             catch (Exception ex)
             {
+                await tx.RollbackAsync();
+
                 response.Entry.Add(new Bundle.EntryComponent
                 {
                     Response = new Bundle.ResponseComponent
@@ -74,10 +81,11 @@ public class FhirBundleProcessor
                         Outcome = FhirOperationOutcomeBuilder.FromException(ex)
                     }
                 });
-                break; // transaction semantics — stop on first failure
+                return response;
             }
         }
 
+        await tx.CommitAsync();
         return response;
     }