part #2

src/__Libraries/StellaOps.Evidence.Persistence/Postgres/PostgresEvidenceStore.Map.cs

@@ -0,0 +1,38 @@
+using Npgsql;
+using StellaOps.Evidence.Core;
+using System.Text.Json;
+
+namespace StellaOps.Evidence.Persistence.Postgres;
+
+public sealed partial class PostgresEvidenceStore
+{
+    private static IEvidence MapEvidence(NpgsqlDataReader reader)
+    {
+        var evidenceId = reader.GetString(0);
+        var subjectNodeId = reader.GetString(1);
+        var evidenceType = (EvidenceType)reader.GetInt16(2);
+        var payload = reader.GetFieldValue<byte[]>(3);
+        var payloadSchemaVer = reader.GetString(4);
+        var externalCid = GetNullableString(reader, 5);
+        var provenanceJson = reader.GetString(6);
+        var signaturesJson = reader.GetString(7);
+
+        var provenance = JsonSerializer.Deserialize<EvidenceProvenance>(provenanceJson, _jsonOptions)
+            ?? throw new InvalidOperationException($"Failed to deserialize provenance for evidence {evidenceId}");
+
+        var signatures = JsonSerializer.Deserialize<List<EvidenceSignature>>(signaturesJson, _jsonOptions)
+            ?? [];
+
+        return new EvidenceRecord
+        {
+            EvidenceId = evidenceId,
+            SubjectNodeId = subjectNodeId,
+            EvidenceType = evidenceType,
+            Payload = payload,
+            PayloadSchemaVersion = payloadSchemaVer,
+            ExternalPayloadCid = externalCid,
+            Provenance = provenance,
+            Signatures = signatures
+        };
+    }
+}