Refactor code structure for improved readability and maintainability; optimize performance in key functions.

src/Graph/StellaOps.Graph.Indexer/Ingestion/Sbom/SbomSnapshot.cs

@@ -16,6 +16,21 @@ public sealed class SbomSnapshot
     [JsonPropertyName("sbomDigest")]
     public string SbomDigest { get; init; } = string.Empty;
 
+    [JsonPropertyName("sbomVersionId")]
+    public string SbomVersionId { get; init; } = string.Empty;
+
+    [JsonPropertyName("sbomSequence")]
+    public int SbomSequence { get; init; }
+
+    [JsonPropertyName("sbomFormat")]
+    public string SbomFormat { get; init; } = string.Empty;
+
+    [JsonPropertyName("sbomFormatVersion")]
+    public string SbomFormatVersion { get; init; } = string.Empty;
+
+    [JsonPropertyName("chainId")]
+    public string ChainId { get; init; } = string.Empty;
+
     [JsonPropertyName("collectedAt")]
     public DateTimeOffset CollectedAt { get; init; } = DateTimeOffset.UnixEpoch;
 
@@ -33,6 +48,9 @@ public sealed class SbomSnapshot
 
     [JsonPropertyName("baseArtifacts")]
     public IReadOnlyList<SbomBaseArtifact> BaseArtifacts { get; init; } = Array.Empty<SbomBaseArtifact>();
+
+    [JsonPropertyName("lineage")]
+    public IReadOnlyList<SbomLineageReference> Lineage { get; init; } = Array.Empty<SbomLineageReference>();
 }
 
 public sealed class SbomArtifactMetadata
@@ -229,3 +247,24 @@ public sealed class SbomBaseArtifact
     [JsonPropertyName("source")]
     public string Source { get; init; } = string.Empty;
 }
+
+public sealed class SbomLineageReference
+{
+    [JsonPropertyName("relationship")]
+    public string Relationship { get; init; } = string.Empty;
+
+    [JsonPropertyName("sbomDigest")]
+    public string SbomDigest { get; init; } = string.Empty;
+
+    [JsonPropertyName("artifactDigest")]
+    public string ArtifactDigest { get; init; } = string.Empty;
+
+    [JsonPropertyName("eventOffset")]
+    public long EventOffset { get; init; }
+
+    [JsonPropertyName("collectedAt")]
+    public DateTimeOffset CollectedAt { get; init; } = DateTimeOffset.UnixEpoch;
+
+    [JsonPropertyName("source")]
+    public string Source { get; init; } = string.Empty;
+}