stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Provcache.Postgres/PostgresEvidenceChunkRepository.Manifest.cs

@@ -0,0 +1,56 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace StellaOps.Provcache.Postgres;
+
+public sealed partial class PostgresEvidenceChunkRepository
+{
+    /// <inheritdoc />
+    public async Task<ChunkManifest?> GetManifestAsync(
+        string proofRoot,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(proofRoot);
+
+        // Get metadata without loading blobs
+        var chunks = await _context.EvidenceChunks
+            .Where(e => e.ProofRoot == proofRoot)
+            .OrderBy(e => e.ChunkIndex)
+            .Select(e => new
+            {
+                e.ChunkId,
+                e.ChunkIndex,
+                e.ChunkHash,
+                e.BlobSize,
+                e.ContentType,
+                e.CreatedAt
+            })
+            .AsNoTracking()
+            .ToListAsync(cancellationToken)
+            .ConfigureAwait(false);
+
+        if (chunks.Count == 0)
+        {
+            return null;
+        }
+
+        var metadata = chunks
+            .Select(c => new ChunkMetadata
+            {
+                ChunkId = c.ChunkId,
+                Index = c.ChunkIndex,
+                Hash = c.ChunkHash,
+                Size = c.BlobSize,
+                ContentType = c.ContentType
+            })
+            .ToList();
+
+        return new ChunkManifest
+        {
+            ProofRoot = proofRoot,
+            TotalChunks = chunks.Count,
+            TotalSize = chunks.Sum(c => (long)c.BlobSize),
+            Chunks = metadata,
+            GeneratedAt = _timeProvider.GetUtcNow()
+        };
+    }
+}