stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Provcache.Postgres/PostgresProvcacheRepository.DeleteFeedExpired.cs

@@ -0,0 +1,46 @@
+using Microsoft.EntityFrameworkCore;
+using System.Globalization;
+
+namespace StellaOps.Provcache.Postgres;
+
+public sealed partial class PostgresProvcacheRepository
+{
+    /// <inheritdoc />
+    public async Task<long> DeleteByFeedEpochOlderThanAsync(string feedEpoch, CancellationToken cancellationToken = default)
+    {
+        var deleted = await _context.ProvcacheItems
+            .Where(e => string.Compare(e.FeedEpoch, feedEpoch) < 0)
+            .ExecuteDeleteAsync(cancellationToken)
+            .ConfigureAwait(false);
+
+        if (deleted > 0)
+        {
+            await LogRevocationAsync("feed", feedEpoch, "feed-update", deleted, cancellationToken)
+                .ConfigureAwait(false);
+        }
+
+        return deleted;
+    }
+
+    /// <inheritdoc />
+    public async Task<long> DeleteExpiredAsync(DateTimeOffset asOf, CancellationToken cancellationToken = default)
+    {
+        var deleted = await _context.ProvcacheItems
+            .Where(e => e.ExpiresAt <= asOf)
+            .ExecuteDeleteAsync(cancellationToken)
+            .ConfigureAwait(false);
+
+        if (deleted > 0)
+        {
+            await LogRevocationAsync(
+                    "expired",
+                    asOf.ToString("O", CultureInfo.InvariantCulture),
+                    "ttl-expiry",
+                    deleted,
+                    cancellationToken)
+                .ConfigureAwait(false);
+        }
+
+        return deleted;
+    }
+}