Sync from GitHub main: v0.1.1 + v0.1.2 + wiki sync (#3)

src/WebhookServer.Core/Ipc/AdminProtocol.cs

@@ -26,6 +26,7 @@ public static class AdminOps
     public const string ListBackups = "list-backups";
     public const string RestoreBackup = "restore-backup";
     public const string ImportConfig = "import-config";
+    public const string CreateCheckpoint = "create-checkpoint";
 }
 
 public sealed class BackupEntry
@@ -33,6 +34,7 @@ public sealed class BackupEntry
     public string FileName { get; set; } = "";
     public DateTimeOffset SavedAt { get; set; }
     public long SizeBytes { get; set; }
+    public string? Description { get; set; }
 }
 
 public sealed class RestoreBackupArgs
@@ -40,6 +42,11 @@ public sealed class RestoreBackupArgs
     public string FileName { get; set; } = "";
 }
 
+public sealed class CreateCheckpointArgs
+{
+    public string? Description { get; set; }
+}
+
 public sealed class AdminRequest
 {
     [JsonPropertyName("op")] public string Op { get; set; } = "";

src/WebhookServer.Core/Storage/ConfigStore.cs

@@ -48,8 +48,15 @@ public sealed class ConfigStore
                 Directory.CreateDirectory(backupsDir);
                 var stamp = DateTime.UtcNow.ToString("yyyyMMdd-HHmmss");
                 var backupPath = System.IO.Path.Combine(backupsDir, $"config-{stamp}.json");
-                File.Copy(Path, backupPath, overwrite: false);
-                PruneBackups(backupsDir, retain: 30);
+                if (!File.Exists(backupPath))
+                {
+                    File.Copy(Path, backupPath, overwrite: false);
+                    var sidecar = new { description = "Before save", reason = "before-save" };
+                    File.WriteAllText(
+                        System.IO.Path.ChangeExtension(backupPath, ".meta.json"),
+                        JsonSerializer.Serialize(sidecar, ConfigJson.Compact));
+                }
+                PruneBackups(backupsDir, retain: 90);
             }
             catch
             {
@@ -71,11 +78,18 @@ public sealed class ConfigStore
     private static void PruneBackups(string backupsDir, int retain)
     {
         var stale = new DirectoryInfo(backupsDir).GetFiles("config-*.json")
+            .Where(f => !f.Name.EndsWith(".meta.json", StringComparison.OrdinalIgnoreCase))
             .OrderByDescending(f => f.Name)
             .Skip(retain);
         foreach (var f in stale)
         {
-            try { f.Delete(); } catch { }
+            try
+            {
+                f.Delete();
+                var sidecar = System.IO.Path.ChangeExtension(f.FullName, ".meta.json");
+                if (File.Exists(sidecar)) File.Delete(sidecar);
+            }
+            catch { }
         }
     }