feat(site-runtime): persist native-alarm display metadata so rehydrated conditions render fully (UA4)

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/Actors/NativeAlarmActor.cs

@@ -191,13 +191,26 @@ public class NativeAlarmActor : ReceiveActor
                 continue;
             }
 
-            // Metadata (type/category/message) is not persisted — rehydrate the
-            // condition + key so the DebugView reflects last-known state until the
-            // first source snapshot replaces it.
+            // Restore the persisted display metadata (UA4) so the rehydrated condition renders
+            // fully (type/category/message/values) until the first source snapshot replaces it.
+            // Null/malformed metadata falls back to empty strings (pre-UA4 rows behave as before).
+            NativeAlarmMetadata meta = EmptyMetadata;
+            if (!string.IsNullOrEmpty(row.MetadataJson))
+            {
+                try
+                {
+                    meta = JsonSerializer.Deserialize<NativeAlarmMetadata>(row.MetadataJson) ?? EmptyMetadata;
+                }
+                catch (JsonException)
+                {
+                    meta = EmptyMetadata;
+                }
+            }
+
             var t = new NativeAlarmTransition(
-                row.SourceReference, string.Empty, string.Empty, AlarmTransitionKind.Snapshot,
-                condition, string.Empty, string.Empty, string.Empty, string.Empty, string.Empty,
-                null, row.LastTransitionAt, string.Empty, string.Empty);
+                row.SourceReference, string.Empty, meta.AlarmTypeName, AlarmTransitionKind.Snapshot,
+                condition, meta.Category, string.Empty, meta.Message, string.Empty, string.Empty,
+                null, row.LastTransitionAt, meta.CurrentValue, meta.LimitValue);
             _alarms[row.SourceReference] = t;
             // Rehydration replays last-known state on (re)start — surface it
             // upward for the DebugView but do NOT re-log it as a fresh operational
@@ -479,7 +492,12 @@ public class NativeAlarmActor : ReceiveActor
             return;
 
         var batch = _dirtyUpserts.Values
-            .Select(t => (t.SourceReference, JsonSerializer.Serialize(t.Condition), t.TransitionTime))
+            .Select(t => (
+                t.SourceReference,
+                JsonSerializer.Serialize(t.Condition),
+                (string?)JsonSerializer.Serialize(new NativeAlarmMetadata(
+                    t.AlarmTypeName, t.Category, t.Message, t.CurrentValue, t.LimitValue)),
+                t.TransitionTime))
             .ToList();
         _dirtyUpserts.Clear();
 
@@ -519,4 +537,16 @@ public class NativeAlarmActor : ReceiveActor
         public static readonly FlushPersistence Instance = new();
         private FlushPersistence() { }
     }
+
+    /// <summary>Empty metadata fallback for pre-UA4 rows or malformed <c>metadata_json</c>.</summary>
+    private static readonly NativeAlarmMetadata EmptyMetadata =
+        new(string.Empty, string.Empty, string.Empty, string.Empty, string.Empty);
+
+    /// <summary>
+    /// Persisted display metadata for a native alarm condition (UA4). Serialized into the
+    /// <c>metadata_json</c> column so a rehydrated condition renders fully (type/category/message/
+    /// current+limit values) before the first source snapshot re-supplies it.
+    /// </summary>
+    private sealed record NativeAlarmMetadata(
+        string AlarmTypeName, string Category, string Message, string CurrentValue, string LimitValue);
 }