v0.307.0: after a restart the Databases table lists each database once, not every pre-restore undo copy

Seen on demo-hp 2026-10-10 (adventurelog x4, bookstack x4). The synthesised run skips IsUndo files; only undo copies
-> no synthesised run. Two tests, both red-proved. v0.306.0 (R-570) was built but never delivered; 0.307.0 carries it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/backup/backup.go

@@ -1311,6 +1311,12 @@ func (m *Manager) GetFullStatus(nextDBDump time.Time) *FullBackupStatus {
 			var results []DumpResult
 			var latestTime time.Time
 			for _, f := range status.DumpFiles {
+				// 2026-10-10: a `pre-restore-` undo copy (R-379) is not part of any run — it stays in the file
+				// list, never in the run's table (demo-hp listed adventurelog four times after a restart).
+				// Pinned by TestSynthesisedRunListsNoUndoCopy.
+				if f.IsUndo {
+					continue
+				}
 				results = append(results, DumpResult{
 					DB:         DiscoveredDB{StackName: f.StackName, DBType: f.DBType, ContainerName: f.StackName},
 					FilePath:   f.FileName,
@@ -1323,10 +1329,13 @@ func (m *Manager) GetFullStatus(nextDBDump time.Time) *FullBackupStatus {
 			}
 			// R-519: after a restart the run's result is not in memory, so it is SYNTHESISED from the files. A run
 			// the stop cut off left a fresh .sql beside last night's tars — "Success" must not be read off that.
-			status.LastDBDump = &DBDumpStatus{
-				LastRun: latestTime,
-				Results: results,
-				Success: m.runInterrupted.IsZero(),
+			// Only undo copies on disk → no run to show (nil, as with no files at all).
+			if len(results) > 0 {
+				status.LastDBDump = &DBDumpStatus{
+					LastRun: latestTime,
+					Results: results,
+					Success: m.runInterrupted.IsZero(),
+				}
 			}
 		}