track backup creation time on restore start (#918)

## Type of change

- [x] 🐹 Trivial/Minor

## Issue(s)

* #894

## Test Plan

- [x] 💪 Manual

src/internal/events/events.go

@@ -28,17 +28,18 @@ const (
 	RestoreEnd   = "restore-end"
 
 	// Event Data Keys
-	BackupID      = "backup-id"
-	DataRetrieved = "data-retrieved"
-	DataStored    = "data-stored"
-	Duration      = "duration"
-	EndTime       = "end-time"
-	ItemsRead     = "items-read"
-	ItemsWritten  = "items-written"
-	Resources     = "resources"
-	Service       = "service"
-	StartTime     = "start-time"
-	Status        = "status"
+	BackupCreateTime = "backup-creation-time"
+	BackupID         = "backup-id"
+	DataRetrieved    = "data-retrieved"
+	DataStored       = "data-stored"
+	Duration         = "duration"
+	EndTime          = "end-time"
+	ItemsRead        = "items-read"
+	ItemsWritten     = "items-written"
+	Resources        = "resources"
+	Service          = "service"
+	StartTime        = "start-time"
+	Status           = "status"
 )
 
 type Eventer interface {

src/internal/operations/backup.go

@@ -95,7 +95,6 @@ func (op *BackupOperation) Run(ctx context.Context) (err error) {
 			events.StartTime: startTime,
 			events.Service:   op.Selectors.Service.String(),
 			// TODO: initial backup ID,
-			// TODO: events.ExchangeResources: <count of resources>,
 		},
 	)
 

src/internal/operations/restore.go

@@ -86,21 +86,6 @@ type restoreStats struct {
 func (op *RestoreOperation) Run(ctx context.Context) (err error) {
 	startTime := time.Now()
 
-	// TODO: persist initial state of restoreOperation in modelstore
-	op.bus.Event(
-		ctx,
-		events.RestoreStart,
-		map[string]any{
-			events.StartTime: startTime,
-			events.Service:   op.Selectors.Service.String(),
-			events.BackupID:  op.BackupID,
-			// TODO: initial backup ID,
-			// TODO: events.ExchangeResources: <count of resources>,
-			// TODO: source backup time,
-			// TODO: restore options,
-		},
-	)
-
 	// persist operation results to the model store on exit
 	opStats := restoreStats{}
 	// TODO: persist results?
@@ -121,6 +106,18 @@ func (op *RestoreOperation) Run(ctx context.Context) (err error) {
 		return err
 	}
 
+	// TODO: persist initial state of restoreOperation in modelstore
+	op.bus.Event(
+		ctx,
+		events.RestoreStart,
+		map[string]any{
+			events.StartTime:        startTime,
+			events.BackupID:         op.BackupID,
+			events.BackupCreateTime: b.CreationTime,
+			// TODO: restore options,
+		},
+	)
+
 	var fds *details.Details
 
 	switch op.Selectors.Service {