[#1944] metabase: Recreate static buckets instead of resetting

From the `Bucket.ForEach` doc:
```
The provided function must not modify the bucket; this will result in undefined behavior.
```

Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>

pkg/local_object_storage/metabase/control.go

@@ -106,15 +106,17 @@ func (db *DB) init(reset bool) error {
 			}
 		}
 		for k := range mStaticBuckets {
-			b, err := tx.CreateBucketIfNotExists([]byte(k))
+			name := []byte(k)
-			if err != nil {
+			if reset {
-				return fmt.Errorf("could not create static bucket %s: %w", k, err)
+				err := tx.DeleteBucket(name)
+				if err != nil && !errors.Is(err, bbolt.ErrBucketNotFound) {
+					return fmt.Errorf("could not delete static bucket %s: %w", k, err)
+				}
 			}
 
-			if reset {
+			_, err := tx.CreateBucketIfNotExists(name)
-				if err = resetBucket(b); err != nil {
+			if err != nil {
-					return fmt.Errorf("could not reset static bucket %s: %w", k, err)
+				return fmt.Errorf("could not create static bucket %s: %w", k, err)
-				}
 			}
 		}
 

pkg/local_object_storage/metabase/util.go

@@ -223,17 +223,6 @@ func objectKey(obj oid.ID, key []byte) []byte {
 	return key[:objectKeySize]
 }
 
-// removes all bucket elements.
-func resetBucket(b *bbolt.Bucket) error {
-	return b.ForEach(func(k, v []byte) error {
-		if v != nil {
-			return b.Delete(k)
-		}
-
-		return b.DeleteBucket(k)
-	})
-}
-
 // if meets irregular object container in objs - returns its type, otherwise returns object.TypeRegular.
 //
 // firstIrregularObjectType(tx, cnr, obj) usage allows getting object type.