Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

@@ -16,0 +12,4 @@
+ | 0x21 + tokenKey                      | ByteArray  | serialized NameState struct                          |
+ | 0x22 + tokenKey + Hash160(tokenName) | Hash160    | container contract hash                              |
+ | 0x23 + tokenKey + Hash160(tokenName) | string     | global domain flag                                   |
+ | 0x24 + tokenKey                      | int        | number of subdomains for the TLD domain              |

@@ -277,7 +279,6 @@ func getGlobalDomain(ctx storage.Context, domain string) string {
 // extractCnametgt returns the value of the Cnametgt TXT record.
 func extractCnametgt(ctx storage.Context, name, domain string) string {
 	fragments := splitAndCheck(domain)
-

@@ -45,2 +45,4 @@
 	//This is necessary to distinguish it from regular CNAME records.
 	prefixGlobalDomain byte = 0x23
+	// prefixCountSubDomains contains information about the number of subdomains for the TLD domain.
+	// If it is nil, it will definitely be calculated on the first removal

@@ -326,2 +320,3 @@
-			return name
+			continue
 		}
+

@@ -409,2 +413,4 @@
 	postTransfer(oldOwner, owner, []byte(name), nil)
 	runtime.Notify("RegisterDomain", name)
+
+	countSubDomain := 0

@@ -578,3 +594,3 @@
 }
 
-func deleteDomain(ctx storage.Context, name string) {
+func restoreCountSubDomains(ctx storage.Context, name string) int {

@@ -588,0 +618,4 @@
+		countSubDomain = common.FromFixedWidth64(countSubDomainRaw.([]byte))
+	} else {
+		countSubDomain = restoreCountSubDomains(ctx, fragments[len(fragments)-1])
+		storage.Put(ctx, countSubDomainsKey, std.Serialize(common.ToFixedWidth64(countSubDomain)))

@@ -609,2 +651,4 @@
 	storage.Delete(ctx, nsKey)
 	storage.Delete(ctx, append([]byte{prefixRoot}, []byte(name)...))
+
+	isAutoCrated := storage.Get(ctx, autoCreatedPrefix)

@@ -610,1 +652,4 @@
 	storage.Delete(ctx, append([]byte{prefixRoot}, []byte(name)...))
+
+	isAutoCrated := storage.Get(ctx, autoCreatedPrefix)
+	if countSubDomain == 1 && isAutoCrated != nil {

@@ -344,3 +340,2 @@
 	fragments := splitAndCheck(name)
-	l := len(fragments)
-	tldKey := append([]byte{prefixRoot}, []byte(fragments[l-1])...)
+	isTLD := len(fragments)

@@ -610,1 +638,4 @@
 	storage.Delete(ctx, append([]byte{prefixRoot}, []byte(name)...))
+
+	isAutoCreated := storage.Get(ctx, autoCreatedPrefix)
+	if countSubDomain == 1 && isAutoCreated != nil {