diff --git a/backend/services/dbmigration/portable_data.go b/backend/services/dbmigration/portable_data.go
index 16ff9f8..4b497b8 100644
--- a/backend/services/dbmigration/portable_data.go
+++ b/backend/services/dbmigration/portable_data.go
@@ -182,12 +182,18 @@ func copyPortableTables(ctx context.Context, source *sql.Conn, target *sql.DB, p
 			return err
 		}
 		if plan.Target.Type == config.DatabaseTypePostgreSQL && types["id"] != "" {
-			// 显式复制主键后必须推进序列，否则重启后的新增记录会冲突。
 			quoted := quotePostgreSQLIdentifier(table)
-			query := "SELECT setval(pg_get_serial_sequence($1, 'id'), COALESCE(MAX(id), 1), MAX(id) IS NOT NULL) FROM " + quoted
-			if _, err := transaction.ExecContext(ctx, query, quoted); err != nil {
+			var sequence sql.NullString
+			if err := transaction.QueryRowContext(ctx, "SELECT pg_get_serial_sequence($1, 'id')", quoted).Scan(&sequence); err != nil {
 				return ErrSQLDataVerification
 			}
+			// 只有绑定序列的主键需要推进；日志等文本主键不能参与数值聚合。
+			if sequence.Valid {
+				query := "SELECT setval($1::regclass, COALESCE(MAX(id), 1), MAX(id) IS NOT NULL) FROM " + quoted
+				if _, err := transaction.ExecContext(ctx, query, sequence.String); err != nil {
+					return ErrSQLDataVerification
+				}
+			}
 		}
 	}
 	if err := synchronizeSequences(ctx, transaction, plan, sequences); err != nil {
diff --git a/backend/services/dbmigration/portable_integration_test.go b/backend/services/dbmigration/portable_integration_test.go
index 05e3c8d..aa83362 100644
--- a/backend/services/dbmigration/portable_integration_test.go
+++ b/backend/services/dbmigration/portable_integration_test.go
@@ -94,9 +94,11 @@ func runPortableIntegrationChain(t *testing.T, inputs []TargetInput) {
 		}
 		var subject string
 		queryErr := connection.QueryRowContext(ctx, "SELECT subject FROM email WHERE id=82").Scan(&subject)
+		var logPayload string
+		logErr := connection.QueryRowContext(ctx, "SELECT payload FROM mail_log WHERE id='migration-log'").Scan(&logPayload)
 		_, insertErr := connection.ExecContext(ctx, "INSERT INTO "+quoteDatabaseIdentifier(target.Type, "user")+" (account,name,password) VALUES ('next_hop_"+string(rune('a'+index))+"','sequence','test-only')")
 		_ = connection.Close()
-		if queryErr != nil || subject != "中文主题" || insertErr != nil {
+		if queryErr != nil || subject != "中文主题" || logErr != nil || logPayload != `{"message":"中文日志"}` || insertErr != nil {
 			t.Fatal("target content or identity sequence was not preserved")
 		}
 		source = target
diff --git a/backend/services/dbmigration/portable_test.go b/backend/services/dbmigration/portable_test.go
index f5133c0..0af2244 100644
--- a/backend/services/dbmigration/portable_test.go
+++ b/backend/services/dbmigration/portable_test.go
@@ -34,6 +34,7 @@ func portableFixture(t *testing.T) (string, config.DatabaseConfig) {
 		`INSERT INTO "user" (id,account,name,password) VALUES (40,'review','测试','hash')`,
 		`INSERT INTO email (id,subject,text,create_time) VALUES (82,'中文主题','正文😀','2026-09-05 12:30:00.123456')`,
 		`INSERT INTO sessions (token,data,expiry) VALUES ('token',x'0001ff',julianday('2026-09-12 12:00:00'))`,
+		`INSERT INTO mail_log (id,created_at,kind,actor_id,action,section,result,payload) VALUES ('migration-log',1,'mail','40','迁移验证','','success','{"message":"中文日志"}')`,
 		`INSERT INTO plugin_user_setting (plugin_id,user_id,schema_version,settings_ciphertext,settings_hash,enabled,created_at,updated_at) VALUES ('test',40,1,'cipher','hash',1,'2026-09-05 12:00:00','2026-09-05 12:00:00')`,
 	} {
 		if _, err := database.Exec(query); err != nil {
diff --git a/test/backend/log_store_integration_test.go b/test/backend/log_store_integration_test.go
index 0e3b508..e6e5afd 100644
--- a/test/backend/log_store_integration_test.go
+++ b/test/backend/log_store_integration_test.go
@@ -73,7 +73,17 @@ func TestLogStoreServerDatabaseIntegration(t *testing.T) {
 				t.Fatal("dedicated test database is unavailable")
 			}
 			migrations := migration.DefaultMigrations()
-			for _, statement := range migrations[len(migrations)-2].StatementsFor(test.dialect) {
+			var logSchema []string
+			for _, item := range migrations {
+				if item.Name == "create_managed_logs" {
+					logSchema = item.StatementsFor(test.dialect)
+					break
+				}
+			}
+			if len(logSchema) == 0 {
+				t.Fatal("managed log schema migration is missing")
+			}
+			for _, statement := range logSchema {
 				if strings.HasPrefix(statement, "CREATE TABLE IF NOT EXISTS ") {
 					statement = strings.Replace(statement, "CREATE TABLE IF NOT EXISTS ", "CREATE TEMPORARY TABLE ", 1)
 				}