fix(migrations): seed log migration flag

internal/infra/persistence/migrator/goose/postgres/202610070004_seed_log_db_migration_flag.sql

@@ -0,0 +1,7 @@
+-- +goose Up
+INSERT INTO w_system_configs (key, value, type, visibility, description, created_at, updated_at)
+VALUES ('log_db_migration', '', 'system', 0, '日志数据库切换冻结标记', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
+ON CONFLICT (key) DO NOTHING;
+
+-- +goose Down
+-- Keep the runtime migration flag: this row may have existed before this migration.

internal/infra/persistence/migrator/goose/sqlite/202610070004_seed_log_db_migration_flag.sql

@@ -0,0 +1,6 @@
+-- +goose Up
+INSERT OR IGNORE INTO w_system_configs (key, value, type, visibility, description, created_at, updated_at)
+VALUES ('log_db_migration', '', 'system', 0, '日志数据库切换冻结标记', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP);
+
+-- +goose Down
+-- Keep the runtime migration flag: this row may have existed before this migration.

internal/infra/persistence/migrator/migrator_test.go

@@ -24,7 +24,7 @@ import (
 // （初始系统配置 + 各期配置迁移/新增 seed：of_options 迁移、文件白名单、磁盘缓存、
 // 登录会话 TTL、升级源、存储、FRPS Web UI、Pages、OpenResty 限流、单 IP 限频、
 // 错误页、SW 离线、日志保留期、指标保留期等）；新增配置 seed 迁移时需同步更新本常量。
-const expectedMigratedSystemConfigCount = 95
+const expectedMigratedSystemConfigCount = 96
 
 func TestGooseMigrationVersionsAreUniquePerDialect(t *testing.T) {
 	for _, dir := range []string{"goose/postgres", "goose/sqlite"} {
@@ -89,6 +89,14 @@ func TestMigrateInitializesSQLiteDatabase(t *testing.T) {
 		t.Errorf("Migrate() w_system_configs count = %d, want %d", systemConfigCount, expectedMigratedSystemConfigCount)
 	}
 
+	var logMigrationConfig model.SystemConfig
+	if err := sqliteDB.Where("key = ?", model.ConfigKeyLogDBMigration).First(&logMigrationConfig).Error; err != nil {
+		t.Fatalf("Migrate() log migration config error = %v", err)
+	}
+	if logMigrationConfig.Value != "" || logMigrationConfig.Type != "system" || logMigrationConfig.Visibility != model.ConfigVisibilityHidden {
+		t.Errorf("Migrate() log migration config = %+v, want an empty hidden system config", logMigrationConfig)
+	}
+
 	var adminCount int64
 	if err := sqliteDB.Table("w_users").Where("username = ?", "admin").Count(&adminCount).Error; err != nil {
 		t.Fatalf("Migrate() count admin user error = %v", err)