🐛 fix(sql): 修复时间字段复制与导出SQL格式

internal/sync/preview.go

@@ -21,6 +21,7 @@ type PreviewUpdateRow struct {
 type TableDiffPreview struct {
 	Table        string             `json:"table"`
 	PKColumn     string             `json:"pkColumn"`
+	ColumnTypes  map[string]string  `json:"columnTypes,omitempty"`
 	TotalInserts int                `json:"totalInserts"`
 	TotalUpdates int                `json:"totalUpdates"`
 	TotalDeletes int                `json:"totalDeletes"`
@@ -112,6 +113,7 @@ func (s *SyncEngine) Preview(config SyncConfig, tableName string, limit int) (Ta
 	out := TableDiffPreview{
 		Table:        tableName,
 		PKColumn:     pkCol,
+		ColumnTypes:  make(map[string]string, len(cols)),
 		TotalInserts: 0,
 		TotalUpdates: 0,
 		TotalDeletes: 0,
@@ -119,6 +121,14 @@ func (s *SyncEngine) Preview(config SyncConfig, tableName string, limit int) (Ta
 		Updates:      make([]PreviewUpdateRow, 0),
 		Deletes:      make([]PreviewRow, 0),
 	}
+	for _, col := range cols {
+		name := strings.ToLower(strings.TrimSpace(col.Name))
+		typ := strings.TrimSpace(col.Type)
+		if name == "" || typ == "" {
+			continue
+		}
+		out.ColumnTypes[name] = typ
+	}
 
 	sourcePKSet := make(map[string]struct{}, len(sourceRows))
 	for _, sRow := range sourceRows {