feat(writer): 🎉 Enhance PostgreSQL writer, fixed bugs found using origin

pkg/readers/dbml/reader.go

@@ -587,10 +587,10 @@ func (r *Reader) parseColumn(line, tableName, schemaName string) (*models.Column
 					refOp := strings.TrimSpace(refStr)
 					var isReverse bool
 					if strings.HasPrefix(refOp, "<") {
-						isReverse = column.IsPrimaryKey // < on PK means "is referenced by" (reverse)
-					} else if strings.HasPrefix(refOp, ">") {
-						isReverse = !column.IsPrimaryKey // > on FK means reverse
+						// < means "is referenced by" - only makes sense on PK columns
+						isReverse = column.IsPrimaryKey
 					}
+					// > means "references" - always a forward FK, never reverse
 
 					constraint = r.parseRef(refStr)
 					if constraint != nil {