Fix postgres auto increment primary key

Add "GENERATED BY DEFAULT AS IDENTITY" if field is auto increment

Author: rudcode

src/utils/exportSQL/postgres.js

@@ -32,6 +32,8 @@ export function toPostgres(diagram) {
               `${exportFieldComment(field.comment)}\t"${
                 field.name
               }" ${field.type}${field.isArray ? " ARRAY" : ""}${field.notNull ? " NOT NULL" : ""}${field.unique ? " UNIQUE" : ""}${
+                field.increment ? " GENERATED BY DEFAULT AS IDENTITY" : ""
+              }${
                 field.default.trim() !== ""
                   ? ` DEFAULT ${parseDefault(field, diagram.database)}`
                   : ""