If you are exporting a product that uses PostgreSQL from the United States to another country, you may need the following information:
Unfortunately, there are no definitive guidelines for assigning an ECCN to PostgreSQL. Based on this PostgreSQL forum post, the ECCN number for PostgreSQL may be either 5A992 or 5D992 as “mass market encryption” software.
Similarly, there are no definitive guidelines for assigning an HTS number to PostgreSQL. Based on this U.S. Department of Commerce page, PostgreSQL would fall under the Other category of Computer Software, number 8524.99.4000.