Hello @El Comercio Paraguayo,
Welcome to Atlassian Community!
For Jira Server, the supported PostgreSQL databases are 11, 10, and 9.6. PostgreSQL 12 is currently not supported.
For more information about the supported platforms, please check the documentation below:
Regarding PostgreSQL 12, there is a feature request suggesting support for this version:
Please, click on vote and watch to receive updates about the feature.
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