emqx4.3/apps/emqx_postgresql/src/emqx_postgresql.app.src

{application, emqx_postgresql, [
    {description, "EMQX PostgreSQL Database Connector"},
    {vsn, "0.1.1"},
    {registered, []},
    {applications, [
        kernel,
        stdlib,
        epgsql,
        emqx_connector,
        emqx_resource
    ]},
    {env, []},
    {modules, []},

    {links, []}
]}.