/usr/lib/libreoffice/program/services/postgresql-sdbc.rdb is in libreoffice-sdbc-postgresql 1:4.2.3~rc3-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | <?xml version="1.0"?>
<components xmlns="http://openoffice.org/2010/uno-components"><component loader="com.sun.star.loader.SharedLibrary" prefix="postgresql_sdbc" uri="vnd.sun.star.expand:$LO_LIB_DIR/libpostgresql-sdbclo.so"><implementation name="org.openoffice.comp.connectivity.pq.Driver.noext"><service name="com.sun.star.sdbc.Driver"/></implementation></component><component loader="com.sun.star.loader.SharedLibrary" prefix="postgresql_sdbc_impl" uri="vnd.sun.star.expand:$LO_LIB_DIR/libpostgresql-sdbc-impllo.so"><implementation name="org.openoffice.comp.connectivity.pq.Connection.noext"><service name="com.sun.star.sdbc.Connection"/></implementation></component></components>
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