INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values (6181, 'EPSG', 6181, '+vunits=m +no_defs +type=crs', 'VERT_CS["Horta height",VERT_DATUM["Horta",2005,AUTHORITY["EPSG","1104"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","6181"]]');