EPSG:9722 — Cagliari 1956 height

VERTCRS[
    "Cagliari 1956 height",
    VDATUM["Cagliari 1956",ID["EPSG",1307]],
    CS[vertical,1,ID["EPSG",6499]],
    AXIS["Gravity-related height (H)",up],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",9722]
]

+vunits=m +no_defs +type=crs

proj4.defs("EPSG:9722", "+vunits=m +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 9722,
  "name": "Cagliari 1956 height",
  "kind": "vertical",
  "area": "Italy - Sardinia onshore",
  "unit": "metre",
  "bbox": [
    38.82,
    8.08,
    41.31,
    9.89
  ],
  "proj4": "+vunits=m +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (9722, 'EPSG', 9722, '+vunits=m +no_defs +type=crs', 'VERT_CS["Cagliari 1956 height",VERT_DATUM["Cagliari 1956",2005,AUTHORITY["EPSG","1307"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","9722"]]');

PROJECTION
  "+vunits=m"
  "+no_defs"
  "+type=crs"
END

9722=VERT_CS["Cagliari 1956 height",VERT_DATUM["Cagliari 1956",2005,AUTHORITY["EPSG","1307"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","9722"]]