EPSG:5749 — St. Marys height

VERTCRS[
    "St. Marys height",
    VDATUM["St. Marys",ID["EPSG",5147]],
    CS[vertical,1,ID["EPSG",6499]],
    AXIS["Gravity-related height (H)",up],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    GEOIDMODEL["ETRS89-GBR [OSNet v2009] to St. Marys height (2)",ID["EPSG",7716]],
    GEOIDMODEL["ETRS89 to St. Marys height (1)",ID["EPSG",10032]],
    ID["EPSG",5749]
]

+vunits=m +no_defs +type=crs

proj4.defs("EPSG:5749", "+vunits=m +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 5749,
  "name": "St. Marys height",
  "kind": "vertical",
  "area": "UK - Scilly Isles onshore",
  "unit": "metre",
  "bbox": [
    49.86,
    -6.41,
    49.99,
    -6.23
  ],
  "proj4": "+vunits=m +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (5749, 'EPSG', 5749, '+vunits=m +no_defs +type=crs', 'VERT_CS["St. Marys height",VERT_DATUM["St. Marys",2005,AUTHORITY["EPSG","5147"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5749"]]');

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

5749=VERT_CS["St. Marys height",VERT_DATUM["St. Marys",2005,AUTHORITY["EPSG","5147"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5749"]]