EPSG:7700 — Latvia 2000 height

VERTCRS[
    "Latvia 2000 height",
    VDATUM["Latvian Height System 2000",ID["EPSG",1162]],
    CS[vertical,1,ID["EPSG",6499]],
    AXIS["Gravity-related height (H)",up],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",7700]
]

+vunits=m +no_defs +type=crs

proj4.defs("EPSG:7700", "+vunits=m +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 7700,
  "name": "Latvia 2000 height",
  "kind": "vertical",
  "area": "Latvia - onshore",
  "unit": "metre",
  "bbox": [
    55.67,
    20.87,
    58.09,
    28.24
  ],
  "proj4": "+vunits=m +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (7700, 'EPSG', 7700, '+vunits=m +no_defs +type=crs', 'VERT_CS["Latvia 2000 height",VERT_DATUM["Latvian Height System 2000",2005,AUTHORITY["EPSG","1162"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","7700"]]');

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

7700=VERT_CS["Latvia 2000 height",VERT_DATUM["Latvian Height System 2000",2005,AUTHORITY["EPSG","1162"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","7700"]]