Export PostGIS schema to GPKG
ogr2ogr --config PG_LIST_ALL_TABLES YES --config PG_SKIP_VIEWS YES -f "GPKG" GPKG_Filename.gpkg -progress PG:"dbname=xxx user=xxx password=xxx active_schema=xxx schemas=xxx port=xxx host=xxx" -gt 1000000 -a_srs "EPSG:27700"