postgis - GRASS v.hull for many point sets

I have map "my_pointmap" with 3D points with ids=(1,2,3...N). I have also list of subsets of these point ids , S = [(1,2,3,4),(2,4,10,12), ...]. I would love to get GRASS GIS vector map with |S| 3D convex hulls.

for s in S:
    s_ids_string = ",".join(map(str, s))
    gscript.run_command('v.hull',

                     input="my_pointmap",
                     output="my_hullmap",
                     layer = 1,
                     where = "id in ("+s_ids_string +")")

This of course works only for the first iteration. The second one throws error that the layer "my_hullmap" already exists. I could create |S| maps called "my_hullmap_%s". But since S is quite long, I would end up with humongous number of maps.

Note: Since ST_Hull in PostGIS is not doing what it should/could, I am here. Once I will have the map of 3D hulls, I will use v.out.postgis to store it back to postgis.