import bpy
import bmesh

bpy.ops.wm.open_mainfile(filepath="characters/female/lena_nude/hires_work/01_imported.blend")
obj = bpy.context.selected_objects[0]
print(f"Working on {obj.name}")

mesh = obj.data
bpy.context.view_layer.objects.active = obj
bpy.ops.object.mode_set(mode="EDIT")
bpy.ops.mesh.select_all(action="DESELECT")

bm = bmesh.from_edit_mesh(mesh)
bm.edges.ensure_lookup_table()
for e in bm.edges:
    if e.is_boundary:
        e.select = True

print(f"Selected {len([e for e in bm.edges if e.select])} boundary edges")

bpy.ops.mesh.remove_doubles(threshold=0.001)

bpy.ops.object.mode_set(mode="OBJECT")
print("Welding complete.")

bpy.context.preferences.filepaths.save_version = 0  # no .blend1 autosave
bpy.ops.wm.save_as_mainfile(filepath="characters/female/lena_nude/hires_work/02_welded.blend")
print("Saved 02_welded.blend")