Warnings when migrating new empty sqlite

[elisalle]

When creating an empty database and migrating it to the latest version, like this:

from threedi_schema import ThreediDatabase

db = ThreediDatabase("test.sqlite")
schema = db.schema
schema.upgrade(backup=False, epsg_code_override=28992)

the following warnings appear:

updateTableTriggers() error: not existing Table or Column
AddGeometryColumn() error: "UNIQUE constraint failed: geometry_columns.f_table_name, geometry_columns.f_geometry_column"
updateTableTriggers: "table "idx_channel_geom" already exists"
updateTableTriggers: "table "idx_connection_node_geom" already exists"
updateTableTriggers: "table "idx_cross_section_location_geom" already exists"
updateTableTriggers: "table "idx_culvert_geom" already exists"
updateTableTriggers: "table "idx_orifice_geom" already exists"
updateTableTriggers: "table "idx_pipe_geom" already exists"
updateTableTriggers: "table "idx_pump_geom" already exists"
updateTableTriggers: "table "idx_pump_map_geom" already exists"
updateTableTriggers: "table "idx_weir_geom" already exists"
updateTableTriggers: "table "idx_windshielding_1d_geom" already exists"

This should probably be looked into.