1. case 1: elgris

settings
  devices
    services
      sunspec
        configure
          submit
            prefix
              __new_name__
ha-renentity -e sensor.emeter -n sensor.elgris

2. case 2: sma

settings
  devices
    services
      sma solar
        1 device
          pencil (right corner)
            rename
              name
                __new_name__
ha-renentity -e sensor.stp6_0_3av_40_316 -n sensor.sma041
. entity: sensor.stp6_0_3av_40_316
.    new: sensor.sma041

. r u sure u wonna do this ? (y/n) y

. stop homeassistant
. exporting -> db.sql ...40.8MiB 0:00:01 [40.8MiB/s] [  <=>                   ]
. cube -> db.sql ...
. importing <- db.sql ...1.62MiB 0:00:01 [1.61MiB/s] [>======================>] 100%
. cube -> /config/.storage/core.entity_registry ...
. cube -> /config/.storage/core.restore_state ...
. cube -> /config/.storage/energy ...
. cube -> /config/.storage/lovelace ...
. start homeassistant
. done.

3. bug

Duplicate entry 'sensor.sma041_current_l1' for key 'ix_states_meta_entity_id'
Duplicate entry 'sensor.sma041_current_total' for key 'ix_statistics_meta_statistic_id'