So, I just have installed this supermegacooltool 
and want to say thank you @scr for the effort.
Excellent!
And, it did run.
So I have:
| Domain | Count |
|---|---|
| Automation | 67 |
| Binary Sensor | 234 |
| Button | 41 |
| Calendar | 7 |
| Camera | 1 |
| Climate | 4 |
| Cover | 3 |
| Device Tracker | 36 |
| Group | 1 |
| Input Select | 1 |
| Light | 10 |
| Media Player | 23 |
| Number | 12 |
| Person | 4 |
| Remote | 3 |
| Scene | 34 |
| Script | 30 |
| Select | 12 |
| Sensor | 837 |
| Sun | 1 |
| Switch | 56 |
| Timer | 2 |
| Update | 15 |
| Weather | 6 |
| Zone | 12 |
and Watchman found 2 errors. One misspelled entity in automation, one entity mentioned in scenes, which has been renamed by reinstall of integration later.
2 only! Actually I’ve immediately got proud of myself 
My own effort on clean administration has worked. This gives confidence