1. 146 schema migration (spaces cluster)
  safe to run

2. 147 schema migration (metric_key_id)
  safe to run
  took 10min on stage

3. 148 schema migration (metric_key_name_id, also metric_key_id FK)
  safe to run
  took 1528s on stage

Per space part:

4. 036 data migration (metric_key_names metric_key_id)
  run per space
  took 1536s on stage for 5147 for 75836 records
  **make index and then it will be faster**

5. 037 data migration
  run per space
  took 2.4s on stage for 5147 for  75836 records
  **that was with index**




## Important as fuck:

- FK constraint on metric_key_names was dropped after migration finished. It will (and must) be added when all metric_key_names have their respective metric_key_id. And then cascade delete must be added. So

`ALTER TABLE metric_key_names ADD CONSTRAINT fk_metric_key_names FOREIGN KEY (metric_key_id) REFERENCES metric_keys(metric_key_id);`

Must also include on delete cascade.