downsize ecamp3-staging postgres DB back to 1GB RAM instance

[BacLuc]

Most likely by deleting the staging DB cluster and setting it up again.

The goal is to reduce the costs for the db instance. (and to have the same setup as in prod agani)

⚠️ you need to restore a prod snapshot again.
This takes now some time because we now have quite some data in the db.
And

• Migrate job cannot migrate database after restore on devel #3900

is not yet fixed.
After restoring, you need to deploy again, and run the script for the interesting camps manually.
While doing this, you can also collect

• Document connection pooling of database in wiki #3575

Only for @ecamp/core members

[BacLuc]

Done.
I did not have to set up the database again. I could fork it 2 times.
I also decreased the storage size to 10 GB like in prod.