[341] Reverts DB changes

[elceebee]

Context

We have decided to scale the DB back to it's pre-start-of-cycle state.

Changes proposed in this pull request

Reverts the change sin this commit.

Guidance to review

To note that there will be some downtime, currently planned for Wednesday morning. We will turn on the service information banner tomorrow morning to let people know it's going to happen (see PR.

Things to check

• If the code removes any existing feature flags, a data migration has also been added to delete the entry from the database
• This code does not rely on migrations in the same Pull Request
• If this code includes a migration adding or changing columns, it also backfills existing records for consistency
• If this code adds a column to the DB, decide whether it needs to be in analytics yml file or analytics blocklist
• API release notes have been updated if necessary
• If it adds a significant user-facing change, is it documented in the CHANGELOG?
• Required environment variables have been updated added to the Azure KeyVault
• Inform data insights team due to database changes
• Make sure all information from the Trello card is in here
• Rebased main
• Cleaned commit history
• Tested by running locally
• Add PR link to Trello card

[elceebee]

Decide whether or not to maintain current database CPU levels.