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Condense Database Migrations (#17103)

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* Condense Database Migrations

Condenses the Database Migrations into a new initial schema.
Also adds some instructions to the Database Readme for existing setups.

* Update readme/delete changed migrations since pr creation

* Reworks a bit how the previous migrations are handled and updates the instructions accordingly

* Expand the readme with baseline/migrate

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Co-authored-by: Werner <Arrow768@users.noreply.github.com>
This commit is contained in:
Werner
2023-08-19 22:32:13 +02:00
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parent c93aa1dfba
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SQL/README.md
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### Compacted Migrations
To decrease the runtime of the migration unit test, the database migrations will be compacted into a single migration on a regular base.
In order to do so, a new "migrate-VERSION" subfolder is created.
The initial migration in these subfolders is always a migration with the current db-schema as of the current PR.
In addition the flayway.conf file in the root of the project is updated to use the new migration folder and create a new schema history table (that tracks the applied migrations).
#### How does this impact you?
If you set up a new database:
Make sure to use the latest migration folder, it will contain everything needed to create a "fresh" database.
If you have a existing database:
Update to the latest migration in the migration folder that you have used so far.
Then switch to the next migration folder (and a new schema version table)
You should use flyway with `-baselineVersion="1" baseline` instead of the usual migrate for the initial migration
As usual, always make sure that you have a backup and test it first on a non-production copy
### Prerequisites
The server connects to a mysql-compatible server (mysql, mariadb, percona), so you'll need one of those with a database and user/password pair ready.