Refactor all Training Module's Postgres queries to replace DELETE queries with INSERT and SELECT

[turnerrainer]

Important

This is a sub-issue of buerokratt/Buerokratt-Chatbot#483

Acceptance Criteria

• All AC of an epic apply

Scope

• https://github.com/buerokratt/Training-Module/tree/dev/DSL/Resql

[baha-a]

The DELETE command is not used in the Training Module, so this task should be closed.

[turnerrainer]

The DELETE command is not used in the Training Module, so this task should be closed.