DB schema diagrams

Hello, 

I'm looking for the schema diagrams for RT 4.2.12, but on the wiki (https://rt-wiki.bestpractical.com/wiki/Schema) there are no links for the following files : 
- Rt schema.svg 
- Rt4-schema-relationships.svg 
and I can't find them on our RT. I only find a schema.dot file in the docs directory of RT, but have no tool to open it. 

Could it be possible to get a pdf of these 2 files ? 

Thanks a lot, 
Regards, 
Elisabeth

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