Add database#4

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Commits on Oct 25, 2024

ER-diagramm added

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ER-diagramm added. Remarks fixed

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Commits on Nov 4, 2024

SP12

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Commits on Nov 11, 2024

Postman passed

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Tests tested

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Checkstyle..

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Checkstyle..

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Commits on Nov 12, 2024