I have a diagram for a database made to orgnize the data of a group of pepole.
The database is meant to serve a website for now, but will also be used for mobile applications in the near future.
Additional information
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People have lessons they have to attend and there is a fingerprint to insure that
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The most important thing in the data is the price of electricity, which increases by a certain amount manually every 4 months
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There is also insurance of a certain value - if something is violated, the insurance is deducted
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a notification can be sent from admin to clients(pepole) individually or collectively (in a future update)
this is my first time building a database diagram, so
I need your comments on my diagram of the project 