[FEAT] Reformat LéXPLORE metadata

[hsolleder]

Linked to #17, which goes ahead with the simple approach, a more sophisticated take on the LéXPLORE metadata would be to store all of the information, namely

• Start of the maintenance phase and instrument
• Maintenance step performed and serial number
• Calibration values for each calibrated instrument
• End of the maintenance phase
  In a structured way. This could be achieved by restructuring the data and adapting the database schema to store this, e.g.

erDiagram
    MAINTENANCE ||--|{ STEP : contains

    MAINTENANCE {
        datenum start
        datenum end
        string instrument
    }
    STEP {
        datenum start
        datenum end
        int serialNumber
        float calibrationValue
    }

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