User
    -id
    -name
    -email
    -hashedpassword
    --salt
    -readonly
    -administrator
    -map
    -language
    -distanceunit
    -speedunit
    -latitude
    -longitude
    -zoom

Devices
    -id
    -name
    -uniqueid
    status
    -lastupdate
    -postionid

positions
    -id
    -protocol
    -deviceid
    -servertime
    -devicetime
    -fixtime
    -valid
    -latitude
    -longitude
    -altitude
    -speed
    -course
    -address
    -attributes