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Primary attributes need their own DB column
PRO: type-safe; indexable
CON:
userstable must be altered (manually)
Secondary/overflow attributes are stored as a key/value pair
PRO: no need to alter
userstableCON: searching is less efficient; not type-safe; max. length 512 characters
Table attributes need their own DB table
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Try the embedded H2 console to explore UM’s database structures:
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Attributes can be modified, custom attributes can be added: