Pixel document schema

https://docs.google.com/spreadsheets/d/1Cf_F4_ufK43OfbqZgwBctRAg1wmTGshlwEvYbOSd2to/edit#gid=0

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_v (int), the json document's schema version.

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uid (string) contains an uuid string acting as the pixel's unique identifier.

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classification (string) value as:

• none - a todo item, a card on a mindmap, etc.
• event - a calendar entry
• journal - a work/life log entry
• task - well, a task
• project - a set of the above mentioned
• (budget) - 💡 in consideration

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