Represent single word share with a separate table

[giobber]

Problem

At the moment Share link to Word in "tag" fashion. This works, but we lose information about frequency of a word inside a share (if present multiple times)

Solution

Add a new model called WordShare

class WordShare(...):
    word = ForeignKey(Word, ...)
    timestamp = models.DateTime(...)
    location = ...
    share = ForeignKey(...)

When a Share is added, instead of creating "Word tags" we can create single WordShare for each word found (timestamp and location come directly from Share, word is found via NLP)