modified the notifications model. the sent_to is now a foreign key. now if we have a new type to be added, we can generate message and sub while creating notification. we can keep track of history using the role field in notification and task/sent_from

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import string,random

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def get_key():

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    """ return a 10 character random key.

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    """

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    return ''.join([ random.choice(string.uppercase+string.digits) for i in range(10)])

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