You have to read thoroughly how to code for the one-to-many in
bigtable implementation.
Instead of fluffing all the content in one column, use that column to
hold an object which fluffs the given objects into it. (Object of
Objects, a list in python, a collection in Java.)

When code, you can say, "my_object.that_list". (After getting the
my_object through GQL )
Which will give you no worry over queries per second and the likes.
The whole operation would be atomic, as we should group the objects in
subject with 'parent-child' concepts.

But Phil, You may have to forget RDBMS if you wish to use Bigtable and
vice-versa.

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