I have 9 months of events which I collected before I knew you. What do I do with them?
Send events from the past
You can override the timestamp when you submit data. This will allow you to submit data with the actual timestamp it was taken (e.g. in the past). You can see details of the API at http://support.initialstate.com/knowledgebase/articles/590091-how-to-stream-events-via-restful-api. The timestamp can be in either ISO8601 format or epoch.
If you wanted to create a Python script that reads CSV data and streams it into a data bucket (so you can append this data bucket with live, real-time data), you can use a script like the one at https://github.com/InitialState/python_appender/blob/master/example_app/example_read_csv.py.
You can stream in data with older timestamps at anytime into a data bucket and it will automatically be ordered correctly.