Avoiding huge IDs after deleting data

I have a Django/PostgreSQL application to analyze data from tweets. The dataset increases by thousands of records with each request. I am using the database primarily as a relational cache, so I had planned to delete all records every 24 hours to permit new requests, without needlessly increasing the size of the database.

However, because the Django ORM uses the SERIAL data type to store the IDs in the DB; the IDs get larger, even when all existing records have been deleted. Eventually, I will run out of key space. What can I do to make Django produce smaller ID values?

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