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I have found the "pure SQL" answers to this question. Is there a way, in Rails, to reset the id field for a specific table?
Why do I want to do this? Because I have tables with constantly moving data - rarely more than 100 rows, but always different. It is up to 25k now, and there's just no point in that. I intend on using a scheduler internal to the Rails app (rufus-scheduler) to run the id field reset monthly or so.

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You never mentioned what DBMS you're using. If this is postgreSQL, the ActiveRecord postgres adapter has a reset_pk_sequences! method that you could use:

ActiveRecord::Base.connection.reset_pk_sequence!('table_name')

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