[WSJF-5] Add cost tracking (OpenAI spend per email) #11

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opened 2026-06-27 10:45:50 +02:00 by bullitt · 0 comments

bullitt commented

2026-06-27 10:45:50 +02:00

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Context

Article reports $9 vs $200 cost differences between approaches. We have no visibility into AI costs.

Problem

No idea how much each AI extraction costs. Can't make informed decisions about when to use AI vs. not.

Proposal

Log token usage from OpenAI response (prompt_tokens, completion_tokens)
Store in events table or separate metrics table
Add to /api/stats: total_tokens_used, avg_tokens_per_extraction, estimated_cost
Surface in stats UI

WSJF: 5

## Context Article reports $9 vs $200 cost differences between approaches. We have no visibility into AI costs. ## Problem No idea how much each AI extraction costs. Can't make informed decisions about when to use AI vs. not. ## Proposal - Log token usage from OpenAI response (prompt_tokens, completion_tokens) - Store in events table or separate metrics table - Add to /api/stats: total_tokens_used, avg_tokens_per_extraction, estimated_cost - Surface in stats UI ## WSJF: 5