ARTEX

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BaaRai 67ff6ffffa feat: cost ledger (per-profile EUR pricing on token usage)

The token metering is real now (input, output, cache read/write per
profile), but it answers "how many tokens" while the question an operator
actually asks is "what did this run cost". Converting requires per-profile
prices, which nowhere exist.

Changes:
- llm_profiles gains four optional price columns (EUR per 1M tokens:
  input, output, cache read, cache write; 0/NULL = unset), migrated
  idempotently and round-tripped through SaveProfile / the profile API
  in one small auditable write
- the usage aggregation computes cost_eur per profile from the stored
  prices, in Go after the archived-task merge so cold-storage tokens are
  priced identically; profiles without prices keep cost_eur nil instead
  of showing a fake zero
- web types carry cost_eur and the price fields; the dashboard card and
  profile-dialog inputs consume them in a follow-up (the API serves the
  data already)
- integration test: priced profile + usage rows -> expected EUR to the
  cent (2M in @1.5 + 0.5M out @4 + 1M cache-read @0.15 = 5.15), plus a
  prices round-trip check

Note: the Go side activates on the next build; the schema migration is
idempotent at startup.

2026-10-12 08:20:37 +02:00