Fix 1 — Add `estimateRequestCost(request, model)` to PricingService (pricing.ts)
- Unified: estimateInputTokens + estimateOutputTokens + calculateWorkFeeUsd
- Replaces duplicated estimation in jobs.ts, sessions.ts, estimate.ts
Fix 2 — Sessions pre-gate: estimate → decide → execute → reconcile
- freeTierService.decide() runs on ESTIMATED cost BEFORE executeWork()
- Fixed double-margin: estimateRequestCost already includes infra+margin; convert directly
- absorbedSats capped at actual cost post-execution (Math.min)
Fix 3 — Correct isFree derivation for partial jobs in advanceJob() (jobs.ts)
- isFreeExecution = workAmountSats === 0 (not job.freeTier)
- Partial jobs run paid accounting: actual sats, refund, pool credit, deferred grant
Fix 4 — Defer ALL grant recording to post-work execution (jobs.ts)
- Fully-free path: removed recordGrant from eval time; now in runWorkInBackground
- For isFree jobs: absorbCap = actual post-execution cost (calculateActualChargeSats)
- For partial jobs: grant deferred from invoice creation to after work completes
Fix 5 — Atomic, pool-bounded grant recording with row locking (free-tier.ts)
- SELECT ... FOR UPDATE locks pool row inside transaction
- actualAbsorbed = Math.min(absorbSats, poolBalance) — pool can never go negative
- Daily absorption: SQL CASE expression atomically handles new-day reset
- Audit log and identity counter both reflect actualAbsorbed, not requested amount
- If pool is empty at grant time, transaction returns without writing
Fix 6 — Remove fire-and-forget from all recordGrant() call sites
- All three call sites now use await; failures propagate correctly
Fix 7 — Add migration 0005_free_tier.sql
- Creates timmy_config, free_tier_grants tables
- Adds nostr_identities.sats_absorbed_today / absorbed_reset_at columns
- Adds jobs.free_tier / absorbed_sats columns
- Adds sessions.nostr_pubkey FK column (for migration-driven deploys)
- All IF NOT EXISTS — safe to run on already-pushed DBs
Implement session-based API endpoints for creating, managing, and interacting with pre-funded sessions, including deposit and top-up invoice generation, macaroon authentication, and per-request debiting of compute costs.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 418bf6f8-212b-4bb0-a7a5-8231a061da4e
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 2dc3847e-7186-4a22-9c7e-16cd31bca8d9
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/9f85e954-647c-46a5-90a7-396e495a805a/418bf6f8-212b-4bb0-a7a5-8231a061da4e/sPDHkg8
Replit-Helium-Checkpoint-Created: true
## New files
- btc-oracle.ts: CoinGecko BTC/USD fetch (60s cache), usdToSats() helper (ceil, min 1 sat),
5s abort timeout, fallback to BTC_PRICE_USD_FALLBACK env var (default $100k)
- lib/db/migrations/0002_cost_based_pricing.sql: SQL migration artifact adding 6 new columns
to jobs table (estimated_cost_usd, margin_pct, btc_price_usd, actual_input_tokens,
actual_output_tokens, actual_cost_usd); idempotent via ADD COLUMN IF NOT EXISTS
## Modified files
- pricing.ts: Full rewrite — per-model token rates (Haiku/Sonnet, env-var overridable),
DO infra amortisation per request, originator margin %, estimateInputTokens/Output by tier,
calculateActualCostUsd() for post-work ledger, async calculateWorkFeeSats() → WorkFeeBreakdown
- agent.ts: WorkResult now includes inputTokens + outputTokens from Anthropic usage;
workModel/evalModel exposed as readonly public; EVAL_MODEL/WORK_MODEL env var support
- lib/db/src/schema/jobs.ts: 6 new real/integer columns; schema pushed to DB
- jobs.ts route: Work invoice creation calls pricingService.calculateWorkFeeSats() async;
stores estimatedCostUsd/marginPct/btcPriceUsd; post-work stores actualInputTokens/
actualOutputTokens/actualCostUsd; GET response includes pricingBreakdown and costLedger
with totalTokens (input + output computed field)
- openapi.yaml: PricingBreakdown + CostLedger schemas (with totalTokens) added
- lib/api-zod/src/generated/api.ts: Regenerated with new schemas
- lib/api-client-react/src/generated/api.schemas.ts: Regenerated (PricingBreakdown, CostLedger)
- replit.md: 17 new env vars documented in cost-based pricing section
