## What was built
### DB schema
- `timmy_config` table: key/value store for the generosity pool balance
- `free_tier_grants` table: immutable audit log of every Timmy-absorbed request
- `jobs.free_tier` (boolean) + `jobs.absorbed_sats` (integer) columns
### FreeTierService (`lib/free-tier.ts`)
- Per-tier daily sats budgets (new=0, established=50, trusted=200, elite=1000)
— all env-var overridable
- `decide(pubkey, estimatedSats)` → `{ serve: free|partial|gate, absorbSats, chargeSats }`
— checks pool balance AND identity daily budget atomically
- `credit(paidSats)` — credits POOL_CREDIT_PCT (default 10%) of every paid
work invoice back to the generosity pool
- `recordGrant(pubkey, reqHash, absorbSats)` — DB transaction: deducts pool,
updates identity daily absorption counter, writes audit row
- `poolStatus()` — snapshot for metrics/monitoring
### Route integration
- `POST /api/jobs` (eval → work flow): after eval passes, `freeTierService.decide()`
intercepts. Free → skip invoice, fire work directly. Partial → discounted invoice.
Gate (anonymous/new tier/pool empty) → unchanged full-price flow.
- `POST /api/sessions/:id/request`: after compute, free-tier discount applied to
balance debit. Session balance only reduced by `chargeSats`; absorbed portion
comes from pool.
- Pool credited on every paid work completion (both jobs and session paths).
- Response fields: `free_tier: true`, `absorbed_sats: N` when applicable.
### GET /api/estimate
- Lightweight pre-flight cost estimator; no payment required
- Returns: estimatedSats, btcPriceUsd, tokenEstimate, identity.free_tier decision
(if valid nostr_token provided), pool.balanceSats, pool.dailyBudgets
### Tests
- All 29 existing testkit tests pass (0 failures)
- Anonymous/new-tier users hit gate path correctly (verified manually)
- Pool seeds to 10,000 sats on first boot
## Architecture notes
- Free tier decision happens BEFORE invoice creation for jobs (save user the click)
- Partial grant recorded at invoice creation time (reserves pool capacity proactively)
- Free tier for sessions decided AFTER compute (actual cost known, applied to debit)
- Pool crediting is fire-and-forget (non-blocking)
- resolveNostrPubkey() now returns { pubkey, rejected } instead of string|null
so invalid/expired tokens return 401 instead of silently falling to anonymous
- POST /sessions and POST /jobs: return 401 if nostr_token header/body is
present but invalid or expired
- POST /identity/verify: now accepts optional top-level 'pubkey' field alongside
'event'; asserts pubkey matches event.pubkey if both are provided — aligns
API contract with { pubkey, event } spec shape and hardens against mismatch
- sessions.ts / jobs.ts schema: add .references(() => nostrIdentities.pubkey) FK constraints
on nostrPubkey columns; import without .js extension for drizzle-kit CJS compat
- Schema pushed to DB (FK constraints now enforced at DB level)
- sessions route: call getOrCreate before insert to guarantee FK target exists;
recordFailure now covers both 'rejected' AND 'failed' final states
- jobs route: call getOrCreate before insert; recordFailure added in
runEvalInBackground for rejected and failed states; recordFailure added in
runWorkInBackground catch block for failed state
- All GET/POST endpoints now always return trust_tier (anonymous fallback)
- Full typecheck clean; schema pushed; smoke tested — all routes green
- New nostr_identities DB table (pubkey, trust_score, tier, interaction_count, sats_absorbed_today, last_seen)
- nullable nostr_pubkey FK on sessions + jobs tables; schema pushed
- TrustService: getTier, getOrCreate, recordSuccess/Failure, HMAC token (issue/verify)
- Soft score decay (lazy, on read) when identity absent > N days
- POST /api/identity/challenge + POST /api/identity/verify (NIP-01 sig verification)
- GET /api/identity/me — look up trust profile by X-Nostr-Token
- POST /api/sessions + POST /api/jobs accept optional nostr_token; bind pubkey to row
- GET /sessions/:id + GET /jobs/:id include trust_tier in response
- recordSuccess/Failure called after session request + job work completes
- X-Nostr-Token added to CORS allowedHeaders + exposedHeaders
- TIMMY_TOKEN_SECRET set as persistent shared env var
Task #25: Provision LNbits on Hermes VPS for real Lightning payments.
Changes:
- dev.ts: /dev/stub/pay/:hash now works in both stub and real LNbits modes.
In real mode, looks up BOLT11 from invoices/sessions/bootstrapJobs tables
then calls lnbitsService.payInvoice() (FakeWallet accepts it).
- sessions.ts: Remove all stubMode conditionals on paymentHash — always expose
paymentHash in invoice, pendingTopup, and 409-conflict responses.
- jobs.ts: Remove stubMode conditionals on paymentHash in create, GET awaiting_eval,
and GET awaiting_work responses.
- bootstrap.ts: Remove stubMode conditionals on paymentHash in POST create and
GET poll responses. Simplify message field (no longer mode-conditional).
- Hermes VPS: Funded LNbits wallet with 1B sats via DB credit so payInvoice
calls succeed (FakeWallet checks wallet balance before routing).
Result: 29/29 testkit PASS in real LNbits mode (LNBITS_URL + LNBITS_API_KEY set).
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.
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