test(indexer): add integration test for indexer resume from checkpoint after restart

[omoh5]

Summary

Resolves #667 — adds an integration test that proves the indexer resumes from checkpoint.ledger + 1 after a simulated restart, and that no ledgers below the resume point are reprocessed.

The test (src/modules/indexer/indexer-resume.integration.test.ts) writes checkpoint records into the real ledgerCheckpoint table, calls getResumePoint() to simulate the indexer on-startup behaviour, and asserts both the resume-point value and the post-restart write boundary.

Acceptance Criteria Coverage

Criterion	Test
Indexer resumes from ledger 5001 after checkpoint at 5000	writes a checkpoint for ledger 5000 and resumes from ledger 5001 after restart
No ledgers below 5001 are reprocessed	after restart at checkpoint 5000, pre-existing activity rows are untouched and only events at ledgers ≥ 5001 are written
Resume ledger read from the checkpoint table, not hardcoded	returns ledger + 1 for a checkpoint at non-5000 ledger (9999 → 10_000)
Test passes when the checkpoint table has multiple records (most recent is used)	selects the highest ledger record and returns ledger + 1 (100, 2000, 5000 → resume 5001)

Design notes

• Real Prisma DB throughout — mirrors the existing ledger-checkpoint.integration.test.ts pattern.
• jest.spyOn (not jest.mock) scopes mocks to read-model operations processTradeEvents touches (activity, keyOwnership, creatorPriceSnapshot, indexedLedger). The real ledgerCheckpoint connection stays intact and is the unit under test.
• processTradeEvents does not filter input events by ledger (the gating happens upstream, in the indexer polling loop). The test mirrors that contract explicitly in comments and feeds the function only events ≥ the resume point. The strongest contract assertion is the resume-point value itself (verified across 3 distinct ledger values).

Running locally

pnpm db:up                                                              # start docker compose postgres
pnpm exec prisma db push                                                # apply schema
DATABASE_URL=postgresql://postgres:postgres@localhost:5432/accesslayer \\
  pnpm exec jest src/modules/indexer/indexer-resume.integration.test.ts

Expected: Tests: 5 passed, 5 total.

Testing

• pnpm exec jest src/modules/indexer/indexer-resume.integration.test.ts — 5/5 tests pass locally against a Postgres test instance
• pnpm exec tsc --noEmit — clean
• pnpm lint — clean (test-only change, no production source touched)
• pnpm build — N/A (test-only change)
• pnpm exec prisma generate — no schema change

Checklist

• Linked issue (Add integration test for indexer resuming from the correct ledger after a simulated restart #667)
• No secrets or live credentials added
• Change is scoped to one problem (the resume-from-checkpoint contract)

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