refactor(usage): usage readers use Effect FileSystem and SqlClient

[juliusmarminge]

The usage readers this stack moved (Antigravity, OpenCode, Cursor account usage) were still Node and Promise code: node:fs/promises, new DatabaseSync, timer-based yielding, async functions wrapped in Effect.promise, and file-wide nodeBuiltinImport:off headers. Their tests used module-level temp dirs with beforeEach/afterEach.

• Readers are Effect functions:
  • Files: discovery and reads go through FileSystem/Path.
  • Databases: each one opens read-only through the shared nodeSqliteClient, scoped per file, still with a 100 ms busy timeout.
  • Yielding: Effect.yieldNow replaces the timers.
• Cursor: credentials are read through FileSystem and Schema JSON, hashing uses effect/Crypto, and the dashboard is read through HttpClient like the usage-limits reader beside it. FetchHttpClient.RequestInit sets redirect: "error", so the session cookie stays on cursor.com. Pages requested ahead run as scoped fibers, so interrupting them aborts their requests. Tests stand in for Cursor with HttpClient.make.
• Tests: they use it.effect with scoped temp dirs and seed SQLite through SqlClient. Every case and assertion is kept.

User-visible output is unchanged. UsageService.test.ts passes unchanged.

Known differences:

• Rows are fetched all at once: the shared client uses .all() where the readers used .iterate(), so peak memory per table is higher.
• Antigravity transaction: its read now commits its read-only transaction rather than closing without one.
• One line-scoped Node import remains in the Antigravity reader and its test: node:fs/promises stat, because Effect's File.Info has no ctime, which the cache fingerprint needs.
• Out of scope: usageTranscriptReader.ts (stream-json), which predates this stack.

🤖 Generated with Claude Code (Claude Opus 5.5, Claude Code harness)

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This XL PR reimplements multiple production usage readers around Effect services, changing database loading, filesystem traversal, HTTP timeouts, cancellation, and credential handling. The rewritten tests cover the migrated paths, but the breadth and runtime/resource semantics require human review.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Codex	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Codex	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Codex	Live turn WebSocket decoded	—	20.9 KiB	—	29.3 KiB	✅
Codex	Live turn messages	—	2	—	8	✅
Claude	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Claude	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Claude	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Claude	Live turn WebSocket decoded	—	21.2 KiB	—	29.3 KiB	✅
Claude	Live turn messages	—	2	—	8	✅

Baseline: unavailable · PR result: 91f2428 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

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• packages/provider-opencode/src/server/usage.ts

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📝 Walkthrough

Walkthrough

Three usage readers now use Effect APIs and services for filesystem and database operations. Cursor account usage also uses Effect-based credential, crypto, and paginated request workflows. The related tests use Effect-managed setup.

Changes

Antigravity usage reader

Layer / File(s)	Summary
Database reading and candidate construction apps/server/src/provider/Drivers/antigravityUsageReader.ts	Database reads use Effect SQL and build candidates with the existing usage, model, timestamp, and deduplication rules.
Discovery, cache, and tests apps/server/src/provider/Drivers/antigravityUsageReader.ts, apps/server/src/provider/Drivers/AntigravityUsage.ts, apps/server/src/provider/Drivers/antigravityUsageReader.test.ts	Directory traversal and database reads use Effect services. Symlinks are excluded, and the scan call site provides the required services. Tests retain coverage for usage records, caching, malformed databases, and WAL updates.

Cursor account usage

Layer / File(s)	Summary
Credential access and request preparation packages/provider-cursor/src/server/accountUsage.ts	Credential reads, JSON decoding, and account hashing use Effect services. Credential and validation failures use typed Effect errors.
Pagination, reconciliation, and integration packages/provider-cursor/src/server/accountUsage.ts, packages/provider-cursor/src/server/CursorAccountReader.ts, packages/provider-cursor/src/server/accountUsage.test.ts	Dashboard requests use the Effect HTTP client and scoped page fibers. The reader integration and tests provide Effect services and cover pagination, ordering, errors, and cancellation.

OpenCode usage reader

Layer / File(s)	Summary
Database and legacy usage reading packages/provider-opencode/src/server/usage.ts, packages/provider-opencode/src/server/usage.test.ts	Database discovery, SQLite reads, and legacy JSON traversal use Effect services. Symlinks are excluded, and the test uses Effect-managed filesystem and SQLite setup.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Refactor

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Merge Risk: ⚪ Minimal · up to 91f24

The previously identified database-discovery issue is fixed. No actionable merge blocker remains in the supplied review scope.

Pre-merge checks | 3 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check		The description explains the problem and implementation changes, but it omits the required Scope and approval section and does not provide sufficient verification details or observed results for the f…	Add explicit Problem, Change, Scope and approval, and Verification sections. Include the linked issue or maintainer approval, explain why any approval exemption applies, list the focused test commands, report their observed results, and sta…

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check		The title clearly identifies the main change: migrating usage readers to Effect FileSystem and SqlClient services.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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The description explains the problem and implementation changes, but it omits the required Scope and approval section and does not provide sufficient verification details or observed results for the focused tests.

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Add explicit Problem, Change, Scope and approval, and Verification sections. Include the linked issue or maintainer approval, explain why any approval exemption applies, list the focused test commands, report their observed results, and state any checks not run.

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Actionable comments posted: 1

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🤖 Prompt to fix review comments

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Inline comments:
Review comments at @packages/provider-opencode/src/server/usage.ts:
- Line 128: Handle NotFound within the per-candidate filter around entryType so
a database that disappears after readDirectory is skipped without replacing the
full database list. Preserve existing handling for other errors and continue
scanning the remaining candidates.

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📥 Commits

Reviewing files that changed from the base of the PR and between f99db8a and cc4372a.

📒 Files selected for processing (8)

• apps/server/src/provider/Drivers/AntigravityUsage.ts
• apps/server/src/provider/Drivers/antigravityUsageReader.test.ts
• apps/server/src/provider/Drivers/antigravityUsageReader.ts
• packages/provider-cursor/src/server/CursorAccountReader.ts
• packages/provider-cursor/src/server/accountUsage.test.ts
• packages/provider-cursor/src/server/accountUsage.ts
• packages/provider-opencode/src/server/usage.test.ts
• packages/provider-opencode/src/server/usage.ts

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