lightning: add custom transaction notes

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📝 Walkthrough

Walkthrough

The change adds account-specific storage for Lightning payment notes and includes those notes in payment data. It adds a backend endpoint to save notes, and extends note import and export for configured Lightning accounts. The web interface can edit payment notes and displays them in transaction views. Notes settings are available when a Lightning account is enabled, even if no other accounts exist.

Priority: ⬇️ Low

Merge Risk: 🟡 Moderate · up to 15b88

Fix these issues before merging: an unreadable notes file can hide Lightning transaction history and interfere with top-up recovery, while failed note saves can lose edits without warning.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 15b88

Authentication remains in place, but wallet identity is not fixed throughout note transfers, creating a risk of misattributed notes during overlapping wallet changes. A damaged notes file can also prevent payment history from loading. The demonstrated scope is local wallet metadata, not payment-signing authority.

Retained concerns

• Medium · security · inferred: Note transfers do not bind account identity across validation and use. If the configured wallet changes between these steps, import can validate an entry for wallet A but write it into wallet B, and export can label wallet B’s notes with wallet A’s account code. Account-keyed caching protects sequential access but does not prevent this interleaving.
• Low · reliability · inferred: Optional note storage is now a hard dependency of payment-history retrieval. On cache load or restart, a malformed or interrupted note file causes ListPayments to discard otherwise assembled payment results. The truncating writer predates this PR, but this coupling newly extends its failure scope beyond note persistence.

Security review details

Security Blast Radius

• inferred — The inspected mutation path affects local payment-note files, exported labels, and displayed payment metadata. The account-transition scenario concerns wallets managed by the same application and requires existing API authority or an authorized import/export operation overlapping a wallet change. No new signing or spending call appears in this path.

Security Findings and Attack Paths

• inferred — An import can match wallet A’s account code, then call SetTxNote after activation has selected wallet B; Notes then selects B’s file. Export has the inverse attribution hazard because its account tag and note store are selected separately. These are source-supported interleavings, not demonstrated unauthenticated exploits.

Trust Boundaries and Controls

• observed — The new route uses the existing API wrapper, which rejects missing or incorrect production authorization tokens before handler execution. Development mode intentionally permits unauthorized requests. The request body cannot directly select another account’s note file; file ownership is derived from the configured Lightning account.

Hardening Proposals

• proposed — Bind the expected account code and note-store handle together for each transfer, and reject or serialize account changes across identity validation and use. This would preserve ownership through concurrent wallet transitions.
• proposed — Contain optional note-load failures separately from payment-history retrieval. Staged in-memory updates and atomic file replacement would also strengthen the inherited persistence behavior without treating it as a newly introduced vulnerability.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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Actionable comments posted: 2

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @backend/lightning/payments.go:
- Line 1304: Update getListPayments so an error from lightning.Notes() is logged
without discarding the payments already retrieved; return those payments with
empty notes when note enrichment fails. Keep errors from saving notes visible.

Review comments at
@frontends/web/src/components/transactions/components/tx-detail-dialog/note.tsx:
- Line 34: Update the note-save handler in the component containing the
Lightning save callback to store failures in error state and render that error
near the note input. Clear the error when the user edits the note or retries
saving, while preserving the entered text on failure.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 66ea70a9-81e1-4fbb-8533-5fdf6e71fe6a

📥 Commits

Reviewing files that changed from the base of the PR and between 16d4b17 and 15b8810.

📒 Files selected for processing (18)

• CHANGELOG.md
• backend/lightning/handlers.go
• backend/lightning/lightning.go
• backend/lightning/notes.go
• backend/lightning/payments.go
• backend/lightning/payments_test.go
• backend/notes.go
• frontends/web/src/api/lightning.ts
• frontends/web/src/components/transactions/components/tx-detail-dialog/note.tsx
• frontends/web/src/components/transactions/components/tx-detail-dialog/tx-detail-dialog.tsx
• frontends/web/src/locales/en/app.json
• frontends/web/src/routes/lightning/claim-top-up/claim-top-up.test.tsx
• frontends/web/src/routes/lightning/components/payment-details.tsx
• frontends/web/src/routes/lightning/lightning.test.tsx
• frontends/web/src/routes/lightning/lightning.tsx
• frontends/web/src/routes/settings/general.tsx
• frontends/web/src/routes/settings/settings-availability.ts
• frontends/web/src/routes/settings/settings-search.ts

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