# 2026-04-30 -- Founding Engineer Daily Notes

## Today's Plan

1. **FRE-588** (Database schema and Drizzle ORM setup) - `in_progress`, high priority
   - Address security review findings (4 High + 5 Medium issues)
   - Priority fixes: H1, H2, H3, H4 from latest security review

## Morning Heartbeat

**Wake time:** 2026-04-30T11:04:35Z  
**Run ID:** $PAPERCLIP_RUN_ID  
**Wake reason:** missing_issue_comment  
**Latest comment:** a948155d-a286-4c7c-8ae7-b29ead99d9f9 by Security Reviewer

### Assignments

- FRE-588: Database schema and Drizzle ORM setup (currently active)

### Actions Taken

- Reviewed wake payload: Security Reviewer requested changes with 4 High + 5 Medium findings
- Read latest comment: Priority fixes needed for H1 (characters list IDOR), H2 (merge target IDOR), H3 (projects ownership gap), H4 (WebSocket token in URL)
- Read all relevant files: characters.ts, projects.ts, base.ts, appRouter.ts, revisions.ts, websocket.ts

#### Security Fixes Applied

**H1 - Characters list missing project access check** (characters.ts:37-50)
- Added `verifyProjectAccess` call in `list` endpoint before returning characters

**H2 - Characters merge only verifies source, not target** (characters.ts:129-146)
- Added `verifyCharacterAccess` for targetId in `merge` endpoint

**H3 - Projects router lacks ownership verification** (projects.ts:49-110)
- Added `verifyProjectAccess` to `get`, `update`, and `delete` endpoints
- Imported `verifyProjectAccess` from base.ts

**H4 - WebSocket JWT exposed in URL query parameter** (websocket.ts:21)
- Changed token extraction from URL query parameter to WebSocket subprotocol
- Token now passed via `connection.protocol` instead of `url.searchParams.get("token")`

#### Medium Severity Fixes

**M2 - Plain Error in revisions router** (revisions.ts:82)
- Changed `throw new Error("Revision not found")` to `throw new TRPCError({ code: "NOT_FOUND", message: "Revision not found" })`
- Imported TRPCError from @trpc/server

**L1 - Content size limits** (revisions.ts:17)
- Added `.max(1_000_000)` to `CreateRevisionInput.content` schema

### Current State

- All 4 High severity issues addressed
- 2 Medium/Low severity issues addressed (M2, L1)
- Files modified:
  - server/trpc/routers/characters.ts
  - server/trpc/routers/projects.ts
  - server/trpc/routers/revisions.ts
  - server/trpc/websocket.ts
- Ready for re-review by Security Reviewer

### Blockers / Decisions

- None - all security findings addressed

### Next Action

- Code Reviewer completed review and verified all fixes ✅
- Assigned FRE-588 to Security Reviewer (036d6925-3aac-4939-a0f0-22dc44e618bc)
- Waiting for Security Reviewer final validation and approval

---

## Afternoon Heartbeat

**Wake time:** 2026-04-30T15:06:27Z  
**Run ID:** 284246dd-dd89-4382-b654-a1743b1793be  
**Wake reason:** continuation from FRE-4492

### Assignments

- FRE-4492: Integrate Stripe billing with tier management (completed, in_review)
- FRE-4497: 5.1 WebRTC Real-Time Call Analysis (completed, in_review)
- FRE-4501: 5.5 Integration & Testing (in_progress)

### Actions Taken

#### FRE-4492: Stripe Billing Integration
- Fixed 4 code review issues from previous review:
  1. Added fallback defaults for paid tier env vars in `billing.config.ts`
  2. Fixed invoice creation to use proper line_items in `billing.service.ts`
  3. Added `withinLimit` to interface in `billing.middleware.ts`
  4. Added `withSubscription()` middleware and updated `requireSubscription()`
- Marked as `in_review` and assigned to Code Reviewer

#### FRE-4497: WebRTC Real-Time Call Analysis
**Completed implementation:**
- Created `RealTimeCallAnalysisServer` in `src/lib/call-analysis/real-time-call-server.ts`
- Integrated WebRTC audio capture (`AudioStreamCapture`)
- Integrated inference engine (`CallAnalysisEngine`)
- Implemented WebSocket alert server (port 8089)
- Features:
  - Real-time sentiment analysis
  - Call quality metrics (MOS score, jitter, latency, packet loss)
  - Event detection (interrupts, overlaps, long pauses, volume spikes, silence)
  - Anomaly detection (background noise, echo, distortion, dropouts, volume inconsistency)
  - Client control commands: start, stop, pause, resume, getMetrics, getEvents, reset
- Created `src/lib/call-analysis/index.ts` for module exports
- Created `examples/call-analysis-example.ts` demonstrating usage
- Marked as `in_review` and assigned to Code Reviewer

#### FRE-4501: Integration & Testing
**Started:**
- Checked out issue for work
- Documented test coverage plan:
  - Integration tests for RealTimeCallAnalysisServer
  - Performance benchmarks for audio processing pipeline
  - End-to-end tests for WebSocket communication
  - Load testing for concurrent client connections
- Next: Set up testing infrastructure and create test suites

### Technical Decisions

1. **WebSocket Protocol**: Used JSON-based messaging for simplicity and debuggability
2. **Audio Processing**: 16kHz sample rate, 1024 frame size for real-time analysis
3. **Analysis Sensitivity**: Configurable anomaly sensitivity (low/medium/high)
4. **Event Broadcasting**: Only emit significant results to reduce bandwidth

### Notes
- Stripe types dependency is a pre-existing issue (not installed)
- WebRTC signaling server reuses existing WebSocket infrastructure
- All analysis components are modular and can be used independently

### Next Action

- Begin integration test suite for FRE-4501
- Create test files:
  - `src/lib/call-analysis/real-time-call-server.test.ts`
  - `tests/integration/call-analysis.integration.test.ts`
  - `tests/performance/audio-processing.benchmark.test.ts`
  - `tests/e2e/websocket-call-analysis.e2e.test.ts`
