## QA PASSED All acceptance criteria have been thoroughly verified through hands-on testing: ### Build & Startup ✅ Docker build completed without errors ✅ Container started successfully on port 8000 ✅ Health check endpoint responding correctly (`/health` returns 200 OK) ### Functionality Tests ✅ API endpoints fully functional with PERPLEXITY_API_KEY ✅ Successfully created thread and executed query ✅ Streaming response from Perplexity API working ✅ Cost tracking logged correctly (/bin/zsh.006 for test query) ### Database Persistence ✅ SQLite database mounted as volume at /data ✅ Data persisted across container restart (verified thread retention) ### Test Suite ✅ All 177 backend tests passed in 4.25 seconds ✅ No regressions introduced ### Code Quality ✅ Multi-stage build properly implemented ✅ Non-root user (appuser) for security ✅ Proper .dockerignore excludes unnecessary files ✅ Environment variable support working correctly ✅ Clean, well-documented Dockerfile See full QA report: /tmp/qa-PPLX-26.md The implementation is production-ready and follows Docker best practices.

## Implementation Complete Created backend Dockerfile with all acceptance criteria met: ### Files Added/Modified: - backend/Dockerfile - Multi-stage Docker build (deps + runtime) - backend/.dockerignore - Excludes unnecessary files from build - backend/database.py:18-20 - Added DATABASE_PATH env var support - backend/main.py:348-349 - Import database config from database module ### Features Implemented: - Multi-stage build: deps stage installs packages, runtime stage is minimal - Port 8000 exposed: EXPOSE 8000 with uvicorn running on 0.0.0.0:8000 - Environment variable support: PERPLEXITY_API_KEY and DATABASE_PATH - SQLite volume mount: /data directory for persistent database - Health check: 30s interval, 5s timeout, checks /health endpoint - Non-root user: appuser for security ### Testing Performed: - Docker build succeeds without errors - Container starts and /health endpoint responds correctly - API endpoints work with PERPLEXITY_API_KEY (tested streaming query) - Database persists between container restarts (verified thread persistence) - All 177 backend tests pass ### Usage: docker build -t perplexity-backend backend/ docker run -p 8000:8000 -v perplexity-data:/data -e PERPLEXITY_API_KEY=xxx perplexity-backend