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# Progress Log
# Powered by ArchonDev - AI Development Governance by Jumping Ahead Corp.
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# This is an APPEND-ONLY log of learnings from each development iteration.
# AI assistants read this file at the start of each session to learn from
# past work. Never delete entries - only add new ones at the bottom.
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# Format for each entry:
#   ## [DATE] - [Atom/Task ID] - [Brief Title]
#   ### What was done
#   ### Learnings
#   ### Files modified
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## 2026-01-15 - ATOM-000 - Project Initialization

### What was done
- Initialized project with npm init
- Set up TypeScript configuration with strict mode
- Created initial folder structure: src/cli, src/core, src/api, src/db
- Added ESLint and Prettier configuration
- Created ARCHITECTURE.md with initial component definitions

### Learnings
- TypeScript `noUncheckedIndexedAccess` catches array boundary issues early
- Putting ESLint and Prettier configs in package.json reduces root clutter
- ARCHITECTURE.md YAML frontmatter parses cleanly with gray-matter library

### Files modified
- package.json
- tsconfig.json
- ARCHITECTURE.md
- src/cli/index.ts (placeholder)
- src/core/index.ts (placeholder)


## 2026-01-16 - ATOM-001 - Add User Authentication Endpoint

### What was done
- Created POST /api/auth/login endpoint
- Implemented JWT token generation
- Added input validation for email/password
- Created unit tests for success and failure cases

### Learnings
- bcrypt.compare is async - don't forget to await
- JWT expiry should be configurable via environment variable
- Response wrapper pattern (apiResponse) keeps API responses consistent
- Never log the password even in debug mode (invariant SEC-001)

### Files modified
- src/api/auth.ts (new)
- src/api/index.ts
- src/api/auth.test.ts (new)
- src/utils/auth.ts


## 2026-01-17 - ATOM-002 - Database Connection Pooling

### What was done
- Configured database connection pool
- Added health check endpoint that verifies DB connectivity
- Implemented graceful shutdown for connections

### Learnings
- Connection pool size should match expected concurrency (default 10 is fine for dev)
- Health check should have its own dedicated connection, not use pool
- Graceful shutdown needs both SIGTERM and SIGINT handlers
- The db component is INFRASTRUCTURE boundary - other layers use abstraction

### Files modified
- src/db/client.ts
- src/db/pool.ts (new)
- src/api/health.ts
- src/index.ts (shutdown handlers)


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