Pino Structured Logging Implementation

January 21, 20267:50 PM – 8:45 PM(55 min)4 turns

Model: claude-opus-4-5-20251101

Edit46Read18Bash14TodoWrite7Write7Task4Glob2AskUserQuestion2ExitPlanMode1

7:50 PM

Implement the following plan:

Pino Structured Logging Implementation

Summary

Replace console.log/error/warn with Pino structured logging across apps/api and apps/mail, and create K8s log streaming scripts with pretty-printing.

1. Create `packages/logger`

File Structure

packages/logger/
├── src/
│   └── index.ts
├── package.json
├── tsconfig.json
└── eslint.config.js

package.json

{
  "name": "@repo/logger",
  "version": "2026.1.0",
  "private": true,
  "type": "module",
  "exports": {
    ".": "./src/index.ts"
  },
  "dependencies": {
    "pino": "9.6.0"
  },
  "devDependencies": {
    "pino-pretty": "13.0.0",
    "@types/node": "22.13.4"
  }
}

src/index.ts

import pino from "pino";

const isDev = process.env.NODE_ENV === "development";

export const logger = pino({
  level: process.env.LOG_LEVEL || "info",
  transport: isDev
    ? { target: "pino-pretty", options: { colorize: true } }
    : undefined,
  formatters: {
    level: (label) => ({ level: label }),
  },
  timestamp: pino.stdTimeFunctions.isoTime,
});

export function createLogger(name: string) {
  return logger.child({ name });
}

export type Logger = pino.Logger;

2. Update `apps/api`

Changes to `apps/api/src/index.ts`

import { createLogger } from "@repo/logger";

const log = createLogger("api");

// Replace console.log -> log.info
// Replace console.error -> log.error
// Replace console.warn -> log.warn

Files to Update

src/index.ts - startup, shutdown logging
src/startup/ingest-content.ts - content indexing
src/services/canvas-sync.ts - sync job
src/routes/chat.ts - stream errors
src/middleware/auth.ts - auth errors

3. Update `apps/mail`

Changes to `apps/mail/src/index.ts`

import { createLogger } from "@repo/logger";

const log = createLogger("mail");

Files to Update

src/index.ts - startup, shutdown
src/server.ts - SMTP connection logging
src/processor.ts - message processing
src/sender.ts - relay logging
src/logger.ts - DB logging failures

4. Create Log Streaming Scripts

bin/logs-dev

#!/bin/bash
set -euo pipefail

DEPLOYMENT="${1:-}"
NAMESPACE="usingandunderstandingai"

if [ -z "$DEPLOYMENT" ]; then
  echo "Usage: logs-dev <deployment>"
  echo "Examples: logs-dev dev-api, logs-dev dev-mail, logs-dev dev-web"
  exit 1
fi

kubectl logs -f "deploy/$DEPLOYMENT" -n "$NAMESPACE" | bunx pino-pretty

bin/logs-prod

#!/bin/bash
set -euo pipefail

DEPLOYMENT="${1:-}"
NAMESPACE="usingandunderstandingai"

if [ -z "$DEPLOYMENT" ]; then
  echo "Usage: logs-prod <deployment>"
  echo "Examples: logs-prod api, logs-prod mail, logs-prod web"
  exit 1
fi

kubectl logs -f "deploy/$DEPLOYMENT" -n "$NAMESPACE" | bunx pino-pretty

Files to Create/Modify

File	Action
`packages/logger/package.json`	Create
`packages/logger/tsconfig.json`	Create
`packages/logger/eslint.config.js`	Create
`packages/logger/src/index.ts`	Create
`apps/api/package.json`	Add @repo/logger dependency
`apps/api/src/index.ts`	Replace console.* with logger
`apps/api/src/startup/ingest-content.ts`	Replace console.* with logger
`apps/api/src/services/canvas-sync.ts`	Replace console.* with logger
`apps/api/src/routes/chat.ts`	Replace console.* with logger
`apps/api/src/middleware/auth.ts`	Replace console.* with logger
`apps/mail/package.json`	Add @repo/logger dependency
`apps/mail/src/index.ts`	Replace console.* with logger
`apps/mail/src/server.ts`	Replace console.* with logger
`apps/mail/src/processor.ts`	Replace console.* with logger
`apps/mail/src/sender.ts`	Replace console.* with logger
`apps/mail/src/logger.ts`	Replace console.* with logger
`bin/logs-dev`	Create
`bin/logs-prod`	Create

Implementation Order

Create packages/logger with Pino configuration
Run bun install to link the new package
Update apps/api files to use logger
Update apps/mail files to use logger
Create bin/logs-dev and bin/logs-prod scripts
Test locally with bun dev
Build and deploy updated containers

Verification

Run bun dev - verify pretty-printed logs in terminal
Run bin/logs-dev dev-api - verify streaming works with pretty output
Check raw JSON in K8s: kubectl logs deploy/dev-api -n usingandunderstandingai (should be JSON)
Verify log levels work: set LOG_LEVEL=debug and confirm debug messages appear

If you need specific details from before exiting plan mode (like exact code snippets, error messages, or content you generated), read the full transcript at: ~/.claude/projects/-Users-challen-www-usingandunderstanding-ai/774c2830-2651-4b2b-8f9e-18b8f0a83a77.jsonl

I'll implement the Pino structured logging plan. Let me start by creating a todo list to track progress.

Let me first look at an existing package structure for reference.

Now I'll create the packages/logger directory and files.

Let me read the apps/api and apps/mail package.json files to add the logger dependency.

Now I'll update the apps/api files to use the logger. I'll start with the index.ts file.

Now I'll update the apps/mail files. Starting with index.ts.

The Pino structured logging implementation is complete. Here's what was done:

Created packages/logger:

package.json with pino and pino-pretty dependencies
tsconfig.json and eslint.config.js following existing package patterns
src/index.ts with Pino configuration that outputs pretty logs in development and JSON in production

Updated apps/api:

src/index.ts - startup, shutdown, error handling
src/startup/ingest-content.ts - content indexing
src/services/canvas-sync.ts - sync job logging
src/routes/chat.ts - stream errors
src/middleware/auth.ts - auth errors

Updated apps/mail:

src/index.ts - startup, shutdown
src/server.ts - SMTP connection logging
src/processor.ts - message processing
src/sender.ts - relay logging
src/logger.ts - DB logging failures

Created log streaming scripts:

bin/logs-dev - streams logs from dev deployments with pretty-printing
bin/logs-prod - streams logs from production deployments with pretty-printing

Both typecheck and build pass successfully. To verify locally:

Run bun run dev to see pretty-printed logs in the terminal
Use bin/logs-dev dev-api or bin/logs-prod api to stream K8s logs with pretty-printing

Edit46Read15TodoWrite7Write6Bash5Glob2

8:00 PM

Your task

First, run git status, git diff, and git log --oneline -10 to understand the current state.

Then add and commit all modified files with a descriptive message. Break the changes into multiple commits if appropriate. If there are untracked files, ask if they should be added or added to the appropriate .gitignore file. The user may also want to take over at this point, so provide an abort option as well. Always check changes for unnecessary debugging statements or logging that might have been accidentally included. Prompt the user if you find any, and offer to remove each one by one. Do not use interactive git staging (git add -p) as it does not work.

<thinking> Let me look at the full diff to check for any debugging statements or accidental logging, and also to understand the k8s changes and the student-selection changes which were not part of the logging plan. </thinking> <thinking> I see there are some pre-existing changes in the working directory that are not related to the Pino logging implementation: 1. k8s/*.yaml files - adding TZ environment variable 2. tools/student-selection/src/load-applications.ts - CLI argument changes

These were already modified before my work started. Let me also check the untracked files:

bin/db-query-dev and bin/db-query-prod - these were mentioned in the git status at the start
bin/logs-dev and bin/logs-prod - these are from the logging implementation
packages/logger/ - this is from the logging implementation

Let me look at the db-query scripts to see what they are. </thinking>

<thinking> I see there are several changes here: 1. **Pino logging** (my work): - `packages/logger/` - new package - `apps/api/package.json` and all the `apps/api/src/*.ts` files - `apps/mail/package.json` and all the `apps/mail/src/*.ts` files - `bin/logs-dev` and `bin/logs-prod` - `bun.lock`

Pre-existing changes (not from my work):
- k8s/*.yaml files - adding TZ environment variable
- tools/student-selection/src/load-applications.ts - CLI argument changes
- bin/db-query-dev and bin/db-query-prod - database query scripts (untracked)

I should ask the user how they want to handle this - whether to commit everything together, break it into separate commits, or just commit the logging changes.

Let me also scan through my changes to check for any unnecessary debugging statements. </thinking>

I've reviewed all the changes. There are no unnecessary debugging statements - all the logging is appropriate production-level logging.

Here's a summary of what's in the working directory:

Logging Implementation (from this task):

packages/logger/ - new Pino logger package (untracked)
apps/api/ and apps/mail/ source files - console.* → structured logger
bin/logs-dev and bin/logs-prod - K8s log streaming scripts (untracked)
bun.lock - updated with pino dependencies

Pre-existing changes (not from logging task):

k8s/*.yaml - adding TZ environment variable
tools/student-selection/src/load-applications.ts - CLI argument changes
bin/db-query-dev and bin/db-query-prod - database query scripts (untracked)

Done. Created 3 commits:

aab5805 - Add Pino structured logging to API and mail services
fc9542b - Add TZ environment variable to K8s deployments and improve load-applications CLI
463d157 - Add database query scripts for dev and prod environments

Bash9Read2AskUserQuestion1

8:07 PM

Do you feel like we're done with the email feature and can return to the main branch?

Looking at the commit history on the email branch:

463d157 Add database query scripts for dev and prod environments
fc9542b Add TZ environment variable to K8s deployments and improve load-applications CLI
aab5805 Add Pino structured logging to API and mail services
8b5e53d Enhance email system with detail view and sender filtering
93f4e72 Add standardized subject formatting for mailing lists
57899e6 Add display names for sender and list in email headers
19ee820 Show list address in To header instead of recipient email
ef227ce Fix mail routing and add database migration tooling
6483e30 Add self-hosted mailing list system

The mailing list feature looks complete:

SMTP server receiving and processing mail
Authorization checking for senders
Recipient resolution from enrollments
Relay to external mail server
Proper list headers (List-Id, List-Post, etc.)
Subject formatting with display names
Database logging of mail activity
Admin UI for viewing mail logs
Bounce handling for unknown lists/unauthorized senders
Structured logging for production debugging

The supporting infrastructure (TZ config, db-query scripts, Pino logging) is also in place.

Do you want me to merge this into main, or is there anything else you want to test/review first?

8:21 PM

Done. OK, next we need to work on the UI on mobile, which is pretty broken overall and definitely for the homepage. What's a good way of allowing you to test this directly so that you can iterate?

Let me first check the existing plan file and then explore how the project is set up for testing.

This is the old Pino logging plan (now complete). This is a different task - fixing mobile UI. Let me explore the testing infrastructure and the homepage to understand our options.

Good exploration. I now understand:

E2E testing is Playwright-based but currently desktop-only (1280×720)
Homepage has minimal mobile optimization - no hamburger menu, floating quotes hidden, no sm: breakpoints

For testing mobile UI directly, here are the practical options:

Let me explore the syllabus and terminology pages to understand their current mobile state, then design the implementation plan.

I have all the information I need. Let me write the plan to the plan file.

Task4Read1AskUserQuestion1Write1ExitPlanMode1

Pino Structured Logging Implementation

Summary

1. Create packages/logger

File Structure

package.json

src/index.ts

2. Update apps/api

Changes to apps/api/src/index.ts

Files to Update

3. Update apps/mail

Changes to apps/mail/src/index.ts

Files to Update

4. Create Log Streaming Scripts

bin/logs-dev

bin/logs-prod

Files to Create/Modify

Implementation Order

Verification

Your task

1. Create `packages/logger`

2. Update `apps/api`

Changes to `apps/api/src/index.ts`

3. Update `apps/mail`

Changes to `apps/mail/src/index.ts`