feat: add Winston logging and Sarvam fallback provider

[kaihere14]

Replace all 115 console.* calls with a tagged Winston logger and
finish
wiring Sarvam as the fallback provider across every LLM path.

Logging (src/utils/logger.js):

• One base logger with tagged children: server, github, ai, worker, queue, db, auth, email, convex, redis. The tag identifies the subsystem, so call sites no longer hand-write "[LLM]"-style prefixes into their messages.
• AI lines carry the provider as a field (ai:Gemini, ai:Sarvam), so a fallback run reads as one provider failing and the other succeeding.
• Structured meta instead of interpolated prose: repo, commit, path, provider, durationMs, status.
• Readable lines in development, JSON in production, level via LOG_LEVEL.
• Log uncaught exceptions and unhandled rejections.
• Add per-request logging middleware (method, url, status, duration).
• Drop the full completion dump in ai.sdk.js to debug level; it was printing every generated README to stdout.

Sarvam fallback:

• Route every Sarvam call through one method that checks for the API key, logs duration and failures, and rejects empty responses.
• Add cleanup() to SarvamProvider and fall back in LlmService.cleanup().
• Pass a fallback provider into the patch pipeline, which previously had none and failed the run outright when Gemini was exhausted.
• Log the reason on every fallback; the catch blocks were swallowing it.

Live updates:

• Rewrite the Convex live-update copy shown in the frontend: no vendor names, no internal mode jargon, present-tense steps.
• Fire the patch pipeline's "rewriting sections" update before the model call rather than after it.

Summary by CodeRabbit

• New Features

  • Added structured, contextual logging across server operations, including requests, authentication, database connections, email, GitHub, AI providers, queues, and background jobs.
  • Added request logging with response status and duration details.
  • Added environment-aware log formatting, levels, and exception handling.

• Bug Fixes

  • Improved visibility into errors and warnings without changing request handling or application behavior.

[vercel]

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Project	Deployment	Actions	Updated
daemon-doc	Ready	Preview	Sep 8, 2026 9:56am UTC

1 Skipped Deployment

Project	Deployment	Actions	Updated
read-it	Skipped		Sep 8, 2026 9:56am UTC

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 9a246a8e-4cbd-452b-affc-12a7d8d23009

📥 Commits

Reviewing files that changed from the base of the PR and between 2d4ee50 and c2e70ac.

⛔ Files ignored due to path filters (1)

• server/pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (18)

• server/package.json
• server/src/controllers/email.controller.js
• server/src/controllers/github.controller.js
• server/src/controllers/oauthcontroller.js
• server/src/db/connectDB.js
• server/src/index.js
• server/src/llm/ai.sdk.js
• server/src/llm/llm.service.js
• server/src/llm/providers/gemini.provider.js
• server/src/llm/providers/sarvam.provider.js
• server/src/llm/readme.generate.js
• server/src/llm/readme.patch.js
• server/src/middlewares/auth.middleware.js
• server/src/services/convex.service.js
• server/src/services/email.queue.js
• server/src/services/github.service.js
• server/src/utils/git.worker.js
• server/src/utils/logger.js

---

📝 Walkthrough

Walkthrough

The server adds Winston-based structured logging with tagged subsystem and provider loggers. It replaces console output across HTTP requests, integrations, AI workflows, repository workers, startup, error handling, and background processing.

Changes

Structured logging rollout

Layer / File(s)	Summary
Logger foundation and request middleware server/package.json, server/src/utils/logger.js	Adds Winston, tagged loggers, metadata formatting, environment-specific output, exception handling, and completed-request logging middleware.
Application and integration logging server/src/index.js, server/src/db/connectDB.js, server/src/middlewares/auth.middleware.js, server/src/controllers/oauthcontroller.js, server/src/controllers/email.controller.js, server/src/services/email.queue.js, server/src/services/convex.service.js	Replaces console output with structured logs for startup, database, authentication, OAuth, email, queue, and Convex operations.
GitHub controller and service logging server/src/controllers/github.controller.js, server/src/services/github.service.js	Adds contextual logs for repository access, webhooks, analytics, cleanup, file operations, and commits.
AI pipeline logging server/src/llm/ai.sdk.js, server/src/llm/llm.service.js, server/src/llm/providers/*, server/src/llm/readme.generate.js, server/src/llm/readme.patch.js	Adds provider-aware logs for generation modes, fallbacks, context analysis, README generation, patching, and completion metrics.
Repository worker logging server/src/utils/git.worker.js	Adds structured logs for Redis lifecycle events, repository scans, README updates, commits, cleanup, and failures.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant Express
  participant requestLogger
  participant RouteHandler
  participant serverLog
  Client->>Express: send HTTP request
  Express->>requestLogger: enter middleware
  requestLogger->>RouteHandler: call next()
  RouteHandler->>serverLog: log application event
  RouteHandler-->>Express: return response
  Express-->>requestLogger: complete response
  requestLogger->>serverLog: log status and duration

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✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/structured-logging-and-sarvam-fallback

---

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