chore(deps): bump traefik from 3.5.3 to 3.6.5 in /compose/production/traefik

[dependabot]

Bumps traefik from 3.5.3 to 3.6.5.

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[JSv4]

@dependabot rebase

[claude]

PR Review: Traefik 3.5.3 → 3.6.5 Upgrade

Summary

This Dependabot PR updates Traefik from version 3.5.3 to 3.6.5 in the production deployment configuration. This is a minor version update that should be safe to merge.

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Code Quality ✅

• Change scope: Single-line change in compose/production/traefik/Dockerfile:1
• Simplicity: Minimal surface area for regression
• Follows conventions: Standard Dependabot pattern consistent with previous Traefik updates (see PRs Bump traefik from 3.5.2 to 3.5.3 in /compose/production/traefik #483, Bump traefik from 3.5.0 to 3.5.2 in /compose/production/traefik #478, Bump traefik from 3.4.4 to 3.5.0 in /compose/production/traefik #430, Bump traefik from 3.4.3 to 3.4.4 in /compose/production/traefik #412, Bump traefik from 3.4.0 to 3.4.3 in /compose/production/traefik #399)

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CI/Test Status ✅

All critical checks passing:

• ✅ linter - Completed successfully
• ✅ production-stack - Completed successfully (deployment validation)
• ✅ pytest - Completed successfully (28+ minutes of backend tests)
• ℹ️ CodeQL - Neutral (expected for infrastructure changes)

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Compatibility Analysis ✅

Current Traefik Configuration Review (from traefik.yml):

• Entry points: HTTP (80), HTTPS (443), Flower (5555)
• Let's Encrypt integration with HTTP challenge
• Redis-backed rate limiting (frontend: 10 req/s, API: 5 req/s, Flower: 10 req/s)
• Path-based routing for frontend, GraphQL, admin, and Flower
• CSRF middleware configuration

Compatibility Assessment:

1. Configuration syntax: No breaking changes in Traefik 3.6.x series for the features used:

   • Entry points, routers, middlewares, services syntax unchanged
   • Rate limiting configuration compatible
   • ACME/Let's Encrypt integration stable
   • Redis backend for rate limiting supported

2. Version jump context:

   • This is a minor version update (3.5 → 3.6)
   • Previous attempts to upgrade to 3.6.x (PRs chore(deps): Bump traefik from 3.5.3 to 3.6.4 in /compose/production/traefik #681, Bump traefik from 3.5.3 to 3.6.2 in /compose/production/traefik #657, Bump traefik from 3.5.3 to 3.6.1 in /compose/production/traefik #650, Bump traefik from 3.5.3 to 3.6.0 in /compose/production/traefik #647) were superseded, not rejected due to failures
   • PR chore(deps): Bump traefik from 3.5.3 to 3.6.4 in /compose/production/traefik #681 (3.6.4) passed all production tests before being superseded by this PR

3. Production deployment pattern: Existing configuration handles production requirements correctly per CLAUDE.md guidelines:

   • Migrations would run first via production.yml --profile migrate up migrate
   • No database schema changes needed for Traefik version bump
   • Traefik configuration is declarative and mounted from static files

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Security Considerations ✅

• Dependency updates are security-positive: Staying current with Traefik reduces exposure to known CVEs
• Rate limiting: Production configuration has robust Redis-backed rate limiting to prevent DoS
• TLS/ACME: Let's Encrypt integration properly configured
• No new attack surface: This is a drop-in replacement with the same exposed ports and services

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Performance Considerations ✅

• No performance regression expected: Minor version updates in Traefik typically improve performance
• Rate limiting efficiency: Redis-backed rate limiting configuration is production-grade with appropriate pool sizes and timeouts
• Connection pooling: Properly configured with minIdleConns, maxActiveConns, and timeout values

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Potential Issues ⚠️

Minor concern - Superseded PRs pattern:

• PRs chore(deps): Bump traefik from 3.5.3 to 3.6.4 in /compose/production/traefik #681 (3.6.4), Bump traefik from 3.5.3 to 3.6.2 in /compose/production/traefik #657 (3.6.2), Bump traefik from 3.5.3 to 3.6.1 in /compose/production/traefik #650 (3.6.1), Bump traefik from 3.5.3 to 3.6.0 in /compose/production/traefik #647 (3.6.0) were all closed without merging
• This appears to be Dependabot's expected behavior (superseding older PRs with newer versions)
• However: This means the project has been on 3.5.3 since September 2025 (PR Bump traefik from 3.5.2 to 3.5.3 in /compose/production/traefik #483)
• Recommendation: Consider merging this PR to avoid falling further behind on security updates

No blockers identified - all tests pass and configuration is compatible.

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Test Coverage ✅

While this PR does not add new tests (infrastructure change), the existing test suite validates:

• Production stack deployment (via production-stack CI check)
• Backend functionality (via pytest - 28 minutes of tests)
• Code quality (via linter)

The production-stack test specifically validates that the Traefik service builds and integrates correctly with the rest of the production environment.

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Recommendation: APPROVE & MERGE ✅

Rationale:

1. All CI checks passing
2. Minor version update with no breaking changes
3. Configuration fully compatible
4. Reduces security exposure by staying current
5. Pattern matches successfully merged Traefik updates in the past
6. Production deployment process (migrate-first pattern from CLAUDE.md) will handle this safely

Suggested merge approach:

• Use @dependabot rebase to ensure latest base
• Then merge when CI completes

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Additional Notes

• This update skips 3.6.0-3.6.4 due to Dependabot's superseding behavior, which is normal
• No changes needed to traefik.yml configuration
• No database migrations required
• Zero downtime deployment possible (Traefik gracefully handles config reloads)