- Add Pillow dependency and thumbnail.py with generate_thumbnail() — produces
WebP ≤400px, preserves aspect ratio, never upscales, handles GIF frame 0
- Alembic migration 002 adds nullable thumbnail_key column to images table
- Upload route generates thumbnail via asyncio.to_thread (non-blocking),
stores at {hash}-thumb; failure is tolerated and upload succeeds with null key
- New GET /api/v1/images/{id}/thumbnail endpoint: serves WebP thumbnail or
falls back to original for pre-feature images; ETag + immutable cache headers
- Delete route cleans up thumbnail storage object alongside original
- Library grid switches from /file to /thumbnail for all image src bindings
- 59 tests passing (46 existing + 13 new across unit, upload, serving, delete)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Specification Quality Checklist: Upload Thumbnails
Purpose: Validate specification completeness and quality before proceeding to planning Created: 2026-05-03 Feature: spec.md
Content Quality
- No implementation details (languages, frameworks, APIs)
- Focused on user value and business needs
- Written for non-technical stakeholders
- All mandatory sections completed
Requirement Completeness
- No [NEEDS CLARIFICATION] markers remain
- Requirements are testable and unambiguous
- Success criteria are measurable
- Success criteria are technology-agnostic (no implementation details)
- All acceptance scenarios are defined
- Edge cases are identified
- Scope is clearly bounded
- Dependencies and assumptions identified
Feature Readiness
- All functional requirements have clear acceptance criteria
- User scenarios cover primary flows
- Feature meets measurable outcomes defined in Success Criteria
- No implementation details leak into specification
Notes
All checklist items pass. Spec is ready for /speckit-plan.