Reject tagging samples outside the tag's collection, insert tag links in one query

[gabrielfruet]

What has changed and why?

A tag belongs to the collection of the samples it tags. Adding a sample from another collection, or one that does not exist, now raises ValueError, which the API returns as 400. Before, a sample from another collection was linked anyway, and an unknown id failed the foreign key with a 500.

add_sample_ids_to_tag_id writes the links with one INSERT ... SELECT, and the check counts that same query. On DuckDB, tag_assignment_benchmark.py drops from 5.9 s on main to 2.1 s for 100k samples.

Test fixtures that tagged across collections now create tags in the sample's collection. First of three: #2757 moves existing tag links to their sample's collection, #2758 removes the tag kind field.

How has it been tested?

• New resolver tests: a sample from another collection, an unknown id, duplicate ids.
• uv run pytest -n 8: the only failures are local (no s3fs or adlfs, no built webapp).
• Postgres runs in CI's test-postgres job.

Did you update CHANGELOG.md?

• Yes
• Not needed (internal change)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Breaking Changes
  • Tags now contain only samples from their own collection, and tags no longer include a kind field.
  • PostgreSQL moves cross-collection samples to same-named tags in their sample’s collection. DuckDB users must re-index before creating tags.
• Bug Fixes
  • Adding a nonexistent sample or one from another collection returns an error and leaves the tag unchanged. Adding a tag to a sample from another collection also returns an error.
• Performance
  • Adding multiple samples to a tag is faster.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-08T18:22:01.641900Z	de1fd8b	PR opened

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📝 Walkthrough

Bulk and single-sample tag assignment now validate that samples belong to the tag’s collection. Bulk addition uses a query-based insert and rejects unknown or cross-collection sample IDs. The changelog records tag collection changes and migration notes.

Changes: Tag collection validation and sample addition

Layer / File(s)	Summary
Validate and add samples in bulk lightly_studio/src/lightly_studio/resolvers/tag_resolver/add_sample_ids_to_tag_id.py, lightly_studio/tests/resolvers/tag_resolver/test_add_sample_ids_to_tag_id.py, lightly_studio/tests/conftest.py, lightly_studio/tests/resolvers/test_annotation_resolver.py, CHANGELOG.md	Bulk addition returns the tag for empty input. Otherwise, it checks that every distinct requested ID belongs to the tag’s collection, raises ValueError for unmatched IDs, and delegates insertion through a query. Tests cover mismatched collections, unknown IDs, and duplicate IDs. Test fixtures and annotation tag setup now use matching collections. The changelog documents collection-specific tags, HTTP 400 responses for mismatched or missing samples, migration behavior, and faster bulk tagging.
Validate single-sample assignment lightly_studio/src/lightly_studio/resolvers/tag_resolver/add_tag_to_sample.py, lightly_studio/tests/resolvers/tag_resolver/test_add_tag_to_sample.py	Single-sample assignment raises ValueError when the sample and tag belong to different collections. A test verifies that the rejected assignment leaves the sample without tags.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix

Suggested reviewers: michal-lightly, horatiualmasan

Merge Risk: 🔵 Low · up to 6eef0

The migration note could mislead users about what happens to existing tag links. Correct it before relying on the changelog for upgrade guidance.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 41.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 6 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly identifies the two main changes: rejecting cross-collection tagging and inserting tag links with one query.
Description check		The description covers the change, motivation, testing, known local test limitations, performance results, and changelog update.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 41.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 6 files. (1 skipped: 1 unsupported.)

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✅  Fast Track: all required checks passed — auto-approved.

Guardrail	Result	Message
frontend/complexity	✅	0 file(s) checked.
backend/complexity	✅	6 file(s) checked, no violations.
backend/coverage	✅	2 file(s) checked at 90%. [PASS] lightly_studio/src/lightly_studio/resolvers/tag_resolver/add_sample_ids_to_tag_id.py: 100.0% [PASS] lightly_studio/src/lightly_studio/resolvers/tag_resolver/add_tag_to_sample.py: 100.0%
diff-size	✅	PR adds 154 line(s) (limit: 215).
frontend/coverage	✅	0 file(s) checked.

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Reviewed commit: de1fd8ba2d

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[gabrielfruet]

/review

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Actionable comments posted: 1

---

• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @CHANGELOG.md:
- Line 15: Update the breaking-change migration note to describe the PostgreSQL
migration accurately: it consolidates same-name tags within each collection,
retains the sample tag when present, and moves links from duplicate tags to the
retained tag. Clarify that DuckDB does not run this PostgreSQL migration; remove
the claims that samples move to tags in their own collection and that DuckDB
users must re-index before creating tags.

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