Deduplicate exchanged content

[eilmiv]

Summary of changes

• Store the source a resource was ingested from
• Don't update resource from a different source unless metadata is better

Motivation and context

Closes #1356

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.

[Copilot]

Pull request overview

This PR addresses metadata “flip-flopping” during ingestion by recording which Source last scraped a Scrapable resource and introducing logic to skip updates from other sources unless the incoming metadata is deemed richer. This aligns with issue #1356’s goal of stabilizing metadata when multiple sources provide conflicting versions.

Changes:

• Add last_scraped_by_id to events and materials, and expose it via Scrapable#last_scraped_by_source.
• Update the ingestor to persist last_scraped_by_source and to skip writes when the current source is not responsible.
• Add/adjust unit tests and fixtures to cover responsibility switching behavior.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
lib/ingestors/ingestor.rb	Sets last_scraped_by_source on ingest and introduces responsibility logic to avoid cross-source flip-flops.
app/models/concerns/scrapable.rb	Adds the belongs_to :last_scraped_by_source association for scrapable models.
db/migrate/20260729120000_add_last_scraped_by_to_scrapable_models.rb	Adds the new DB columns for tracking scrape source.
db/schema.rb	Reflects the new last_scraped_by_id columns in events and materials.
test/unit/ingestors/ingestor_test.rb	Adds tests for setting and switching scrape-source responsibility.
test/fixtures/events.yml	Adds an event fixture used by the new responsibility tests.
test/unit/ingestors/scraper_test.rb	Updates expected activity count impacted by the new ingestion behavior.

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