fix: drop Ticketmaster test/placeholder payloads (CCPER-*, Standalone Upsell) during import

[chubes4]

Root cause

Closes #416.

Ticketmaster's Discovery API returns test/placeholder events — internal QA records with IDs like CCPER-2756 and titles like Upcoming Event with Standalone Upsell CCPER-2756 / Upcoming Event CCPER-2756. These are Ticketmaster's own sandbox/test data leaking through the live discovery feed, and the import pipeline ingested them as real events (draft status). CCPER-2756 is a well-known Ticketmaster test event ID. These recurred on every scrape because there was no junk/test filter on the fetch path.

Filter approach

Added a vendor-agnostic JunkPayloadFilter (inc/Steps/EventImport/JunkPayloadFilter.php) and wired it into the Ticketmaster fetch loop. The matcher is generic; the junk patterns are config-driven and fully filterable via a single WordPress filter:

Filter name: data_machine_events_junk_payload_patterns

Pattern buckets (merged over defaults, all optional):

• honor_test_flag (bool) — honor an upstream explicit test flag
• id (string[]) — substring match on the source record ID
• title (string[]) — substring match on the event title
• title_prefix_no_artist (string[]) — title prefix match only when no real artist/attraction is attached

The Ticketmaster handler seeds its own defaults via register_junk_patterns() (hooked into the filter), evaluated only when $source_type === 'ticketmaster'. This satisfies layer purity: the generic matcher contains zero vendor strings; all Ticketmaster-specific junk patterns (CCPER-, Standalone Upsell, Test Event, Upcoming Event) live in the handler that owns them.

Drop rules implemented

A Ticketmaster event is dropped during fetch when any of these match:

1. The upstream test boolean flag on the raw record is true.
2. Source id contains CCPER-.
3. Title contains CCPER-, Standalone Upsell, or Test Event.
4. Title starts with Upcoming Event and the event has no real artist/attraction.

Each dropped item is logged via $context->log() (Ticketmaster: Dropped test/placeholder payload) with title/source_id/artist so the pattern table can be tuned. The matcher is placed in the shared EventImport namespace so Dice and other feeds can reuse it later; only the Ticketmaster wiring is in scope for this PR.

Site-tuning example

add_filter( 'data_machine_events_junk_payload_patterns', function ( $patterns, $source_type ) {
    if ( 'ticketmaster' !== $source_type ) {
        return $patterns;
    }
    $patterns['title'][] = 'QA Sandbox';
    return $patterns;
}, 10, 2 );

Files changed

• inc/Steps/EventImport/JunkPayloadFilter.php (new) — generic vendor-agnostic matcher with the filterable pattern table.
• inc/Steps/EventImport/Handlers/Ticketmaster/Ticketmaster.php — instantiates the filter, registers Ticketmaster default patterns via register_junk_patterns() hooked to data_machine_events_junk_payload_patterns, and drops junk in the fetch loop (is_junk_payload()), logging each drop.
• tests/Unit/JunkPayloadFilterTest.php (new) — 15 tests covering: explicit test flag (true/false/absent), CCPER- on id and title, Standalone Upsell, Test Event, Upcoming Event prefix with/without artist, normal-event pass-through, unknown-source no-match, case-insensitivity, and filterability (add a pattern + remove a default).
• tests/Unit/TicketmasterHandlerTest.php — adds tests for register_junk_patterns() (TM defaults seeded, other sources ignored), the filter exposure, and end-to-end junk/normal classification through the filter.

Test / lint results

• php -l clean on all four changed files.
• PHPStan level 7: PASSED (via homeboy lint, extension-default level 7).
• PHPUnit could not run on this host — the test sandbox (WP test setup) is unavailable in this environment. php -l is clean and the tests will run in CI.
• ESLint surfaced a JS-only infra exit (0 findings) — unrelated to this PHP change; homeboy lint overall is gated on that unrelated JS tool.

Confirms

• Patterns are filterable, not hardcoded — every junk string is registered through data_machine_events_junk_payload_patterns, and site code can add, remove, or override any bucket.
• Layer purity held — the generic matcher (JunkPayloadFilter) contains no vendor names; the only place Ticketmaster-specific strings appear is Ticketmaster::register_junk_patterns().
• No CHANGELOG.md edits, no version-string hand-bumps (homeboy owns both).

Scope

PR only. Not releasing, not deploying, not merging.

[homeboy-ci]

Homeboy Results — data-machine-events

Review audit

✅ review audit — passed

Deep dive: homeboy review audit data-machine-events --changed-since 5c270f6

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-events-review-audit-homeboy-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-events-review-audit-homeboy-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine-events/actions/runs/28749696485

Tooling versions

• Homeboy CLI: homeboy 0.281.8+15d2280a58ed+a25f89a
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 68d84557
• Action: Extra-Chill/homeboy-action@v2