Delete row sig_02028947afe6 from signals

id sig_02028947afe6
event_id evt_c431df03fe06
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_5023fd3c6 ...
dedupe_key signal_enriched:news_delta:3d65f7bfad48e15a
throttle_s 0
created_at 2026-04-10T16:36:01.521193+00:00
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