Delete row sig_e028e1c386f8 from signals

id sig_e028e1c386f8
event_id evt_ea65642018e8
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_b421ab6af ...
dedupe_key signal_enriched:news_delta:9615b6b2fcab0d65
throttle_s 0
created_at 2026-04-20T20:05:38.921221+00:00
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