Delete row sig_2c18b61930c1 from signals

id sig_2c18b61930c1
event_id evt_9379771d2dcd
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_1e5128a65 ...
dedupe_key signal_enriched:news_delta:a38d3ce1e14d6fa6
throttle_s 0
created_at 2026-04-08T09:07:38.475882+00:00
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