Delete row sig_198bcdbfb2a6 from signals

id sig_198bcdbfb2a6
event_id evt_46d1e90a9f85
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_cadc1a994 ...
dedupe_key signal_enriched:news_delta:82b7491dd011e7fa
throttle_s 0
created_at 2026-04-18T08:15:50.040910+00:00
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