Delete row sig_adb49c5c4c38 from signals

id sig_adb49c5c4c38
event_id evt_2421d5fb646b
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_6460b2755 ...
dedupe_key signal_enriched:news_delta:29fa6d1633be72ca
throttle_s 0
created_at 2026-04-18T12:19:05.202918+00:00
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