Delete row sig_c3b309fb245a from signals

id sig_c3b309fb245a
event_id evt_55f286314b3b
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_fbdcd67fe ...
dedupe_key signal_enriched:news_delta:9a1748f12d8da4ca
throttle_s 0
created_at 2026-04-21T19:56:17.138258+00:00
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