Delete row sig_02074098463b from signals

id sig_02074098463b
event_id evt_5f4f388c1381
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_597f0070b ...
dedupe_key signal_enriched:news_delta:19d23fae027f5ceb
throttle_s 0
created_at 2026-04-20T09:28:58.535898+00:00
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