Delete row sig_189cca3f49f3 from signals

id sig_189cca3f49f3
event_id evt_1f62f480010e
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_c20af3728 ...
dedupe_key signal_enriched:news_delta:da682ee7495d78dc
throttle_s 0
created_at 2026-04-20T16:27:42.381596+00:00
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