Delete row sig_0194ecb24514 from signals

id sig_0194ecb24514
event_id evt_c471d7695163
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_91be64bb9 ...
dedupe_key signal_enriched:news_delta:752d576275408767
throttle_s 0
created_at 2026-04-09T00:58:19.365786+00:00
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