Delete row sig_a3fcc9941813 from signals

id sig_a3fcc9941813
event_id evt_5bd7f165e357
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_3f95f2dd0 ...
dedupe_key signal_enriched:news_delta:fde61f4ee71abf99
throttle_s 0
created_at 2026-04-18T11:18:31.282399+00:00
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