Delete row sig_c7361744156c from signals

id sig_c7361744156c
event_id evt_fa6f85ed02a0
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_c041159e7 ...
dedupe_key signal_enriched:news_delta:c415d4f502a0ee35
throttle_s 0
created_at 2026-04-07T11:15:38.593138+00:00
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