Delete row sig_1c5c18aca4f3 from signals

id sig_1c5c18aca4f3
event_id evt_1532084de52e
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_d4962c4b0 ...
dedupe_key signal_enriched:news_delta:7c90c29174656871
throttle_s 0
created_at 2026-04-11T11:23:44.022306+00:00
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