Delete row sig_c376d19ad8b2 from signals

id sig_c376d19ad8b2
event_id evt_bef65aaacb14
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_db3121ce9 ...
dedupe_key signal_enriched:news_delta:24e7cfde923d902e
throttle_s 0
created_at 2026-04-20T00:17:33.096152+00:00
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