Delete row sig_3c777c5fb199 from signals

id sig_3c777c5fb199
event_id evt_53efa3efdeec
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_79b2a8596 ...
dedupe_key signal_enriched:news_delta:b39cdc7739b6a432
throttle_s 0
created_at 2026-04-09T14:22:29.088859+00:00
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