Delete row sig_776879921063 from signals

id sig_776879921063
event_id evt_b852345e4bd5
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_f3cfee83c ...
dedupe_key signal_enriched:news_delta:c0ab779472bdf813
throttle_s 0
created_at 2026-04-18T07:45:38.592603+00:00
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