Delete row sig_776c72e2c382 from signals

id sig_776c72e2c382
event_id evt_cad9f26092b0
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_777709de8 ...
dedupe_key signal_enriched:news_delta:29e1eef36bab64db
throttle_s 0
created_at 2026-04-20T09:59:20.148401+00:00
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