Delete row sig_1077c3bdbedc from signals

id sig_1077c3bdbedc
event_id evt_36451d59bde2
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_bf2ba42dd ...
dedupe_key signal_enriched:news_delta:bc771e049f66944f
throttle_s 0
created_at 2026-04-20T14:20:31.045936+00:00
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