Delete row sig_c0977cffafa1 from signals

id sig_c0977cffafa1
event_id evt_d5553ac67327
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_99cb801fd ...
dedupe_key signal_enriched:news_delta:10a8681731efef11
throttle_s 0
created_at 2026-04-19T12:01:23.172152+00:00
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