Delete row sig_d77f77de9981 from signals

id sig_d77f77de9981
event_id evt_aead46385c42
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_b1d5628c0 ...
dedupe_key signal_enriched:news_delta:83d6fadf48c4d93b
throttle_s 0
created_at 2026-04-13T01:48:35.853892+00:00
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