Delete row sig_77d669796b02 from signals

id sig_77d669796b02
event_id evt_8a452f0c1ec5
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_3fd175728 ...
dedupe_key signal_enriched:news_delta:2ff3d2c071206dc8
throttle_s 0
created_at 2026-04-06T21:50:13.222547+00:00
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