Delete row sig_e76953e6e045 from signals

id sig_e76953e6e045
event_id evt_1776df420e4b
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_2996d7890 ...
dedupe_key signal_enriched:news_delta:99f6efd204509fc0
throttle_s 0
created_at 2026-04-09T03:57:12.008447+00:00
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