Delete row sig_a77de0a7f60a from signals

id sig_a77de0a7f60a
event_id evt_219d5cb4cce1
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_f20acc5ca ...
dedupe_key signal_enriched:news_delta:853bf22e40a439c6
throttle_s 0
created_at 2026-04-09T23:49:35.029504+00:00
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