Delete row sig_8f77362bb09f from signals

id sig_8f77362bb09f
event_id evt_247f693d66ff
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_2fb44e722 ...
dedupe_key signal_enriched:news_delta:f7ca0acde4d6514b
throttle_s 0
created_at 2026-04-16T08:54:53.150773+00:00
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