Delete row sig_f679d303b510 from signals

id sig_f679d303b510
event_id evt_c77b582a13c8
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_c8a0c3744 ...
dedupe_key signal_enriched:news_delta:65d6542f2658bd5a
throttle_s 0
created_at 2026-04-21T07:00:36.854768+00:00
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