Delete row sig_ca2effa12b9b from signals

id sig_ca2effa12b9b
event_id evt_b76082e4003f
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_bf1be1843 ...
dedupe_key signal_enriched:news_delta:5ebeb039d77e4380
throttle_s 0
created_at 2026-04-16T18:14:32.775621+00:00
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