Delete row sig_ca6f991f0274 from signals

id sig_ca6f991f0274
event_id evt_40145488e267
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_a0abaaaf1 ...
dedupe_key signal_enriched:news_delta:9b49d1abf93f7fa8
throttle_s 0
created_at 2026-04-10T14:15:34.636652+00:00
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