Delete row sig_b4f540e2f3ce from signals

id sig_b4f540e2f3ce
event_id evt_9f97b5ae2f78
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_c590b03f7 ...
dedupe_key signal_enriched:news_delta:2e580617a903c70c
throttle_s 0
created_at 2026-04-10T21:57:55.030475+00:00
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