Delete row sig_4b4303cc1fbb from signals

id sig_4b4303cc1fbb
event_id evt_89c9f16d055a
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_aba1b64ee ...
dedupe_key signal_enriched:news_delta:1497861e6cf4c714
throttle_s 0
created_at 2026-04-14T08:03:13.795989+00:00
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