Delete row sig_d4c5b7d14c99 from signals

id sig_d4c5b7d14c99
event_id evt_c57b88b52410
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_e276e6b54 ...
dedupe_key signal_enriched:news_delta:dda172649842a2e0
throttle_s 0
created_at 2026-04-20T22:09:15.880252+00:00
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