Delete row sig_c5b821cf7938 from signals

id sig_c5b821cf7938
event_id evt_d7d406e94795
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_f28e68dc0 ...
dedupe_key signal_enriched:news_delta:4df638b018efd7ab
throttle_s 0
created_at 2026-04-09T00:58:24.023778+00:00
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