Delete row sig_9dc8c684d823 from signals

id sig_9dc8c684d823
event_id evt_aea5726c8367
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_04fe094d4 ...
dedupe_key signal_enriched:news_delta:ec5a9f6e2c7a5f70
throttle_s 0
created_at 2026-04-06T17:07:36.931000+00:00
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