Delete row sig_d904f8d4acbd from signals

id sig_d904f8d4acbd
event_id evt_4008f5933299
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_509fbeea4 ...
dedupe_key signal_enriched:news_delta:f81f4554ab77bb92
throttle_s 0
created_at 2026-04-14T21:04:45.902360+00:00
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