Delete row sig_3368ea816847 from signals

id sig_3368ea816847
event_id evt_81870ac90424
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_70d21c6ec ...
dedupe_key signal_enriched:news_delta:fad8a0b660dc697d
throttle_s 0
created_at 2026-04-21T19:56:17.266859+00:00
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