Delete row sig_938f86291d1c from signals

id sig_938f86291d1c
event_id evt_e0af5e8d19f5
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_4241fc10a ...
dedupe_key signal_enriched:news_delta:7fb727837ed23bd9
throttle_s 0
created_at 2026-04-07T11:15:38.983604+00:00
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