Delete row sig_d939a3b6d700 from signals

id sig_d939a3b6d700
event_id evt_236287f2f1a4
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_caa2f9ba0 ...
dedupe_key signal_enriched:news_delta:f8057634f87262be
throttle_s 0
created_at 2026-04-22T04:41:31.018179+00:00
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