Delete row sig_936c3a8619be from signals

id sig_936c3a8619be
event_id evt_8896cc7c50a7
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_151ecf42a ...
dedupe_key signal_enriched:news_delta:2ddd59fb0326396b
throttle_s 0
created_at 2026-04-21T00:02:03.857897+00:00
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