Delete row sig_e31714541298 from signals

id sig_e31714541298
event_id evt_2b436ce61816
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_69d7db27f ...
dedupe_key signal_enriched:news_delta:47852c97d529f2ff
throttle_s 0
created_at 2026-04-20T03:35:20.041858+00:00
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