Delete row sig_14994151ca04 from signals

id sig_14994151ca04
event_id evt_8320466930b3
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_250395fc0 ...
dedupe_key signal_enriched:news_delta:1ef18fb72b55d58f
throttle_s 0
created_at 2026-04-18T07:30:25.619113+00:00
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