Delete row sig_87004808c193 from signals

id sig_87004808c193
event_id evt_0ad8301bfc6d
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_9fe60a688 ...
dedupe_key signal_enriched:news_delta:a561ceb1a8d80e13
throttle_s 0
created_at 2026-04-20T14:20:31.081848+00:00
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