Delete row sig_c9502638079c from signals

id sig_c9502638079c
event_id evt_2e12f7d80d2f
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_80e422dad ...
dedupe_key signal_enriched:news_delta:02c61a29b741dd8a
throttle_s 0
created_at 2026-04-20T19:26:44.391613+00:00
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