Delete row sig_9e52a67903ff from signals

id sig_9e52a67903ff
event_id evt_c7b8192fca87
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_0cb0e4fde ...
dedupe_key signal_enriched:news_delta:b7f7a9c6ab620f6b
throttle_s 0
created_at 2026-04-09T13:30:33.057507+00:00
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