Delete row sig_993feaff622f from signals

id sig_993feaff622f
event_id evt_b0274041a56f
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_c4dde5976 ...
dedupe_key signal_enriched:news_delta:a1097fe4c67e45b2
throttle_s 0
created_at 2026-04-08T02:29:41.145862+00:00
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