Delete row sig_16885fe0c8ed from signals

id sig_16885fe0c8ed
event_id evt_feb202970503
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_21a8c5d44 ...
dedupe_key signal_enriched:news_delta:fadd07130ad3783e
throttle_s 0
created_at 2026-04-08T21:48:34.614419+00:00
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