Delete row sig_8f148a02387d from signals

id sig_8f148a02387d
event_id evt_c1f306128425
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_6487afb3a ...
dedupe_key signal_enriched:news_delta:53157e3f9a003db6
throttle_s 0
created_at 2026-04-20T21:37:11.533575+00:00
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