Delete row sig_f2fd0b3f7e03 from signals

id sig_f2fd0b3f7e03
event_id evt_b918d20ee986
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_510ae7e8c ...
dedupe_key signal_enriched:news_delta:10200070564d116c
throttle_s 0
created_at 2026-04-16T14:00:58.233604+00:00
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