Delete row sig_5f3407fa091c from signals

id sig_5f3407fa091c
event_id evt_d294904da233
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_491fa7a4e ...
dedupe_key signal_enriched:news_delta:f9f2b891a1b3c351
throttle_s 0
created_at 2026-04-09T01:37:46.634655+00:00
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