Delete row sig_5b15e991d00b from signals

id sig_5b15e991d00b
event_id evt_e453103bee34
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_b8a20c855 ...
dedupe_key signal_enriched:news_delta:1ed5800b0b1c976c
throttle_s 0
created_at 2026-04-19T23:32:01.774423+00:00
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