Delete row sig_74cb86b3054e from signals

id sig_74cb86b3054e
event_id evt_c4ab001278d7
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_4e27d0aa4 ...
dedupe_key signal_enriched:news_delta:e15ee626dc93face
throttle_s 0
created_at 2026-04-20T20:05:39.004598+00:00
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