Delete row sig_74c998e9b043 from signals

id sig_74c998e9b043
event_id evt_2df8f6b874ff
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_1727ba372 ...
dedupe_key signal_enriched:news_delta:f862dc59204042fb
throttle_s 0
created_at 2026-04-08T03:48:36.706016+00:00
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