Delete row sig_e74106351488 from signals

id sig_e74106351488
event_id evt_dce8b21995c9
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_e5f9a36c6 ...
dedupe_key signal_enriched:news_delta:15bd92fb768235e2
throttle_s 0
created_at 2026-04-10T01:08:30.499224+00:00
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