Delete row sig_1e1f38733487 from signals

id sig_1e1f38733487
event_id evt_ec7a07f35c6e
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_e55c4b7c7 ...
dedupe_key signal_enriched:news_delta:48c6f81b816ead30
throttle_s 0
created_at 2026-04-20T11:31:01.245860+00:00
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