Delete row sig_3ee192ca4131 from signals

id sig_3ee192ca4131
event_id evt_b3ed65f482f2
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_03d5b7faa ...
dedupe_key signal_enriched:news_delta:cbc69dd8d977557e
throttle_s 0
created_at 2026-04-17T11:07:22.050102+00:00
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