Delete row sig_135752190619 from signals

id sig_135752190619
event_id evt_fc8f864aa740
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_db22edb11 ...
dedupe_key signal_enriched:news_delta:63fce7e2d038ac13
throttle_s 0
created_at 2026-04-09T20:52:32.262826+00:00
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