Delete row sig_d9ec1b5a9043 from signals

id sig_d9ec1b5a9043
event_id evt_516285e958b9
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_c2d714f9b ...
dedupe_key signal_enriched:news_delta:b312692bfa888c2b
throttle_s 0
created_at 2026-04-22T07:58:14.010217+00:00
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