Delete row sig_43cc0903d808 from signals

id sig_43cc0903d808
event_id evt_3eb5fb4aa460
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_2ed8d079c ...
dedupe_key signal_enriched:news_delta:bdc21a8b6d67e003
throttle_s 0
created_at 2026-04-06T16:28:36.651622+00:00
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