Delete row sig_db93bc971524 from signals

id sig_db93bc971524
event_id evt_276050add065
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_fda12a76c ...
dedupe_key signal_enriched:news_delta:2cd8cf5b72edfb1b
throttle_s 0
created_at 2026-04-09T15:51:38.076600+00:00
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