Delete row sig_3307219c6c9e from signals

id sig_3307219c6c9e
event_id evt_49e95001ba6b
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_d9a03c612 ...
dedupe_key signal_enriched:news_delta:a4b42bfa87af6038
throttle_s 0
created_at 2026-04-18T01:40:16.595799+00:00
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