Delete row sig_6300548f5029 from signals

id sig_6300548f5029
event_id evt_62b9eacfcc17
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_35992df86 ...
dedupe_key signal_enriched:news_delta:5dcbcebd8776a85a
throttle_s 0
created_at 2026-04-09T11:22:54.942798+00:00
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