Delete row sig_c5bc838199bc from signals

id sig_c5bc838199bc
event_id evt_3e4d30e6dded
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_f994265f7 ...
dedupe_key signal_enriched:news_delta:f59fd7e1c227f28d
throttle_s 0
created_at 2026-04-20T03:20:08.820646+00:00
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