Delete row sig_b53a57abfa30 from signals

id sig_b53a57abfa30
event_id evt_9d1f7c715046
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_9d8c0b018 ...
dedupe_key signal_enriched:news_delta:07e0766cf4cea60b
throttle_s 0
created_at 2026-04-21T16:42:29.537460+00:00
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