Delete row sig_b03ffca16058 from signals

id sig_b03ffca16058
event_id evt_9f35a2bbc7bb
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_f70876c4e ...
dedupe_key signal_enriched:news_delta:577f3e638e174431
throttle_s 0
created_at 2026-04-20T21:37:11.554963+00:00
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