Delete row sig_f03b39778cbe from signals

id sig_f03b39778cbe
event_id evt_43874309f7cb
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_41490f1e3 ...
dedupe_key signal_enriched:news_delta:ecd9d1145e062637
throttle_s 0
created_at 2026-04-09T00:07:15.004755+00:00
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