Delete row sig_f903d04761fa from signals

id sig_f903d04761fa
event_id evt_b0b9dc7dd112
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_37b7aac81 ...
dedupe_key signal_enriched:news_delta:24375f189d088fde
throttle_s 0
created_at 2026-04-16T10:25:44.497729+00:00
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