Delete row sig_973fc96314fd from signals

id sig_973fc96314fd
event_id evt_bdaa2a796e10
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_3e0a6d2cb ...
dedupe_key signal_enriched:news_delta:5d555430597b62d5
throttle_s 0
created_at 2026-04-08T06:51:21.967136+00:00
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