Delete row sig_97faf910ce58 from signals

id sig_97faf910ce58
event_id evt_a1a94536c47c
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_aee9655ae ...
dedupe_key signal_enriched:news_delta:4439d4d5456db76f
throttle_s 0
created_at 2026-04-12T16:10:50.873966+00:00
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