Delete row sig_97f3cf8ab55c from signals

id sig_97f3cf8ab55c
event_id evt_2e62871b5be5
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_e06e96563 ...
dedupe_key signal_enriched:news_delta:ee4a4184a868a356
throttle_s 0
created_at 2026-04-11T15:01:43.861813+00:00
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