Delete row sig_f198ac2652cf from signals

id sig_f198ac2652cf
event_id evt_f2a40a41499b
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_deedf74c3 ...
dedupe_key signal_enriched:news_delta:1287bd4e66e2172e
throttle_s 0
created_at 2026-04-09T17:20:47.076589+00:00
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