Delete row sig_0c98b3cc24e7 from signals

id sig_0c98b3cc24e7
event_id evt_d0c085850242
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_63d1a2a20 ...
dedupe_key signal_enriched:news_delta:e09f18478b78b2b7
throttle_s 0
created_at 2026-04-19T10:31:32.964435+00:00
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