Delete row sig_c3f95df54844 from signals

id sig_c3f95df54844
event_id evt_2a5d0571bad3
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_d32b1f1b3 ...
dedupe_key signal_enriched:news_delta:19d9e4d8721b144f
throttle_s 0
created_at 2026-04-12T23:40:25.055814+00:00
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