Delete row sig_c3e1a6948376 from signals

id sig_c3e1a6948376
event_id evt_a3aec9231149
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_408ff0b13 ...
dedupe_key signal_enriched:news_delta:5de0e8b88685a6c8
throttle_s 0
created_at 2026-04-19T06:01:08.041252+00:00
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