Delete row sig_c3fd40f2692d from signals

id sig_c3fd40f2692d
event_id evt_5de9d2c4eaee
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_c7c0f7e65 ...
dedupe_key signal_enriched:news_delta:6b4acee5783a6fdc
throttle_s 0
created_at 2026-04-19T02:09:54.706815+00:00
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