Delete row sig_1c943499a1c6 from signals

id sig_1c943499a1c6
event_id evt_92cd3e5f5541
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_48a4f983e ...
dedupe_key signal_enriched:news_delta:38319381e702cbfe
throttle_s 0
created_at 2026-04-08T20:43:07.856522+00:00
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