Delete row sig_1c3576080f2d from signals

id sig_1c3576080f2d
event_id evt_3e26587f953f
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_3797ef43d ...
dedupe_key signal_enriched:news_delta:fd9d8a0f0fec8bb4
throttle_s 0
created_at 2026-04-17T16:09:34.363556+00:00
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