Delete row sig_2c4c89472a77 from signals

id sig_2c4c89472a77
event_id evt_3a699edc4bec
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_2b4a6378d ...
dedupe_key signal_enriched:news_delta:c0d0479e2b4f4f19
throttle_s 0
created_at 2026-04-17T02:58:03.953250+00:00
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