Delete row sig_3e3c4fac2630 from signals

id sig_3e3c4fac2630
event_id evt_88f9eaa279ab
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_bd738b20e ...
dedupe_key signal_enriched:news_delta:5abb08d16b6b2b0e
throttle_s 0
created_at 2026-04-17T17:17:12.012926+00:00
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