Delete row sig_e15c6e47464b from signals

id sig_e15c6e47464b
event_id evt_6b5d46569688
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_0103e40fd ...
dedupe_key signal_enriched:news_delta:4033d054c3ef158d
throttle_s 0
created_at 2026-04-04T14:04:03.004238+00:00
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