Delete row sig_4ebc06f28633 from signals

id sig_4ebc06f28633
event_id evt_e9c115944691
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_5a958cb0c ...
dedupe_key signal_enriched:news_delta:f51a280037b6f2e0
throttle_s 0
created_at 2026-04-10T04:47:24.727679+00:00
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