Delete row sig_d2b838e65488 from signals

id sig_d2b838e65488
event_id evt_0c0bd58dc9da
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_7173b83c8 ...
dedupe_key signal_enriched:news_delta:32e3b2d566b3a8c8
throttle_s 0
created_at 2026-04-18T17:12:32.423521+00:00
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