Delete row sig_2b50635fc91a from signals

id sig_2b50635fc91a
event_id evt_142802c8bc49
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_d34de3648 ...
dedupe_key signal_enriched:news_delta:8edacff98d3d96c4
throttle_s 0
created_at 2026-04-19T07:31:03.559016+00:00
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