Delete row sig_b2c96918df76 from signals

id sig_b2c96918df76
event_id evt_1ff54058c44e
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_21f32abed ...
dedupe_key signal_enriched:news_delta:b202d38ef51c1b8c
throttle_s 0
created_at 2026-04-22T02:52:26.755994+00:00
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