Delete row sig_1bac4fd92190 from signals

id sig_1bac4fd92190
event_id evt_b8e7aa0341ea
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_338dffb04 ...
dedupe_key signal_enriched:news_delta:093d69af3d55a637
throttle_s 0
created_at 2026-04-18T18:03:45.292488+00:00
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