Delete row sig_881ffb06c388 from signals

id sig_881ffb06c388
event_id evt_fe34a133e38e
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_fb9147855 ...
dedupe_key signal_enriched:news_delta:3e8658f034ab4b34
throttle_s 0
created_at 2026-04-20T23:24:22.193894+00:00
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