Delete row sig_1a0c8e2ffaad from signals

id sig_1a0c8e2ffaad
event_id evt_efcfe8a874a4
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_e34726042 ...
dedupe_key signal_enriched:news_delta:1764574a57294e4d
throttle_s 0
created_at 2026-04-22T12:32:24.955150+00:00
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