Delete row sig_e1f03873b01b from signals

id sig_e1f03873b01b
event_id evt_a92682f46d69
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_8231cc86f ...
dedupe_key signal_enriched:news_delta:0ccd28ce12373d76
throttle_s 0
created_at 2026-04-19T00:02:36.051657+00:00
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