Delete row sig_dbc2515b230c from signals

id sig_dbc2515b230c
event_id evt_af770eb28cbc
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_3ac127fe5 ...
dedupe_key signal_enriched:news_delta:ee7d977c310128f2
throttle_s 0
created_at 2026-04-07T23:23:38.737138+00:00
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