Delete row sig_1939a82731b1 from signals

id sig_1939a82731b1
event_id evt_bc9666f3fbab
watcher_id NULL
signal_type market_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {"_evidence_event_ids":["evt_afc3d272f ...
dedupe_key signal_enriched:market_headline_delta:1c9274f5e7f6 ...
throttle_s 0
created_at 2026-04-20T09:15:53.321594+00:00
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