Delete row sig_1575528c8b47 from signals

id sig_1575528c8b47
event_id evt_158e3bf2e53a
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_d71f3924c ...
dedupe_key signal_enriched:market_headline_delta:463aa9162295 ...
throttle_s 0
created_at 2026-04-19T01:31:57.528326+00:00
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