Delete row sig_1507b8c238ad from signals

id sig_1507b8c238ad
event_id evt_e75306ed90f1
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_410f358dd ...
dedupe_key signal_enriched:market_headline_delta:e0abb098a855 ...
throttle_s 0
created_at 2026-04-17T07:28:43.354386+00:00
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