Delete row sig_b12e3729408f from signals

id sig_b12e3729408f
event_id evt_4f6486ac0229
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_18f08d16a ...
dedupe_key signal_enriched:market_headline_delta:9414b71d4214 ...
throttle_s 0
created_at 2026-04-12T23:40:24.118794+00:00
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