Delete row sig_3fccff591627 from signals

id sig_3fccff591627
event_id evt_d26bfd36bec2
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_0c7ecde54 ...
dedupe_key signal_enriched:market_headline_delta:9d8088c66495 ...
throttle_s 0
created_at 2026-04-12T11:16:26.397275+00:00
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