Delete row sig_9df40d7db267 from signals

id sig_9df40d7db267
event_id evt_40f5c35f9e27
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T15:32:21.808093+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6b769a5ff9295afb
throttle_s 0
created_at 2026-04-12T15:32:21.808093+00:00
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