Delete row sig_6a1903d46fd3 from signals

id sig_6a1903d46fd3
event_id evt_4105b6178e7f
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T01:34:00.209866+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:43c2f5faa9f068e4
throttle_s 0
created_at 2026-04-12T01:34:00.209866+00:00
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