Delete row sig_4fe8186805b2 from signals

id sig_4fe8186805b2
event_id evt_23346c7f4728
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T11:53:10.850278+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:01bd62163c24adb1
throttle_s 0
created_at 2026-04-07T11:53:10.850278+00:00
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