Delete row sig_4dec10f5eff7 from signals

id sig_4dec10f5eff7
event_id evt_2d19f20fa48e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T06:00:07.565454+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5f32badde1f73512
throttle_s 0
created_at 2026-04-10T06:00:07.565454+00:00
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