Delete row sig_c0c800dbd976 from signals

id sig_c0c800dbd976
event_id evt_ed48935b4b24
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T14:10:03.319856+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ff38aa160c463f0d
throttle_s 0
created_at 2026-04-10T14:10:03.319856+00:00
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