Delete row sig_4614fd5d04fd from signals

id sig_4614fd5d04fd
event_id evt_0cc85cdfa879
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T10:53:59.058974+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bfc14e083cece6d8
throttle_s 0
created_at 2026-04-16T10:53:59.058974+00:00
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