Delete row sig_0ecb4a31e632 from signals

id sig_0ecb4a31e632
event_id evt_578fc7bf1955
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T22:21:15.960179+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1e9737a23e03f390
throttle_s 0
created_at 2026-04-10T22:21:15.960179+00:00
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