Delete row sig_3ef87de1ff70 from signals

id sig_3ef87de1ff70
event_id evt_1d98a3579d22
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T05:46:45.625163+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:dae305433a36a129
throttle_s 0
created_at 2026-04-19T05:46:45.625163+00:00
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