Delete row sig_1ad03279e4c3 from signals

id sig_1ad03279e4c3
event_id evt_f086394ff5fe
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T14:53:50.385838+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0e656753445ef3f7
throttle_s 0
created_at 2026-04-07T14:53:50.385838+00:00
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