Delete row sig_44310c5c02cf from signals

id sig_44310c5c02cf
event_id evt_f850fcbf6fec
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T06:20:30.572563+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9e2a22acc38a8b74
throttle_s 0
created_at 2026-04-12T06:20:30.572563+00:00
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