Delete row sig_4d94fd50fd27 from signals

id sig_4d94fd50fd27
event_id evt_f4e3cc59e30b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T12:41:15.938931+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:abf51850ba2ece4b
throttle_s 0
created_at 2026-04-18T12:41:15.938931+00:00
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