Delete row sig_c19ca5a00536 from signals

id sig_c19ca5a00536
event_id evt_35c3a70af409
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T14:08:30.645047+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:751a31bc645d599a
throttle_s 0
created_at 2026-04-11T14:08:30.645047+00:00
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