Delete row sig_141e1e854f38 from signals

id sig_141e1e854f38
event_id evt_71adc82b20d2
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T08:19:23.059624+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:87da968fb971182b
throttle_s 0
created_at 2026-04-22T08:19:23.059624+00:00
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